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Masaya Shigeta

Section

Graduate School of Engineering

Job title

Professor

Degree

researchmap

https://researchmap.jp/20140415

J-GLOBAL ID

201801020552247204

Profile

東北大学教授
イタリアボローニャ大学客員教授 (兼任2010)
アメリカカリフォルニア大学バークレー校客員研究員 (兼任2012)
文部科学大臣表彰若手科学者賞受賞 (2014)
ゴードン研究会議招待講演者 (2014)
ＥＵ国家間プロジェクトHorizon2020外部アドバイザー (2015-2018)
International Plasma Chemistry Society, Board of Directors (2019-2027)
日本学術振興会第153委員会委員 (2021-2023)
日本学術振興会 DXプラズマプロセス委員会企画運営委員 (2023-)

Committee Memberships 42

(独)日本学術振興会　R052DXプラズマプロセス委員会企画運営委員（幹事）

2024/04 - Present
International Plasma Chemistry Society　Board of Directors

2019/06 - Present
International Institute of Welding　Principal Reviewer, Welding in the World

2017/10 - Present
日本学術振興会　プラズマ材料科学第153委員会委員

2021/04 - 2023/03
(一社)日本機械学会流体工学部門　第19回流れの夢コンテスト実行委員会委員長

2021/04 - 2022/03
European Union (EU)　External Advisory Board on European Union’s Horizon 2020 Research and Innovation Programme

2015/09 - 2018/09
(一財)青葉工学振興会　理事

2025/05 - Present
(独)日本学術振興会　R052DXプラズマプロセス委員会企画運営委員

2023/04 - Present
(一社)溶接学会　査読委員会第一部門部門長

2022/04 - Present
(独)日本学術振興会　科学研究費専門委員

2020/04 - Present
(一社)溶接学会　溶接法研究委員会幹事

2018/02 - Present
(一社)溶接学会　査読委員会委員, 第１領域主査

2014/06 - Present
(一社)溶接学会　2026・2027年度代議員

2024/03 - 2028/02
(一社)日本機械学会　代表会員2025・2026年度（第103・104期）

2025/09 - 2027/09
日本混相流学会　2025・2026年度評議員

2025/08 - 2027/09
(一社)日本流体力学会　代議員 (第33・34期)

2025/04 - 2027/03
(公社)日本伝熱学会東北支部　副支部長（企画）

2024/05 - 2026/05
(一社)日本機械学会流体工学部門　運営委員会委員

2024/04 - 2026/03
(一社)溶接学会東北支部　商議員

2024/03 - 2026/02
日本流体力学会年会2024実行委員会　副委員長

2023/05 - 2024/09
(一社)日本溶接協会　学識委員

2022/10 - 2024/09
応用物理学会　プラズマエレクトロニクス分科会アカデミック・ロードマップ (2)モデリング・シミュレーション副査

2023/01 - 2024/03
(一社)溶接学会　代議員

2022/04 - 2024/03
(一社)溶接学会東北支部　商議員

2022/03 - 2024/02
(一社)日本機械学会東北支部　企画担当幹事

2022/04 - 2023/03
(一社)日本流体力学会　代議員

2021/04 - 2023/03
(一社)日本機械学会東北支部　商議員

2022/03 - 2023/02
(一社)スマートプロセス学会　総合企画運営委員会委員

2018/04 - 2022/05
(一社)スマートプロセス学会　学術企画運営委員会委員

2018/04 - 2022/05
(一社)スマートプロセス学会　編集委員会委員

2018/04 - 2021/04
(一社)日本機械学会流体工学部門　Web講演会タスクフォース幹事

2020/05 - 2021/03
(一社)日本機械学会流体工学部門　技術委員会・講演会WG 幹事

2020/04 - 2021/03
(一社)溶接学会　全国大会運営委員会委員

2014/06 - 2021/03
(一社)溶接学会関西支部　幹事

2018/05 - 2020/05
(一社)日本流体力学会　代議員

2018/04 - 2020/03
(一社)日本機械学会流体工学部門　広報委員会委員

2013/04 - 2020/03
文部科学省科学技術・学術政策研究所科学技術予測センター　専門調査員

2017/04 - 2019/03
(一社)溶接学会関西支部　監事

2016/05 - 2018/05
(公社)応用物理学会　プラズマエレクトロニクス分科会幹事

2016/04 - 2018/03
(一社)溶接学会　溶接法研究委員会委嘱委員

2014/06 - 2018/02
(一社)溶接学会関西支部　副支部長・事務局長

2014/05 - 2016/05
(一社)日本機械学会　論文校閲委員会委員

2012/04 - 2014/03

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Research Areas 1

Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Fluid engineering /

Awards 30

プラズマ材料科学賞奨励部門賞

2019/01　日本学術振興会プラズマ材料科学第153委員会　熱プラズマの流動解析アルゴリズムの研究
平成26年度科学技術分野の文部科学大臣表彰若手科学者賞

2014/04　文部科学省　プラズマ熱流動場におけるナノ粒子群形成メカニズムの研究
溶接アーク物理研究賞

2025/08　溶接学会溶接法研究委員会　パルスティグ溶接における長い突出し陰極表面での渦生成メカニズムとシールド域への酸素混入に及ぼすその役割
軽金属溶接技術賞

2024/06　軽金属溶接協会　大気圧アルゴンアークプラズマのゆらぎと溶接ヒューム粒子成長・輸送の相関に関する数値解析的研究
溶接技術奨励賞

2024/05　溶接学会東北支部
溶接物理・技術奨励賞

2023/08　溶接学会溶接法研究委員会　交流ティグ溶接における電極の液滴飛散を支配する因子の検討
溶接物理・技術奨励賞

2022/08　溶接学会溶接法研究委員会　三次元粒子法シミュレーションによるマグ溶接中のスラグ輸送過程の支配因子の調査
溶接学会論文賞

2022/04　溶接学会　エレクトロスラグ溶接におけるスラグ浴内現象の観察
貢献表彰

2021/11　日本機械学会流体工学部門
溶接物理・技術奨励賞

2021/08　（一社）溶接学会溶接法研究委員会　フラックスコアードアーク溶接におけるフラックス柱形成を伴う溶滴移行の三次元粒子法シミュレーション
溶接物理・技術奨励賞

2021/08　（一社）溶接学会溶接法研究委員会　ティグ溶接における電極近傍の発光領域と電極消耗の関係
Best Paper Award of Japan Welding Society

2021/04　Japan Welding Society　Effect of shielding gas composition on gas metal arc welding phenomena using rare earth metal added wire
溶接アーク物理研究賞

2020/08　（一社）溶接学会溶接法研究委員会　フラックスコアードアーク溶接のモデル化および溶滴離脱メカニズムの数値解析的研究
溶接物理・技術奨励賞

2020/08　（一社）溶接学会溶接法研究委員会　極狭開先サブマージアーク溶接における適正施工条件の検討
溶接物理・技術奨励賞

2020/08　（一社）溶接学会溶接法研究委員会　ティグ溶接中に発生する金属蒸気を考慮した電極消耗メカニズムの実験的検討
溶接物理・技術奨励賞

2019/08　（一社）溶接学会溶接法研究委員会　ティグ溶接におけるアークプラズマのゆらぎとヒューム粒子群の成長・輸送過程の相関に関する数値解析的研究
溶接物理・技術奨励賞

2019/08　（一社）溶接学会溶接法研究委員会　非圧縮性SPH法と離散要素法を用いたサブマージアーク溶接現象の数値解析
溶接アーク物理研究賞

2018/08　溶接学会溶接法研究委員会　REM添加ワイヤを用いたGMA溶接におけるアークプラズマ現象
軽金属溶接論文賞

2018/06　軽金属溶接協会　アルミニウム溶接における狭窄ティグアークの熱源特性解析
大阪大学賞（若手教員部門）

2017/11　大阪大学
Thermal Engineering Best Paper Award

2016/08　Numerical Analysis of Convective Transfer of Nanopowder Generated around a Turbulent-Like Thermal Plasma Jet
溶接物理・技術奨励賞

2016/08　（一社）溶接学会溶接法研究委員会　被覆アーク溶接におけるアーク特性の定量評価
溶接学会論文賞

2016/04　溶接学会　画像分光法によるガスメタルアーク溶接における動的プラズマ挙動の解析
溶接アーク物理研究賞

2015/08　溶接学会溶接法研究委員会　ガスメタルアーク溶接の溶滴移行現象に及ぼすプラズマ状態の影響
Osaka University Presidential Awards for Encouragement

2015/07　Osaka University
Award for Encouragement of Research

2014/09　The IUMRS International Conference in Asia 2014　Fluid-dynamic simulation of growing nanoparticle transport in plasma synthesis
Best Paper Award

2010/11　The International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation 2010　Three-dimensional simulation of a flow in an arc weld pool by SPH method
Outstanding Paper Award of Journal of Chemical Engineering of Japan 2006

2007/03　Numerical Investigation of Local Oxygen Injection Effect on Argon Induction Plasmas Using a Chemically Non-Equilibrium Model
日本機械学会奨励賞（研究）

2005/04　日本機械学会　数値シミュレーションを用いた高機能プラズマ流によるマイクロ・ナノ粒子創製の研究
年会講演会2003 学生優秀講演賞

2003/09　日本混相流学会　高周波誘導プラズマ流によるナノ粒子創製の数値解析

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Papers 231

Turbulent self-quenching mechanism of high-temperature-gradient arc plasma in a converging–diverging cylinder: a numerical study Peer-reviewed

Masaya Shigeta, Yuki Inada, Yasunori Tanaka

International Journal of Heat and Mass Transfer　250　127291-127291　2025/11
Publisher: Elsevier BV
DOI： 10.1016/j.ijheatmasstransfer.2025.127291 　

ISSN： 0017-9310
Progress of computational plasma fluid mechanics Invited Peer-reviewed

Masaya SHIGETA

Japanese Journal of Applied Physics　62　SL0801　2023/05/25
Publisher: IOP Publishing
DOI： 10.35848/1347-4065/acd8c2 　

ISSN： 0021-4922

eISSN： 1347-4065

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Abstract This article reviews and discusses the recent progresses of studies with the concept of “Computational plasma fluid mechanics”. Computational demonstrations show that the inhouse simulation codes such as PLASTIPC (PLasma All-Speed Turbulence with Implicit Pressure Code) have captured hydrodynamic instabilities and reproduced flow dynamics in thermal plasma – nonionized gas coexisting systems. A unique method has made it feasible to study collective growth of binary alloy nanoparticles by numerical analysis. SPH (Smoothed Particle Hydrodynamics) method with incompressibility modification has achieved complex behaviors of molten metal involving phase change, flow, heat transport, material mixing, and large deformation during arc welding. It is essential to study thermal plasma processes as comprehensive fluid systems in which hot plasma, cold nonionized gas, and materials coexist. The viewpoint and approaches of fluid mechanics as well as plasma physics are indispensable. Computational study will play a more important role in giving us new and deeper insights.
Numerical Investigation of Heat Transfer During Submerged Arc Welding Phenomena by Coupled DEM-ISPH Simulation International-coauthorship Peer-reviewed

Hisaya Komen, Masaya Shigeta, Manabu Tanaka, Yohei Abe, Takahiro Fujimoto, Mitsuyoshi Nakatani, Anthony B. Murphy

International Journal of Heat and Mass Transfer　171　121062(15 pages)-121062　2021/02
Publisher: Elsevier BV
DOI： 10.1016/j.ijheatmasstransfer.2021.121062 　

ISSN： 0017-9310
Investigation of transient metal vapour transport processes in helium arc welding by imaging spectroscopy International-coauthorship Peer-reviewed

Keigo Tanaka, Masaya Shigeta, Manabu Tanaka, Anthony B. Murphy

Journal of Physics D: Applied Physics　53　(42)　425202(8 pages)　2020/07

DOI： 10.1088/1361-6463/ab9ce4 　
Simulating Turbulent Thermal Plasma Flows for Nanopowder Fabrication Invited Peer-reviewed

Masaya Shigeta

Plasma Chemistry and Plasma Processing　40　775-794　2020/01
Publisher: Springer US
DOI： 10.1007/s11090-020-10060-8 　
Modeling and simulation of a turbulent-like thermal plasma jet for nanopowder production Invited Peer-reviewed

Masaya Shigeta

IEEJ Transactions on Electrical and Electronic Engineering　14　(1)　16-28　2019/01
Publisher: Wiley
DOI： 10.1002/tee.22761 　

ISSN： 1931-4973

eISSN： 1931-4981
Turbulence modelling of thermal plasma flows Peer-reviewed

Masaya Shigeta

JOURNAL OF PHYSICS D-APPLIED PHYSICS　49　(49)　2016/12

DOI： 10.1088/0022-3727/49/49/493001 　

ISSN： 0022-3727

eISSN： 1361-6463
Three-dimensional flow dynamics of an argon RF plasma with dc jet assistance: A numerical study Peer-reviewed

Masaya Shigeta

Journal of Physics D: Applied Physics　46　(1)　2013/01/09

DOI： 10.1088/0022-3727/46/1/015401 　

ISSN： 0022-3727 1361-6463
Time-dependent 3D simulation of an argon RF inductively coupled thermal plasma Peer-reviewed

Masaya Shigeta

PLASMA SOURCES SCIENCE & TECHNOLOGY　21　(5)　2012/10

DOI： 10.1088/0963-0252/21/5/055029 　

ISSN： 0963-0252
Thermal plasmas for nanofabrication Peer-reviewed

Masaya Shigeta, Anthony B. Murphy

JOURNAL OF PHYSICS D-APPLIED PHYSICS　44　(17)　2011/05

DOI： 10.1088/0022-3727/44/17/174025 　

ISSN： 0022-3727

eISSN： 1361-6463
Growth model of binary alloy nanopowders for thermal plasma synthesis Peer-reviewed

Masaya Shigeta, Takayuki Watanabe

JOURNAL OF APPLIED PHYSICS　108　(4)　2010/08

DOI： 10.1063/1.3464228 　

ISSN： 0021-8979
A Compact-Stencil Wetting Boundary Condition for Three-Dimensional Curved Surfaces in a Phase-Field Lattice Boltzmann Method Invited Peer-reviewed

Makoto Sugimoto, Masayuki Kaneda, Kazuhiko Suga, Masaya Shigeta

Fluids　11　(3)　79-79　2026/03/14
Publisher: MDPI AG
DOI： 10.3390/fluids11030079 　

eISSN： 2311-5521

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Accurate numerical reproduction of contact line dynamics on three-dimensional curved solid surfaces remains a challenging issue in multiphase flow simulations. In this study, a wetting boundary condition applicable to curved surfaces is developed within a three-dimensional phase-field lattice Boltzmann framework. The proposed method extends an existing curved-surface wetting model and focuses on improving the evaluation of interface normals and order-parameter gradients on Cartesian lattices, while preserving the compact computational stencils and efficiency inherent to the lattice Boltzmann method. Three-dimensional simulations of liquid spreading on a concave spherical surface and droplet spreading on a convex solid sphere are performed over a wide range of prescribed contact angles. The results show that the proposed method eliminates nonphysical behaviors observed with conventional staircase-based boundary conditions, such as droplet sliding along the solid surface and droplet detachment into the surrounding gas phase. In the convex spherical surface cases, the droplet height converges stably to equilibrium through damped oscillations, and the equilibrium droplet shapes show good agreement with theoretical predictions derived from geometric considerations under zero-gravity conditions over a broad range of contact angles. These results demonstrate that the proposed wetting boundary condition can accurately reproduce wetting phenomena on three-dimensional curved solid surfaces.
SPH Simulation of Molten-Fluid Flows with a Plastic Surface Skin: A Lava-Flow-Oriented Model Study Invited Peer-reviewed

Shingo Tomita, Takuma Sato, Satoshi Murakami, Joe Yoshikawa, Makoto Sugimoto, Hisaya Komen, Masaya Shigeta

Applied Sciences　16　(4)　1716-1716　2026/02/09
Publisher: MDPI AG
DOI： 10.3390/app16041716 　

eISSN： 2076-3417

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Lava flows represent complex thermofluid phenomena in which surface cooling leads to the formation of a solidified surface layer. Understanding the influence of such a surface layer on fluid flow is an important issue in lava flow modeling. It also shares essential characteristics with a wide range of engineering problems involving surface solidification. However, the role of plastic surface skin in controlling flow deceleration and stopping behavior has not been sufficiently clarified in existing models. In this study, two-dimensional smoothed particle hydrodynamics (SPH) simulations were conducted to investigate the influence of surface skin formation on lava flow dynamics. The temperature dependence of viscosity was introduced to reproduce a plastic surface skin. The skin was represented as a low-temperature, high-viscosity region. Comparisons with simulations without surface skin formation demonstrated that the surface skin exhibits a suppressive effect on the flow. This behavior was consistent with qualitative observations of flowing lava. It was also found that this surface skin caused the successive deceleration characteristic in Bingham fluids. As a result, both the flow velocity and the flowing distance are affected. These results suggest that accurate lava flow simulations require models that incorporate both surface skin effects and non-Newtonian behavior.
Nanosized Anisotropic Sm–Fe–N Particles with Metastable TbCu7-Type Structures Prepared by an Induction Thermal Plasma Process Peer-reviewed

Yusuke Hirayama, Jian Wang, Masaya Shigeta, Shunsuke Tsurumi, Makoto Sugimoto, Zheng Liu, Kenta Takagi, Kimihiro Ozaki

Nanomaterials　15　(13)　1045-1045　2025/07/05
Publisher: MDPI AG
DOI： 10.3390/nano15131045 　

eISSN： 2079-4991

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TbCu7-type Sm-based compounds can be produced in bulk and potentially surpass Nd2Fe14B as permanent magnets. However, as the processes to prepare anisotropic magnetic particles are limited, the full potential of TbCu7-type Sm-based compounds cannot be exploited. In this study, metastable TbCu7-type phases of anisotropic Sm–Fe–N ultrafine particles were prepared using the low-oxygen induction thermal plasma (LO-ITP) process. X-ray diffraction analysis revealed that the obtained TbCu7-type Sm–Fe alloy nanoparticles exhibited a c/a value of 0.8419, with an Fe/Sm atomic ratio of ~8.5. After nitrogenation, the obtained Sm–Fe–N nanoparticles were aligned under an external magnetic field, indicating that each alloy particle exhibited anisotropic magnetic properties. A substantially high degree of alignment of 91 ± 2% was achieved, quantitatively estimated via pole figure measurements. Numerical analysis following Sm–Fe nanoparticle formation showed that, compared with Fe condensation, Sm condensation persisted even at low temperatures, because of a significant difference in vapor pressure between Sm and Fe. Though this led to a relatively large compositional distribution of Sm within particles with a Sm concentration of 9–12 at%, the preparation of single-phase TbCu7-type Sm–Fe–N particles could be facilitated by optimizing several parameters during the LO-ITP process.
Designing nanoparticles: The role of process parameters in thermal plasma synthesis Peer-reviewed

Kwangjae Park, Yusuke Hirayama, Masaya Shigeta

Advanced Powder Technology　36　(3)　104793-104793　2025/03
Publisher: Elsevier BV
DOI： 10.1016/j.apt.2025.104793 　

ISSN： 0921-8831
SPH Simulation of Molten Metal Flow Modeling Lava Flow Phenomena with Solidification Peer-reviewed

Shingo Tomita, Joe Yoshikawa, Makoto Sugimoto, Hisaya Komen, Masaya Shigeta

Dynamics　4　(2)　287-302　2024/04/19
Publisher: MDPI AG
DOI： 10.3390/dynamics4020017 　

eISSN： 2673-8716

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Characteristic dynamics in lava flows, such as the formation processes of lava levees, toe-like tips, and overlapped structures, were reproduced successfully through numerical simulation using the smoothed particle hydrodynamics (SPH) method. Since these specific phenomena have a great influence on the flow direction of lava flows, it is indispensable to elucidate them for accurate predictions of areas where lava strikes. At the first step of this study, lava was expressed using a molten metal with known physical properties. The computational results showed that levees and toe-like tips formed at the fringe of the molten metal flowing down on a slope, which appeared for actual lava flows as well. The dynamics of an overlapped structure formation were also simulated successfully; therein, molten metal flowed down, solidified, and changed the surface shape of the slope, and the second molten metal flowed over the changed surface shape. It was concluded that the computational model developed in this study using the SPH method is applicable for simulating and clarifying lava flow phenomena.
D03-ordered Fe3Al magnetic nanopowders synthesized by low oxygen induction thermal plasma Peer-reviewed

Jian Wang, Yusuke Hirayama, Zheng Liu, Shunsuke Tsurumi, Masaya Shigeta, Makoto Sugimoto, Joe Yoshikawa, Shoichi Kumon, Kimitaka Sato

Journal of Alloys and Compounds　976　173277-173277　2024/03
Publisher: Elsevier BV
DOI： 10.1016/j.jallcom.2023.173277 　

ISSN： 0925-8388
High Performance Permanent Magnet Materials Prepared by Induction Thermal Plasma Process Invited Peer-reviewed

Yusuke HIRAYAMA, Masaya SHIGETA

Journal of Smart Processing　13　(1)　23-30　2024/01/10
Publisher: Sumart Processing Society for Minerals, Environment and Energy
DOI： 10.7791/jspmee.13.23 　

ISSN： 2186-702X

eISSN： 2187-1337
Spatial-frequency-resolved schlieren sensor for turbulence visualization in arc discharge Invited Peer-reviewed

Yuki Inada, Ryo Kikuchi, Yuichi Hirano, Yusuke Maede, Yasunori Tanaka, Yusuke Nakano, Masaya Shigeta, Takayasu Fujino, Akiko Kumada

Plasma Chemistry and Plasma Processing　2023/11/14
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s11090-023-10415-x 　

ISSN： 0272-4324

eISSN： 1572-8986
X-ray free electron laser observation of ultrafast lattice behaviour under femtosecond laser-driven shock compression in iron Peer-reviewed

Tomokazu Sano, Tomoki Matsuda, Akio Hirose, Mitsuru Ohata, Tomoyuki Terai, Tomoyuki Kakeshita, Yuichi Inubushi, Takahiro Sato, Kohei Miyanishi, Makina Yabashi, Tadashi Togashi, Kensuke Tono, Osami Sakata, Yoshinori Tange, Kazuto Arakawa, Yusuke Ito, Takuo Okuchi, Tomoko Sato, Toshimori Sekine, Tsutomu Mashimo, Nobuhiko Nakanii, Yusuke Seto, Masaya Shigeta, Takahisa Shobu, Yuji Sano, Tomonao Hosokai, Takeshi Matsuoka, Toshinori Yabuuchi, Kazuo A. Tanaka, Norimasa Ozaki, Ryosuke Kodama

Scientific Reports　13　(1)　13796　2023/08/31
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-023-40283-6 　

eISSN： 2045-2322

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Abstract Over the past century, understanding the nature of shock compression of condensed matter has been a major topic. About 20 years ago, a femtosecond laser emerged as a new shock-driver. Unlike conventional shock waves, a femtosecond laser-driven shock wave creates unique microstructures in materials. Therefore, the properties of this shock wave may be different from those of conventional shock waves. However, the lattice behaviour under femtosecond laser-driven shock compression has never been elucidated. Here we report the ultrafast lattice behaviour in iron shocked by direct irradiation of a femtosecond laser pulse, diagnosed using X-ray free electron laser diffraction. We found that the initial compression state caused by the femtosecond laser-driven shock wave is the same as that caused by conventional shock waves. We also found, for the first time experimentally, the temporal deviation of peaks of stress and strain waves predicted theoretically. Furthermore, the existence of a plastic wave peak between the stress and strain wave peaks is a new finding that has not been predicted even theoretically. Our findings will open up new avenues for designing novel materials that combine strength and toughness in a trade-off relationship.
Splashing of tungsten-based anode during arc discharge Peer-reviewed

Kenta Iida, Hisaya Komen, Masaya Shigeta, Manabu Tanaka

Scientific Reports　13　(1)　12210　2023/07/27
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-023-39274-4 　

eISSN： 2045-2322

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Abstract A unique mechanism of splashing from a tungsten-based anode was identified during arc discharge. Splashing occurred by breakoff of a liquid metal column, which elongates after a local concavity formed on the molten anode surface. Blue–violet luminescence, emitted by cerium ions originating from additives in the tungsten-based anode, was captured before the concavity formation. The surface temperature exceeded the boiling point of the additives at the time of splashing. The measured droplet speeds suggested that an electromagnetic force contributes the high-speed ejections. Energy dispersive spectrometry mapping also exhibited a remnant of the additives on the longitudinal cross-section of the anode after arc discharge. Based on these experimental facts, the mechanism of anode splashing in arc discharge was deduced as follows: bubble formation of additives at temperatures above their boiling point, bubble bursting at the surface, micro-plasma jet generation, liquid-column elongation and breakoff under an electromagnetic force, and consequent high-speed droplet ejection.
A study on convection in molten zone of aluminum alloy during Fe/Al resistance spot welding Peer-reviewed

Muneyoshi Iyota, Tomoki Matsuda, Tomokazu Sano, Masaya Shigeta, Takahisa Shobu, Hirokatsu Yumoto, Takahisa Koyama, Hiroshi Yamazaki, Yasunori Senba, Haruhiko Ohashi, Shunji Goto, Ichiro Inoue, Yujiro Hayashi, Kenji Tamasaku, Taito Osaka, Jumpei Yamada, Makina Yabashi

Journal of Manufacturing Processes　94　424-434　2023/05
Publisher: Elsevier BV
DOI： 10.1016/j.jmapro.2023.03.032 　

ISSN： 1526-6125
Identification of the Dominant Factor for Droplet Ejection from a Tungsten Electrode during AC Tungsten Inert Gas Welding by Visualisation of Electrode Phenomena Peer-reviewed

Kenta Iida, Hisaya Komen, Masaya Shigeta, Manabu Tanaka

Materials　16　(7)　2899-2899　2023/04/05
Publisher: MDPI AG
DOI： 10.3390/ma16072899 　

eISSN： 1996-1944

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Droplet ejections from a molten tungsten electrode during alternating current tungsten inert gas (AC TIG) welding were observed successfully by a high-speed video captured at 75,000 fps. The welding conditions and timings that were likely to occur were investigated. The electrode surface temperature was also measured. A crater was formed on the surface of the electrode, and a droplet ejection occurred following the separation of the tip of the ridge growing from the centre of the crater. A series of droplet ejections occurred on a time scale of approximately 0.4 ms. Our results showed that the high temperature of the electrode surface was the common factor for droplet ejections. The dominant force for droplet ejection was discussed by estimating the balance of forces acting on the molten electrode surface. The pressure due to surface tension was the largest pressure at any time during the AC cycle, which decreased in the second half of the EP period. Our findings suggest that the surface tension was the dominant force for changing the electrode shape and that droplet ejections occurred when the surface tension decreased due to the increase in the electrode surface temperature.
Particle simulation of nugget formation process during steel/aluminum alloy dissimilar resistance spot welding and thickness estimation of intermetallic compounds Peer-reviewed

Shinnosuke Chikuchi, Masaya Shigeta, Hisaya Komen, Manabu Tanaka

Welding International　36　(7)　434-442　2022/07/22
Publisher: Informa UK Limited
DOI： 10.1080/09507116.2022.2084821 　

ISSN： 0950-7116

eISSN： 1754-2138
Numerical investigation for dominant factors in slag transfer and deposition process during metal active gas welding using incompressible smoothed particle hydrodynamics method Peer-reviewed

Takamasa Fukazawa, Keigo Tanaka, Hisaya Komen, Masaya Shigeta, Manabu Tanaka, Anthony Bruce Murphy

Welding International　36　(5)　297-313　2022/04
Publisher: Informa UK Limited
DOI： 10.1080/09507116.2022.2059147 　

ISSN： 0950-7116

eISSN： 1754-2138
Spatial composition distribution of a Ni-Cu binary alloy powder in a thermal plasma process Peer-reviewed

Y. Hirayama, M. Shigeta, K. Takagi, K. Ozaki

Journal of Alloys and Compounds　898　162792-162792　2022/03
Publisher: Elsevier BV
DOI： 10.1016/j.jallcom.2021.162792 　

ISSN： 0925-8388
Experimental study on effects of gas-shielding in lap-fillet arc welding Peer-reviewed

Manabu Tanaka, Tetsuo Yamada, Masaya Shigeta, Hisaya Komen, Mitsugi Fukahori, Naoko Saito

Welding International　35　(10-12)　492-507　2021/12/02
Publisher: Informa UK Limited
DOI： 10.1080/09507116.2021.1980296 　

ISSN： 0950-7116

eISSN： 1754-2138
Dross Formation Process During Gas Cutting Using Three-Dimensional Particle Simulation Peer-reviewed

H. Komen, T. Sugai, M. Shigeta, M. Tanaka, T. Kato, Y. Kitamura, T. Sato

Journal of Smart Processing　10　(6)　373-381　2021/11
Anisotropic Sm-Co nanopowder prepared by induction thermal plasma Peer-reviewed

Kwangjae Park, Yusuke Hirayama, Masaya Shigeta, Zheng Liu, Makoto Kobashi, Kenta Takagi

Journal of Alloys and Compounds　882　160633-160633　2021/11
Publisher: Elsevier BV
DOI： 10.1016/j.jallcom.2021.160633 　

ISSN： 0925-8388
Study on Proper Welding Condition for Ultranarrow Gap Submerged Arc Welding Peer-reviewed

Yohei Abe, Takahiro Fujimoto, Mitsuyoshi Nakatani, Masaya Shigeta, Manabu Tanaka

Welding International　35　(7-9)　369-381　2021/09/02
Publisher: Informa UK Limited
DOI： 10.1080/09507116.2021.1980298 　

ISSN： 0950-7116

eISSN： 1754-2138
Computational Study of Quenching Effects on Growth Processes and Size Distributions of Silicon Nanoparticles at a Thermal Plasma Tail Peer-reviewed

Masaya Shigeta, Yusuke Hirayama, Emanuele Ghedini

Nanomaterials　11　(6)　1370-(21 pages)　2021/05/21
Publisher: MDPI AG
DOI： 10.3390/nano11061370 　

eISSN： 2079-4991

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In this paper, quenching effects on silicon nanoparticle growth processes and size distributions at a typical range of cooling rates in a thermal plasma tail are investigated computationally. We used a nodal-type model that expresses a size distribution evolving temporally with simultaneous homogeneous nucleation, heterogeneous condensation, interparticle coagulation, and melting point depression. The numerically obtained size distributions exhibit similar size ranges and tendencies to those of experiment results obtained with and without quenching. In a highly supersaturated state, 40–50% of the vapor atoms are converted rapidly to nanoparticles. After most vapor atoms are consumed, the nanoparticles grow by coagulation, which occurs much more slowly than condensation. At higher cooling rates, one obtains greater total number density, smaller size, and smaller standard deviation. Quenching in thermal plasma fabrication is effectual, but it presents limitations for controlling nanoparticle characteristics.
High speed X-ray observation of digital controlled submerged arc welding phenomena Peer-reviewed

Yohei Abe, Takahiro Fujimoto, Mitsuyoshi Nakatani, Hisaya Komen, Masaya Shigeta, Manabu Tanaka

Science and Technology of Welding and Joining　26　(4)　332-340　2021/05/19
Publisher: Informa UK Limited
DOI： 10.1080/13621718.2021.1908746 　

ISSN： 1362-1718

eISSN： 1743-2936
Comparison between methods measuring arc efficiency of gas tungsten arc welding Peer-reviewed

Shoji Fujiyama, Masaya Shigeta, Manabu Tanaka

Science and Technology of Welding and Joining　1-6　2021/05/03
Publisher: Informa UK Limited
DOI： 10.1080/13621718.2021.1921101 　

ISSN： 1362-1718

eISSN： 1743-2936
Anisotropic Nd-Fe ultrafine particles with stable and metastable phases prepared by induction thermal plasma Peer-reviewed

Y. Hirayama, M. Shigeta, Z. Liu, N. Yodoshi, A. Hosokawa, K. Takagi

Journal of Alloys and Compounds　873　159724-159724　2021/03
Publisher: Elsevier BV
DOI： 10.1016/j.jallcom.2021.159724 　

ISSN： 0925-8388
Study on Proper Welding Condition for Ultrra-Narrow Gap Submerged Arc Welding Peer-reviewed

Y. Abe, T. Fujimoto, M. Nakatani, M. Shigeta, M. Tanaka

Quarterly Journal of the Japan Welding Society　39　(1)　64-74　2021/02

DOI： 10.2207/qjjws.39.64 　
Electrode contamination caused by metal vapour transport during tungsten inert gas welding Peer-reviewed

Keigo Tanaka, Masaya Shigeta, Hisaya Komen, Manabu Tanaka

Science and Technology of Welding and Joining　26　(3)　258-263　2021/02
Experimental Study on Effects of Gas-shielding in Lap-fillet Arc Welding Peer-reviewed

M. Tanaka, T. Yamada, M. Shigeta, H. Komen, M. Fukahori, N. Saito

Quarterly Journal of the Japan Welding Society　39　(1)　51-63　2021/02
Publisher: Japan Welding Society
DOI： 10.2207/qjjws.39.51 　

ISSN： 0288-4771

eISSN： 2434-8252
Particle simulation of nugget formation process during steel/aluminum alloy dissimilar resistance spot welding and thickness estimation of intermetallic compounds Peer-reviewed

Shinnosuke CHIKUCHI, Masaya SHIGETA, Hisaya KOMEN, Manabu TANAKA

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY　39　(4)　371-378　2021
Publisher: Japan Welding Society
DOI： 10.2207/qjjws.39.371 　

ISSN： 0288-4771

eISSN： 2434-8252
Numerical study of heat transfer process during electroslag welding by two-dimensional particle method Peer-reviewed

Ryo UENO, Masaya SHIGETA, Manabu TANAKA, Ryo TODA, Yasuyuki SAITO, Kei YAMAZAKI

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY　39　(4)　363-370　2021
Publisher: Japan Welding Society
DOI： 10.2207/qjjws.39.363 　

ISSN： 0288-4771

eISSN： 2434-8252
Observation of Phenomena in the Slag Bath during Electroslag Welding Peer-reviewed

Kei YAMAZAKI, Ryo ASANO, Ryo TODA, Yasuyuki SAITO, Masaya SHIGETA, Manabu TANAKA

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY　39　(4)　347-362　2021
Publisher: Japan Welding Society
DOI： 10.2207/qjjws.39.347 　

ISSN： 0288-4771

eISSN： 2434-8252
Numerical investigation for dominant factors in slag transfer and deposition process during metal active gas welding using incompressible smoothed particle hydrodynamics method Peer-reviewed

Takamasa FUKAZAWA, Keigo TANAKA, Hisaya KOMEN, Masaya SHIGETA, Manabu TANAKA, MURPHY Anthony Bruce

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY　39　(4)　277-290　2021
Publisher: Japan Welding Society
DOI： 10.2207/qjjws.39.277 　

ISSN： 0288-4771

eISSN： 2434-8252
Experimental investigation of dominant factors for droplet ejection from electrode during AC TIG welding Peer-reviewed

Kenta IIDA, Keigo TANAKA, Masaya SHIGETA, Hisaya KOMEN, Manabu TANAKA

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY　39　(4)　260-266　2021
Publisher: Japan Welding Society
DOI： 10.2207/qjjws.39.260 　

ISSN： 0288-4771

eISSN： 2434-8252
Identification of light emitting elements around tungsten electrode during TIG welding using optical emission spectroscopy Peer-reviewed

Keigo TANAKA, Masaya SHIGETA, Hisaya KOMEN, Manabu TANAKA

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY　39　(4)　248-259　2021
Publisher: Japan Welding Society
DOI： 10.2207/qjjws.39.248 　

ISSN： 0288-4771

eISSN： 2434-8252
Asymmetric Abel Inversion in Imaging Spectroscopy for Tilted TIG Arc Plasma Peer-reviewed

Yuto Yamashita, Masaya Shigeta, Hisaya Komen, Manabu Tanaka

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY　39　(4)　233-240　2021
Publisher: Japan Welding Society
DOI： 10.2207/qjjws.39.233 　

ISSN： 0288-4771

eISSN： 2434-8252
Modelling and measurements of gas tungsten arc welding in argon-helium mixtures with metal vapour International-coauthorship Invited Peer-reviewed

Junting Xiang, Keigo Tanaka, Fiona F. Chen, Masaya Shigeta, Manabu Tanaka, Anthony B. Murphy

Welding in the World　65　(4)　767-783　2021/01

DOI： 10.1007/s40194-020-01053-4 　
Effect of shielding gas composition on gas metal arc welding phenomena using rare earth metal added wire Peer-reviewed

TANAKA Manabu, METHONG Titinan, KOMEN Hisaya, SHIGETA Masaya, KATAOKA Tokihiko, MATSUSHITA Muneo, KOZUKI Shohei

Quarterly J. Japan Welding Soc.　38　(4)　438-447　2020/12
Publisher: Japan Welding Society
DOI： 10.2207/qjjws.38.438 　

ISSN： 0288-4771

eISSN： 2434-8252
Development of a Welding Condition Optimization Program for Narrow Gap SAW Peer-reviewed

Yohei ABE, Takahiro FUJIMOTO, Mitsuyoshi NAKATANI, Masaya SHIGETA, Manabu TANAKA

Quarterly Journal of the Japan Welding Society　38　(2)　98s-102s　2020/05
Numerical Simulation of Droplet Transfer with TiO2 Flux Column During Flux Cored Arc Welding by 3D Smoothed Particle Hydrodynamics Method Peer-reviewed

Ryo UENO, Hisaya KOMEN, Masaya SHIGETA, Manabu TANAKA

Quarterly Journal of the Japan Welding Society　38　(2)　84s-88s　2020/05
Imaging Spectroscopy for Transient Transport of Chromium Vapor During Helium TIG Welding International-coauthorship Peer-reviewed

Keigo TANAKA, Masaya SHIGETA, Manabu TANAKA, Anthony B. MURPHY

Quarterly Journal of the Japan Welding Society　38　(2)　21s-24s　2020/04
Numerical study of the metal vapour transport in tungsten inert-gas welding in argon for stainless steel International-coauthorship Peer-reviewed

Junting Xiang, Fion F. Chen, Hunkwan Park, Keigo Tanaka, Masaya Shigeta, Manabu Tanaka, Anthony B. Murphy

Applied Mathematical Modelling　79　713-728　2020/03

DOI： 10.1016/j.apm.2019.11.001 　
Recent progresses of welding and joining engineering

Satoru Asai, Manabu Tanaka, Satoshi Yamane, Fumikazu Miyasaka, Masaya Shigeta, Kazufumi Nomura, Yosuke Ogino

Yosetsu Gakkai Shi/Journal of the Japan Welding Society　89　(5)　322-335　2020
Publisher: Japan Welding Society
DOI： 10.2207/jjws.89.322 　

ISSN： 0021-4787
Numerical study of the effects and transport mechanisms of iron vapour in tungsten inert-gas welding in argon International-coauthorship Peer-reviewed

Junting Xiang, Hunkwan Park, Keigo Tanaka, Masaya Shigeta, Manabu Tanaka, Anthony B. Murphy

Journal of Physics D: Applied Physics　53　(4)　44004-(14 pages)　2020/01

DOI： 10.1088/1361-6463/ab51f3 　
NUMERICAL INVESTIGATION OF CORRELATION BETWEEN ARC PLASMA FLUCTUATION AND NANOPOWDER DISTRIBUTION International-coauthorship Peer-reviewed

Masaya Shigeta, Manabu Tanaka, Emanuele Ghedini

Proceedings of the Second Pacific Rim Thermal Engineering Conference　9　(12)　24037-(5 pages)　2019/12
Numerical analysis of correlation between arc plasma fluctuation and nanoparticle growth-transport under atmospheric pressure International-coauthorship Peer-reviewed

Masaya Shigeta, Manabu Tanaka, Emanuele Ghedini

Nanomaterials　9　(12)　1736-(13 pages)　2019/12

DOI： 10.3390/nano9121736 　
Visualization of electromagnetic-thermal-fluid phenomena in arc welding Invited Peer-reviewed

Masaya Shigeta, Manabu Tanaka

Japanese Journal of Applied Physics　59　SA0805-(12 pages)　2019/11

DOI： 10.7567/1347-4065/ab4e63 　
Investigation of the bilayer region of metal vapor in a helium tungsten inert gas arc plasma on stainless steel by imaging spectroscopy International-coauthorship Peer-reviewed

Keigo Tanaka, Masaya Shigeta, Manabu Tanaka, Anthony B. Murphy

Journal of Physics D: Applied Physics　52　(35)　354003-(9 pages)　2019/08

DOI： 10.1088/1361-6463/ab2441 　
The Relation Between Electrode Lifetime and Additive Consumption During TIG Welding Peer-reviewed

Keigo Tanaka, Tetsuo Yamada, Masaya Shigeta, Manabu Tanaka, Seiji Nakabayashi

Welding Letters　37　(4)　4WL-6WL　2019/08
Visualization of Submerged Arc Welding Phenomena by X-ray Observation and Direct Observation Peer-reviewed

Hisaya Komen, Yohei Abe, Takahiro Fujimoto, Masaya Shigeta, Mitsuyoshi Nakatani, Manabu Tanaka

Welding Letters　36　(4)　9WL-12WL　2018/12

DOI： 10.2207/qjjws.36.9WL 　
Three-Dimensional Numerical Simulation of Molten Metal Convection during Submerged Arc Welding Using DEM-ISPH Method

HISAYA KOMEN, MASAYA SHIGETA, MANABU TANAKA, YOHEI ABE, TAKAHIRO FUJIMOTO, MITSUYOSHI NAKATANI

Proceedings of ISER 404th International Conference on Heat Transfer and Fluid Flow　8-14　2018/10
Numerical simulation of slag forming process during submerged arc welding using DEM-ISPH hybrid method Invited Peer-reviewed

Hisaya Komen, Masaya Shigeta, Manabu Tanaka, Mitsuyoshi Nakatani, Yohei Abe

Welding In The World　62　(6)　1323-1330　2018/10

DOI： 10.1007/s40194-018-0655-x 　
Numerical simulation of molten metal droplet transfer and weld pool convection during gas metal arc welding using incompressible smoothed particle hydrodynamics method Peer-reviewed

Hisaya Komen, Masaya Shigeta, Manabu Tanaka

International Journal of Heat and Mass Transfer　121　978-985　2018/06/01
Publisher: Elsevier Ltd
DOI： 10.1016/j.ijheatmasstransfer.2018.01.059 　

ISSN： 0017-9310
Visualization of gas metal arc welding on globular to spray transition current Peer-reviewed

T. Methong, M. Shigeta, M. Tanaka, R. Ikeda, M. Matsushita, B. Poopat

Science and Technology of Welding and Joining　23　(1)　87-94　2018/01/02
Publisher: Taylor and Francis Ltd.
DOI： 10.1080/13621718.2017.1344454 　

ISSN： 1743-2936 1362-1718
Experimental measurements of gas shielding characteristics in tig welding with a constricted nozzle Peer-reviewed

Satoshi Miki, Kyohei Konishi, Masaya Shigeta, Manabu Tanaka, Akihisa Murata, Tadasuke Murata

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society　36　(1)　21-25　2018
Publisher: Japan Welding Society
DOI： 10.2207/qjjws.36.21 　

ISSN： 0288-4771
Numerical Study of Axial Magnetic Effects on a Turbulent Thermal Plasma Jet for Nanopowder Production Using 3D Time-Dependent Simulation Peer-reviewed

Masaya Shigeta

Journal of Flow Control, Measurement & Visualization　06　(02)　107　2018
Publisher: Scientific Research Publishing, Inc,
DOI： 10.4236/jfcmv.2018.62010 　

ISSN： 2329-3322
Numerical Simulation of Molten Metal Droplet Behavior in Gas Metal Arc Welding by Three-Dimensional Incompressible Smoothed Particle Hydrodynamics Method Peer-reviewed

Hisaya Komen, Masaya Shigeta, Manabu Tanaka

Journal of Flow Control, Measurement & Visualization　06　(02)　66　2018
Publisher: Scientific Research Publishing, Inc,
DOI： 10.4236/jfcmv.2018.62007 　

ISSN： 2329-3322
Modeling for collective growth of fume primary particles with charge effect in arc welding Peer-reviewed

Masaya Shigeta, Shota Minami, Manabu Tanaka

Welding in the World　62　(1)　203-213　2018/01/01
Publisher: Springer Verlag
DOI： 10.1007/s40194-017-0534-x 　

ISSN： 0043-2288
Visualization of Arc Phenomena during TIG Welding with a Constricted Nozzle Peer-reviewed

K. Konishi, M. Tanaka, M. Shigeta, A. Murata, T. Murata

Proceedings of The 3rd International Workshop on Welding and Joining (IWWJ) 2017　66-69　2017/11
Effect of Surface Tension on Simulation of Weld Pool Formation in TIG Welding Invited Peer-reviewed

A. Kurokawa, K. Konishi, M. Shigeta, M. Tanaka

Proceedings of IWIT & TWIT 2017　36-36　2017/11
Visualization of Metal Vapor Behavior in Helium Plasma during Gas Tungsten Arc Welding Invited Peer-reviewed

K. Tanaka, M. Shigeta, M. Tanaka

Proceedings of IWIT & TWIT 2017　29-29　2017/11
Cumputational Analysis of Weld Pool Convection Phenomena during Gas Metal Arc Welding using Tree-dimensional Incompressible SPH Method Invited Peer-reviewed

H. Komen, M. Shigeta, M. Tanaka

Proceedings of IWIT & TWIT 2017　27-27　2017/11
Plasma Charatceristics of Gas Metal Arc Welding on Globular Sypray Transition Current Invited Peer-reviewed

T. Methong, M. Shigeta, M. Tanaka, R. Ikeda, M. Matsushita

Proceedings of IWIT & TWIT 2017　25-25　2017/11
Numerical Simulation of TIG arcs including Tungsten Electrode Phenomena Invited Peer-reviewed

M. Tanaka, K. Konishi, M. Shigeta, T. Takida, S. Nakabayashi, A.Tsuji

Proceedings of IWIT & TWIT 2017　61-61　2017/11
Measurements of Oxygen Contamination in TIG Welding with a Constricted Nozzle

S. Miki, K. Konishi, M. Shigeta, M. Tanaka, A. Murata, T. Murata

Proceeding of WSE & CAWE 2017　414-417　2017/10
Observation of Dynamic Metal Vapor Behavior in Gas Tungsten Arc Welding International-coauthorship

K. Tanaka, M. Shigeta, M. Tanaka, A.B. Murphy

Proceeding of WSE & CAWE 2017　218-221　2017/10
Analysis of dynamic plasma behaviours in gas metal arc welding by imaging spectroscopy Peer-reviewed

Masaya Shigeta, Shota Nakanishi, Manabu Tanaka, Anthony B. Murphy

Welding International　31　(9)　669-680　2017/09/02
Publisher: Taylor and Francis Ltd.
DOI： 10.1080/09507116.2016.1223220 　

ISSN： 1754-2138 0950-7116
Effect of rare earth metal on plasma properties in GMAW using CO2 shielding gas Peer-reviewed

Titinan Methong, Tasuku Yamaguchi, Masaya Shigeta, Manabu Tanaka, Rinsei Ikeda, Muneo Matsushita, Bovornchok Poopat

WELDING IN THE WORLD　61　(5)　1039-1047　2017/09

DOI： 10.1007/s40194-017-0491-4 　

ISSN： 0043-2288

eISSN： 1878-6669
Time-dependent 3D simulation of nanopowder growth and transport in a turbulent field induced by a thermal plasma jet

M. Shigeta

Book of Extended Abstracts of the 23rd International Symposium on Plasma Chemistry　661-663　2017/07
Publisher: International Plasma Chemistry Society
Modeling of Submerged Arc Welding Phenomena and Experimental Study of the Heat Source Characteristics Peer-reviewed

Hisaya Komen, Sho Matsui, Kyohei Konishi, Masaya Shigeta, Manabu Tanaka, Takahiro Kamo

Quarterly J. Japan Welding Soc.　35　(2)　93-101　2017/07
Publisher: JAPAN WELDING SOCIETY
DOI： 10.2207/qjjws.35.93 　

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Computational model of submerged arc welding (SAW) was developed to clarify the arc phenomena and the heat source characteristics. Furthermore, the weld part during SAW was observed using an X-ray transmission system. To investigate the effect of the closed space on arc phenomena, the heat flux and current density distributions on a base metal surface during closed gas tungsten arc welding were measured by split anode method. Computational results showed that the metal vapor concentration in arc space during SAW became higher because the arc was generated in the closed space. However, its heat input to the base metal was almost the same as that of gas metal arc welding. Meanwhile, the welding current and arc voltage which largely affect characteristics of arc plasma agreed with the experiment results. The slag thickness obtained from the computation was also the same as that of the experiment, which supports the validity of this computational model. Moreover, comparative experiments with gas tungsten arc and closed gas tungsten arc showed that the closed space environment around the weld part in SAW did not affect heat characteristics of arc plasma. It was clarified that heat transfer and radiation energy of arc play different roles in SAW. Penetration of a base metal was formed by the heating from arc. Flux was melted by the radiative heating from arc, and it formed slag. It was suggested that the high heat efficiency from 90 to 99% during SAW was obtained since the radiation energy was given to a base metal indirectly through the slag.
Numerical Analysis of Heat Source Characteristics of a Constricted TIG Arc for Welding of Aluminium International-coauthorship Peer-reviewed

K. Konishi, M. Shigeta, M. Tanaka, A. Murata, T. Murata, A.B. Murphy

Journal of Light Metal Welding　55　(6)　227-232　2017/06
Publisher:
ISSN： 0368-5306
Numerical Analysis of Dynamic Behavior of Additives in Electrode During TIG Welding Process Peer-reviewed

Kyohei KONISHI, Manabu TANAKA, Masaya SHIGETA, Kazuya ISHIDA, Akitoshi KUROKAWA, Tomohiro TAKIDA, Seiji NAKABAYASHI, Ayuri TSUJI

Quarterly J. Japan Welding Soc.　35　(2)　73-84　2017/05

DOI： 10.2207/qjjws.35.73 　
Computational analysis of arc phenomena during GTA welding with a constricted nozzle International-coauthorship

K. Konishi, M. Tanaka, M. Shigeta, A. Murata, T. Murata, A.B. Murphy

Proceedings of CHT-17　CHT-17-229　2017/05
Diagnostic of Heat Source Characteristics in Gas Metal Arc Welding Using CO2 Shielding Gas Peer-reviewed

Titinan Methong, Masaya Shigeta, Manabu Tanaka, Rinsei Ikeda, Muneo Matsushita, Tokihiko Kataoka

Quarterly J. Japan Welding Soc.　35　(2)　103s-107s　2017/04
Simulation of Flux Melting Process during a SAW by DEM-ISPH Hybrid Method Peer-reviewed

Hisaya Komen, Masaya Shigeta, Manabu Tanaka, Mitsuyoshi Nakatani, Yohei Abe

Quarterly J. Japan Welding Soc.　35　(2)　38s-41s　2017/03
溶接熱源のモデル化とそれによる溶融池形成予測システムの開発

浅井知, 田中学, 川人洋介, 茂田正哉, 野村和史, 松田朋己, 荻野陽輔

溶接学会誌　86　(1)　27-31　2017/01
Particle simulations of molten metal flows in arc welding processes Peer-reviewed

Masaya Shigeta

Yosetsu Gakkai Shi/Journal of the Japan Welding Society　86　(6)　436-442　2017
Publisher: Japan Welding Society
DOI： 10.2207/jjws.86.436 　

ISSN： 0021-4787
Numerical study on thermal non-equilibrium of arc plasmas in TIG welding processes using a two-temperature model Peer-reviewed

K. Konishi, M. Shigeta, M. Tanaka, A. Murata, T. Murata, Anthony B. Murphy

WELDING IN THE WORLD　61　(1)　197-207　2017/01

DOI： 10.1007/s40194-016-0391-z 　

ISSN： 0043-2288

eISSN： 1878-6669
Development of prediction technique of weld pool formation with heat source model Peer-reviewed

Satoru Asai, Manabu Tanaka, Yousuke Kawahito, Masaya Shigeta, Kazufumi Nomura, Tomoki Matsuda, Yosuke Ogino

Yosetsu Gakkai Shi/Journal of the Japan Welding Society　86　(1)　27-31　2017

DOI： 10.2207/jjws.86.27 　

ISSN： 0021-4787
Influences of welding conditions on the constricted TIG arcs Peer-reviewed

Kyohei Konishi, Masaya Shigeta, Manabu Tanaka, Akihisa Murata, Tadasuke Murata

Welding International　30　(12)　927-934　2016/12/01
Publisher: Taylor and Francis Ltd.
DOI： 10.1080/09507116.2016.1142211 　

ISSN： 1754-2138 0950-7116
Measurement of Metal Vapor Behavior in Helium Plasma during Gas Tungsten Arc Welding International-coauthorship

Keigo Tanaka, Titinan Methong, Masaya Shigeta, Manabu Tanaka, Anthony B. Murphy

Proceedings of the 31st International Congress on High-Speed Imaging and Photonics　616-618　2016/11
Visualization of Plasma Temperature and Weld Pool Convection during Gas Metal Arc Welding International-coauthorship

Hisaya Komen, Keigo Tanaka, Masaya Shigeta, Manabu Tanaka, Anthony B. Murphy

Proceedings of the 31st International Congress on High-Speed Imaging and Photonics　611-615　2016/11
Heat Flux and Electromagnetic Force affected by Current Frequency in Argon Pulsed Arc Welding Mixed with Oxygen

Yoshifumi Maeda, Shinji Yamamoto, Toru Iwao, Shinichi Tashiro, Masaya Shigeta, Manabu Tanaka

Proceedings of 10th International Conference on Trends in Welding Research & 9th International Welding Symposium of Japan Welding Society (9WS)　956-959　2016/10
Radiation and Temperature Distribution of Ar Arc Contaminated with Nitrogen in Pulsed TIG Welding

Toru Iwao, Hiroki Takahashi, Yoshifumi Maeda, Shinji Yamamoto, Shinichi Tashiro, Masaya Shigeta, Manabu Tanaka

Proceedings of 10th International Conference on Trends in Welding Research & 9th International Welding Symposium of Japan Welding Society (9WS)　398-401　2016/10
Numerical Investigation of Charge Effect on Collective Growth of Iron Nanoparticles Generated in Arc Welding

Shota Minami, Masaya Shigeta, Manabu Tanaka

Proceedings of 10th International Conference on Trends in Welding Research & 9th International Welding Symposium of Japan Welding Society (9WS)　402-405　2016/10
Effects of a constricted nozzle on the arc phenomena in the TIG welding process* Peer-reviewed

Konishi Kyohei, Shigeta Masaya, Tanaka Manabu, Murata Akihisa, Murata Tadasuke

Welding International　30　(8)　590-595　2016/08/02
Publisher: Taylor and Francis Ltd.
DOI： 10.1080/09507116.2016.1142183 　

ISSN： 1754-2138 0950-7116
Modelling for collective growth of fume primary particles with charge effect in arc welding

M. Shigeta, S. Minami, M. Tanaka

69th Annual Assembly of Int. Inst. Welding (IIW)　IIW Doc. 212-1432-16　2016/07
Effect of rare earth metal on plasma properties in GMAW using CO2 shielding gas

T. Methong, T. Yamaguchi, M. Shigeta, M. Tanaka, R. Ikeda, M. Matsushita, T. Kataoka

69th Annual Assembly of Int. Inst. Welding (IIW)　IIW Doc.212-1435-16　2016/07
Incompressible SPH simulation of molten metal droplet transfer and weld pool convection during GMA Welding

H. Komen, M. Shigeta, M. Tanaka

69th Annual Assembly of Int. Inst. Welding (IIW)　IIW Doc.212-1431-16　2016/07
Numerical analysis of arc phenomena during TIG welding with a constricted nozzle by using a two-temperature model International-coauthorship

K. Konishi, M. Shigeta, A. Murata, T. Murata, A.B. Murphy, M. Tanaka

69th Annual Assembly of Int. Inst. Welding (IIW)　IIW Doc.212-1433-16　2016/07
Effect of saturation pressure difference on metal-silicide nanopowder formation in thermal plasma fabrication Peer-reviewed

Masaya Shigeta, Takayuki Watanabe

Nanomaterials　6　(3)　43-(10 pages)　2016/03/07
Publisher: MDPI AG
DOI： 10.3390/nano6030043 　

ISSN： 2079-4991
Numerical Analysis of Convective Transfer of Nanopowder Generated around a Turbulent-Like Thermal Plasma Jet

Masaya Shigeta, Manabu Tanaka

Proceedings of the First Pacific Rim Thermal Engineering Conference (PRTEC)　PRTEC-14664 (5 pages)　2016/03
Study on arc plasma properties during TIG welding with a constricted nozzle International-coauthorship

K. Konishi, S. Miki, M. Shigeta, A. Murata, T. Murata, A.B. Murphy, M. Tanaka

Commissions I, IV, XII and SG 212 Intermediate Meeting of Int. Inst. Welding (IIW)　IIW Doc.212-1407-16　2016/03
Qualitative and quantitative analyses of arc characteristics in SMAW Peer-reviewed

Masaya Shigeta, Takahiro Ikeda, Manabu Tanaka, Tetsuo Suga, Bovornchok Poopat, Somporn Peansukmanee, Niwat Kunawong, Ackadech Lersvanichkool, Hiroaki Kawamoto, Supot Thongdee, Kazuyuki Suenaga, Makoto Ota

WELDING IN THE WORLD　60　(2)　355-361　2016/02

DOI： 10.1007/s40194-015-0288-2 　

ISSN： 0043-2288

eISSN： 1878-6669
Three-Dimensional Simulation of the Weld Pool Convection in GMA Welding using Incompressible SPH Method

Komen Hisaya, Shigeta Masaya, Tanaka Manabu

Preprints of the National Meeting of JWS　2016　178-179　2016
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2016s.0_178 　
Numerical analysis for heat source characteristic of a constricted TIG arc by using a two-temperature model

Konishi Kyohei, Miki Satoshi, Shigeta Masaya, Tanaka Manabu, Murata Akihisa, Murata Tadasuke, MURPHY Anthony B.

Preprints of the National Meeting of JWS　2016　242-243　2016
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2016f.0_242 　
Experimental observation of arc plasma phenomena during TIG welding with a constricted nozzle

Miki Satoshi, Konishi Kyouhei, Shigeta Masaya, Tanaka Manabu, Murata Akihisa, Murata Yuusuke

Preprints of the National Meeting of JWS　2016　240-241　2016
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2016f.0_240 　
Numerical Analysis of Charge Effect on Collective Growth of Primary Particles of Fume in Arc Welding

Minami Shota, Shigeta Masaya, Tanaka Manabu

Preprints of the National Meeting of JWS　2016　238-239　2016
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2016f.0_238 　
Effect of precursor fraction on suicide nanopowder growth under thermal plasma conditions: A computational study Peer-reviewed

Masaya Shigeta, Takayuki Watanabe

POWDER TECHNOLOGY　288　191-201　2016/01

DOI： 10.1016/j.powtec.2015.11.005 　

ISSN： 0032-5910

eISSN： 1873-328X
Incompressible SPH Simulation of Weld Pool Convection with Molten Metal Droplets in a GMA Welding Peer-reviewed

Hisaya KOMEN, Masaya SHIGETA, Manabu TANAKA, Yu FUKUNISHI

Quarterly J. Japan Welding Soc.　33　(4)　332-340　2015/12

DOI： 10.2207/qjjws.33.332 　
Simple nonequilibrium model of collective growth and transport of metal nanomist in a thermal plasma process Peer-reviewed

Masaya Shigeta

Theoretical and Applied Mechanics Japan　63　147-154　2015/10/10
Publisher: Science Council of Japan
DOI： 10.11345/nctam.63.147 　

ISSN： 1349-4244 1348-0693
Numerical Analysis of TIG Arc Phenomena Considering non-LTE Plasma International-coauthorship

K. Konishi, M. Shigeta, M. Tanaka, A. Murata, T. Murata, A.B. Murphy

Proceedings of The 6th International Conference on Welding Science and Engineering (WSE2015)　151-154　2015/09
Numerical prediction of growth and convective transport of Si nanoparticles around an Ar thermal plasma jet with He mixture

M. Shigeta, M. Tanaka

Proceedings of the 22nd International Symposium on Plasma Chemistry (ISPC22)　OS-21-4 (4 pages: USB)　2015/07
Visualization of arc phenomena produces a revolutionary wave of innovation in welding technology Invited

M. Tanaka, Y. Hirata, M. Shigeta, F. Nomura, Y. Ogino

Welding Technology　63　(7)　42-47　2015/07
Simulation of Weld Pool Convection during GMA Welding using Incompressible Smoothed Particle Hydrodynamics Method

H. Komen, M. Shigeta, M. Tanaka, Y. Fukunishi

68th Annual Assembly of Int. Inst. Welding (IIW)　IIW Doc.212-1377-15　2015/06
A Simplified Numerical Model of Submerged Arc Welding

M. Tanaka, M. Shigeta, F. Miyasaka, K. Kasano

68th Annual Assembly of Int. Inst. Welding (IIW)　IIW Doc.212-1376-15　2015/06
Two-temperature model analysis of non-LTE arc plasma International-coauthorship

K. Konishi, M. Shigeta, M. Tanaka, A. Murata, T. Murata, A.B. Murphy

68th Annual Assembly of Int. Inst. Welding (IIW)　IIW Doc.212-1375-15　2015/06
Incompressible SPH simulation of a Flow in Weld Pool with Metal Droplet Peer-reviewed

Hisaya Komen, Masaya Shigeta, Manabu Tanaka

Journal of Smart Processing　4　(3)　165-170　2015/05
Numerical Analysis of Arc Plasma in TIG Welding with an Additional Gas Nozzle

Kyohei KONISHI, Masaya SHIGETA, Manabu TANAKA, Akihisa MURATA, Tadasuke MURATA

Proceedings of ASME-ATI-UIT 2015 Conference on Thermal Energy Systems: Production, Storage, Utilization and the Environment　Paper #134(3 pages)　2015/05
Effects of surface tension on predictions of weld pool formation in TIG welding Peer-reviewed

Masayoshi Miyake, Masaya Shigeta, Manabu Tanaka

Quarterly J. Japan Welding Soc.　33　(2)　116s-119s　2015/05

DOI： 10.2207/qjjws.33.116s 　
Numerical Simulation of Joining Process in a TIG Welding System Using Incompressible SPH Method Peer-reviewed

Masumi Ito, Seiichiro Izawa, Yu Fukunishi, Masaya Shigeta

Quarterly J. Japan Welding Soc.　33　(2)　34s-38s　2015/05

DOI： 10.2207/qjjws.33.34s 　
Analysis of dynamic plasma behaviors in gas metal arc welding by imaging spectroscopy International-coauthorship Peer-reviewed

Masaya Shigeta, Shota Nakanishi, Manabu Tanaka, Anthony B. Murphy

Quarterly J. Japan Welding Soc.　33　(2)　118-125　2015/05

DOI： 10.2207/qjjws.33.118 　
Quantitative analysis of arc characteristics in SMAW

Masaya Shigeta, Manabu Tanaka

Proceedings of Joint Intermediate Meeting of International Institute of Welding (IIW) Comm. IV, XII and SG212　Doc. XII-2204-15/IV-1225-15/212-1351-15　2015/04
Effects of surface tension on predictions of weld pool formation in GTA welding

Manabu Tanaka, Masaya Shigeta

Proceedings of Joint Intermediate Meeting of International Institute of Welding (IIW) Comm. IV, XII and SG212　Doc. XII-2220-15/IV-1239-15/212-1364-15　2015/04
Effects of a constricted nozzle on the arc phenomena in TIG welding process International-coauthorship Peer-reviewed

Kyohei KONISHI, Masaya SHIGETA, Manabu TANAKA, Akihisa MURATA, Tadasuke MURATA, Anthony B. Murphy

Quarterly Journal of the Japan Welding Society　33　(1)　42-48　2015/03

DOI： 10.2207/qjjws.33.42 　
Numerical analysis of collective growth of primary fume particles in arc welding Peer-reviewed

Masaya Shigeta, Masayoshi Miyake, Manabu Tanaka

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society　33　(4)　365-375　2015
Publisher: Japan Welding Society
DOI： 10.2207/qjjws.33.365 　

ISSN： 0288-4771
Numerical Simulation of a Weld Pool Formation in a TIG Welding Using an Incompressible SPH Method Peer-reviewed

M. Ito, S. Izawa, Y. Fukunishi, M. Shigeta

Quarterly J. Japan Welding Soc.　32　(4)　213-222　2015/01

DOI： 10.2207/qjjws.32.213 　
Measurements and numerical simulations in arc welding processes Peer-reviewed

Yoshinori Hirata, Manabu Tanaka, Masaya Shigeta, Kazufumi Nomura, Yosuke Ogino

Yosetsu Gakkai Shi/Journal of the Japan Welding Society　84　(1)　19-24　2015
Publisher: Japan Welding Society
DOI： 10.2207/jjws.84.19 　

ISSN： 0021-4787
Computational prediction of niobium-silicide nanopowder growth in thermal plasma synthesis

Masaya Shigeta

SENAC (Supercomputing System Cyberscience Center Tohoku University)　47　(4)　11-15　2014/10
Publisher: Cyberscience Center, Tohoku University
Experimental study on control of highly unsteady separating flow Peer-reviewed

Yu NISHIO, Takuo ENDO, Masaya SHIGETA, Seiichiro IZAWA, Yu FUKUNISHI

Journal of Fluid Science and Technology　9　(3)　JFST0046　2014/09
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jfst.2014jfst0046 　
Temperature measurements of gas tungsten arcs

K. Konishi, M. Shigeta, M. Tanaka

67th Annual Assembly of Int. Inst. Welding (IIW)　IIW Doc.212-1323-14　2014/07
Three-dimensional Fluid Dynamic Simulation of Radio-frequency Inductively Coupled Thermal Plasmas

Shigeta Masaya

Trans. JWRI　43　(1)　1-4　2014/06
Publisher: Joining and Welding Research Institute, Osaka University
ISSN： 0387-4508
Flow Simulation of a Weld Pool in TIG welding by SPH method Invited

M. Shigeta, M. Tanaka, M. Ito, S. Izawa, Y. Fukunishi

Proceeding of Japan-Indonesia Welding Seminar 2014　34-35　2014/05
Publisher: Universitas Indonesia Kampus Baru UI - Depok 16424
Wind of Smart Arc Welding Technology in Japan Invited

M. Tanaka, M. Shigeta, K. Konishi, A. Murata, T. Murata

Proceeding of Japan-Indonesia Welding Seminar 2014　4-7　2014/05
Influence of Plasma Properties on Metal Transfer Phenomena in Gas Metal Arc Welding

M. Tanaka, M. Shigeta

Commissions IV, XII and SG 212 Intermediate Meeting of Int. Inst. Welding (IIW)　IIW Doc. XII-2167-14　2014/03
Elucidation of relationship between plasma phenomena and the transition of droplet transfer form in gas metal arc welding

Ikeda Takahiro, shigeta masaya, tanaka manabu

Preprints of the National Meeting of JWS　2014　196-197　2014
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2014f.0_196 　
Reliability evaluation of temperature measurement for gas tungsten arcs

Yamaguchi Tasuku, Konishi Kyohei, Shigeta Masaya, Tanaka Manabu, Murata Akihisa, Murata Tadasuke

Preprints of the National Meeting of JWS　2014　194-195　2014
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2014f.0_194 　
Computational method for ambient gas entrainment into a plasma flow

Shigeta Masaya, Tanaka Manabu

Preprints of the National Meeting of JWS　2014　200-201　2014
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2014f.0_200 　
Effects of high speed gas flow on stability of short gap TIG arc

Konishi Kyohei, Shigeta Masaya, Tanaka Manabu, Murata Akihisa, Murata Tadasuke

Preprints of the National Meeting of JWS　2014　198-199　2014
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2014f.0_198 　
Dynamic numerical simulation of GMA Welding

Ishida kazuya, Tuzimura Yoshihiro, Shigeta Masaya, Tanaka Manabu

Preprints of the National Meeting of JWS　2014　206-207　2014
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2014f.0_206 　
Influences of welding conditions on the constricted TIG arcs Peer-reviewed

Kyohei Konishi, Masaya Shigeta, Manabu Tanaka, Akihisa Murata, Tadasuke Murata

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society　32　(3)　207-212　2014
Publisher: Japan Welding Society
DOI： 10.2207/qjjws.32.207 　

ISSN： 0288-4771
Effects of a constricted nozzle on the arc phenomena in TIG welding process Peer-reviewed

Konishi Kyohei, Shigeta Masaya, Tanaka Manabu, Murata Akihisa, Murata Tadasuke

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society　32　(2)　47-51　2014
Publisher: Japan Welding Society
DOI： 10.2207/qjjws.32.47 　

ISSN： 0288-4771
Numerical study on receptivity of flat-plate boundary layer to external disturbances Peer-reviewed

Shuta Noro, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi

Theoretical and Applied Mechanics Japan　62　3-12　2014
Publisher: Science Council of Japan
DOI： 10.11345/nctam.62.3 　

ISSN： 1349-4244 1348-0693
SPH Simulation for Weld Pool Flows in TIG welding Invited

Masaya Shigeta, Manabu Tanaka, Masumi Ito, Seiichiro Izawa, Yu Fukunishi

Proceedings of 3rd China-Japan Workshop on Welding Thermo-Physics　29-31　2013/11
Publisher: China Welding Society
Numerical Simulation of Multiple Thermal Plasma Plumes from a Jet Array Peer-reviewed

Masaya Shigeta

Abstract book of the 12th International Conference on Fluid Control, Measurements, and Visualization (FLUCOME2013)　OS13-01-2 (10 pages: USB)　2013/11
Publisher: The Visualization Society of Japan
A Wind of Smart Arc Welding Technology in Japan

M. Tanaka, M. Shigeta, K. Konishi

Proceedings of 3rd China-Japan Workshop on Welding Thermo-Physics　1-5　2013/11
Study of Inner Ledge Effect on the Aerodynamic Noise Generation from a Deep Cavity Peer-reviewed

Yu Fukunishi, Yoichiro Nishi, Masaya Shigeta, Seiichiro Izawa

The 14th Asian Congress of Fluid Mechanics　9-12　2013/10
Numerical Simulation of Shielding Gas Flow in Arc Welding System Using SPH Method Peer-reviewed

Masumi Ito, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi

he 14th Asian Congress of Fluid Mechanics　389-392　2013/10
Relation between Deformation of Wall-normal Vortices and Leading Edge Receptivity Peer-reviewed

Yu Nishio, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi

The 14th Asian Congress of Fluid Mechanics　241-245　2013/10
An experimental study on highly unsteady separating flow Peer-reviewed

Seiichiro Izawa, Takuo Endo, Masaya Shigeta, Yu Fukunishi

Proceedings of 4th International Conference on Jets, Wakes and Separated Flows　CD-ROM(4 pages)　2013/09
Publisher: The Japan Society of Mechanical Engineers
Numerical Study on Leading-Edge Receptivity to Freestream Vertical Vorticity Peer-reviewed

Yu NISHIO, Masaya SHIGETA, Seiichiro IZAWA, Yu FUKUNISHI

Journal of Fluid Science and Technology　8　(1)　136-145　2013
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/jfst.8.136 　

eISSN： 1880-5558
Numerical investigation of nano-material processing by thermal plasma flows Peer-reviewed

Masaya Shigeta

Sustained Simulation Performance 2012 - Proceedings of the Joint Workshop on High Performance Computing on Vector Systems, and Workshop on Sustained Simulation Performance　169-182　2013
Publisher: Springer Science and Business Media, LLC
DOI： 10.1007/978-3-642-32454-3-14 　
Boundary layer receptivity to localized disturbances in freestream caused by a vortex ring collision Peer-reviewed

Noro S, Suzuki Y, Shigeta M, Izawa S, Fukunishi Y

Journal of Applied Fluid Mechanics　6　(3)　425-433　2013
Numerical Study on Receptivity of Flat-Plate Boundary Layer to Outer Freestream Disturbances

Shuta Noro, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi

The Ninth International Conference on Flow Dynamics　528-529　2012/09
SPH Simulation of Gas Flow Accompanying Thermal Expansion

Masumi Ito, Seiichiro Izawa, Yu Fukunishi, Masaya Shigeta

The Ninth International Conference on Flow Dynamics　588-589　2012/09
The Effect of Actuator Length-Scale on Excited Waves

Hajime Okawa, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi

The Ninth International Conference on Flow Dynamics　340-341　2012/09
Simulation of Liquid Jet Breakup Process by Three-Dimensional Incompressible SPH Method Peer-reviewed

Tadahiro Takashima, Takuya Ito, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi

Seventh International Conference on Computational Fluid Dynamics　(ICCFD-2901)　2012/07
SPH Simulation of Gas Arc Welding Process Peer-reviewed

Masumi Ito, Seiichiro Izawa, Yu Fukunishi, Masaya Shigeta

Seventh International Conference on Computational Fluid Dynamics　(ICCFD-3706)　2012/07
Simple equations to describe aerosol growth Peer-reviewed

Valerian A. Nemchinsky, Masaya Shigeta

MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING　20　(4)　2012/06

DOI： 10.1088/0965-0393/20/4/045017 　

ISSN： 0965-0393
A two-dimensional nodal model with turbulent effects for the synthesis of Si nano-particles by inductively coupled thermal plasmas Peer-reviewed

V. Colombo, E. Ghedini, M. Gherardi, P. Sanibondi, M. Shigeta

PLASMA SOURCES SCIENCE & TECHNOLOGY　21　(2)　2012/04

DOI： 10.1088/0963-0252/21/2/025001 　

ISSN： 0963-0252
Formation mechanism of titanium boride nanoparticles by RF induction thermal plasma Peer-reviewed

Yingying Cheng, Masaya Shigeta, Sooseok Choi, Takayuki Watanabe

CHEMICAL ENGINEERING JOURNAL　183　483-491　2012/02

DOI： 10.1016/j.cej.2011.12.040 　

ISSN： 1385-8947
Numerical Study on Leading Edge Receptivity of the Flat Plat Boundary Layer to Vortical Disturbance

Y. Nishio, M. Shigeta, S. Izawa, Y. Fukunishi

International Conference on Computational Fluid Dynamics 7　2012
Leading Edge Receptivity to Freestream with Velocity Profile Sinusoidal in the Spanwise Direction

Yu Nishio, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi

Ninth International Conference on Flow Dynamics　538-539　2012
Simulation of Boundary Layer Receptivity to Outer Disturbances Peer-reviewed

Shuta Noro, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi

The Eighth International Conference on Flow Dynamics　486-487　2011/11
Simulation of Velocity Fluctuation Generated by Vibrating Actuator Peer-reviewed

Hajime Okawa, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi

The Eighth International Conference on Flow Dynamics　584-585　2011/11
Incompressible SPH Simulation of a Droplet and a Liquid Column with Marangoni Convection Peer-reviewed

Masumi Ito, Seiichiro Izawa, Yu Fukunishi, Masaya Shigeta

The Eighth International Conference on Flow Dynamics　580-581　2011/11
Flow Control of Unsteadily Separating Flow Peer-reviewed

Tomoki Hayashi, Hiromasa Oe, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi

The Eighth International Conference on Flow Dynamics　246-247　2011/11
Simulation of fluid motion in arc weld pool under electromagnetic field

Masumi Ito, Seiichiro Izawa, Yu Fukunishi, Masaya Shigeta

Kyoto university RIMS research information repository　1724　131-142　2011
Publisher:
ISSN： 1880-2818
3D SPH simulation of droplet and liquid sheet flow accompanying large surface deformation

Masaya Shigeta, Masanori Agawa, Takuya Hongo, Seiichiro Izawa, Yu Fukunishi

Kyoto university RIMS research information repository　1724　143-147　2011
Publisher:
ISSN： 1880-2818
Separation point predicting method based on local growth of instability waves

Yu Fukunishi, Jay, Prakash Goit, Masaya Shigeta, Seiichiro Izawa

Kyoto university RIMS research information repository　1724　148-153　2011
Publisher:
ISSN： 1880-2818
Analysis based on numerical simulation of boundary receptivity to outer disturbances

Shuta Noro, Satoko Komurasaki, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi

Kyoto university RIMS research information repository　1724　154-161　2011
Publisher:
ISSN： 1880-2818
Process of Leading Edge Receptivity to Periodic Disturbances

Yu Nishio, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi

Eighth International Conference on Flow Dynamics　478-479　2011
Nanoparticle synthesis by thermal plasmas Peer-reviewed

Watanabe T, Shigeta M

Nanomaterials: Properties, Preparation and Processes　115-176　2011
Hotwire measurement and numerical analysis of flows around a straight wing vertical axis wind turbine Peer-reviewed

Yuko Sato, Hironari Okazaki, Tatsuya Shoda, Yu Nishio, Masaya Shigeta, Seiichiro Izawa

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B　77　(775)　637-646　2011

DOI： 10.1299/kikaib.77.637 　

ISSN： 0387-5016
Generation of velocity fluctuations in a boundary layer by a piezoelectric actuator Peer-reviewed

Hajime Okawa, Shigenori Kondo, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi

ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011　1　(D)　3109-3115　2011

DOI： 10.1115/AJK2011-13018 　
Three-dimensional simulation of a flow in an arc weld pool by SPH method Peer-reviewed

Masaya Shigeta, Masumi Ito, Seiichiro Izawa, Yu Fukunishi

The International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation　9-10　2010/11/11
A Lagrangian Analysis of Turbulent Vortex Motions using the Vortex Blob Method Peer-reviewed

Seiichiro Izawa, Masaya Shigeta, Yu Fukunishi

The 5th International Conference on Vortex Flows and Vortex Models　2010/11/07
Passive Control of Oscillating and Separating Flow Peer-reviewed

Hiromasa Oe, Shota Teramoto, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi

The Seventh International Conference on Flow Dynamics　254-255　2010/11/01
Numerical Study of Boundary Layer Receptivity to Outer Disturbances Peer-reviewed

Shuta Noro, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi

The Seventh International Conference on Flow Dynamics　498-499　2010/11/01
Characteristics of Velocity Fluctuations in a Boundary Layer Excited by a Piezo Actuator Driven with Two Different Signals Peer-reviewed

Hajime Okawa, Shigenori Kondo, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi

The Seventh International Conference on Flow Dynamics　536-537　2010/11/01
Suppression of Aeroacoustic Noise Generation by Controlling the Circulating Fluid Motions inside a Cavity Peer-reviewed

Seiichiro Izawa, Hiroaki Nishida, Hiroyuki Nakashima, Masaya Shigeta, Yu Fukunishi

The 3rd International Conference on Jets, Wakes, and Separated Flows　2010/09/27
S0505-1-4 Relation between Operating Models of Piezo Actuators and Excited Instability Waves in a Boundary Layer

KONDO Shigenori, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

The proceedings of the JSME annual meeting　2010　225-226　2010
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2010.2.0_225 　

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The characteristics of the velocity fluctuation waves excited by a piezo actuator are investigated. The actuator is driven by two kinds of signals: a sinusoidal and a rectangular signal. In order to investigate the characteristics, two methods are chosen. They are the power spectrum method and the correlation coefficient method. The comparison of the power spectrum peaks of the two cases shows that the fluctuation waves grow along the flow direction at different growth ratios. It is also found that the waveform changes for the rectangular signal case.
J0504-4-3 Relation between a stationary vortex inside a cavity and aerodynamic noise generation

NAKASHIMA Hiroyuki, NISHIDA Hiroaki, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

The proceedings of the JSME annual meeting　2010　99-100　2010
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2010.7.0_99 　

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An aeroacoustic noise generated from a rectangular cavity can be suppressed by placing a square rod at a proper location on the bottom surface of the cavity. The present paper focuses on the relation between the fluid motions inside the cavity and the generation of cavity noise. The results of flow measurement and the wavelet analysis of sound signal imply that the rod causes the formation of the feedback loop system take place intermittently and occasionally, suppressing the cavity noise.
Leading Edge Receptivity to Oncoming Vortices

Yu Nishio, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi

The 5th Tohoku University – Seoul National University Joint Workshop on Next Generation Aero Vehicle　42-43　2010
Leading Edge Receptivity to Periodic Disturbances Generated by Oscillating Wings

Yu Nishio, Masaya Shigeta, Seiihiro Izawa, Yu Fukunishi

The Seventh International Conference on Flow Dynamics　558-559　2010
Nanoparticle synthesis by thermal plasmas Peer-reviewed

Watanabe T, Shigeta M

Nanoparticles: Properties, Classification, Characterization, and Fabrication　149-212　2010
Two-Directional Nodal Model for Co-Condensation Growth of Multicomponent Nanoparticles in Thermal Plasma Processing Peer-reviewed

Masaya Shigeta, Takayuki Watanabe

JOURNAL OF THERMAL SPRAY TECHNOLOGY　18　(5-6)　1022-1037　2009/12

DOI： 10.1007/s11666-009-9316-3 　

ISSN： 1059-9630
Numerical Study on Growth and Decay of Disturbance in a Flat-plate Boundary Layer

Shuta Noro, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi

The Sixth International Conference on Flow Dynamics　308-309　2009/11
共凝縮過程を伴うシリサイドナノ粒子形成のモデリング

茂田正哉, 渡辺隆行

化学工学会研究発表講演要旨集　2009　375-375　2009
Publisher: 公益社団法人化学工学会
DOI： 10.11491/scej.2009.0.375.0 　
S0502-3-4 Incompressible SPH Simulation of a Flow Field in an Arc Weld Pool

ITO Masumi, IZAWA Seiichiro, FUKUNISHI Yu, SHIGETA Masaya

The proceedings of the JSME annual meeting　2009　125-126　2009
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2009.2.0_125 　

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Flow in an arc weld pool was simulated by an incompressible SPH method including surface tension gradient force. Surface tension gradient force induced convection flows in the weld pool. Two different flow fields appeared depending on the temperature-dependence of the surface tension property. The temperature distribution was also affected by the surface tension.
S0504-4-5 Active Control of Cavity Noise using Vortex Generators

NISHIDA Hiroaki, SAKAMOTO Ryuzo, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

The proceedings of the JSME annual meeting　2009　209-210　2009
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2009.2.0_209 　

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An active control of the cavity noise is carried out by oscillating vortex generators. The vortex generators are designed to introduce streamwise vortices of alternate rotating directions into the shear layer. As a result, a maximum noise suppression effect that reaches 63 % of the cavity noise is achieved by oscillating the vortex generators.
Model integration for metal nanoparticle synthesis by an rf thermal plasma flow with counterflow cooling Peer-reviewed

Masaya Shigeta, Takayuki Watanabe

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B　75　(758)　2019-2028　2009
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/kikaib.75.758_2019 　

ISSN： 0387-5016
Incompressible SPH simulation of double-diffusive convection phenomena Peer-reviewed

Masaya Shigeta, Takahiro Watanabe, Seiichiro Izawa, Yu Fukunishi

International Journal of Emerging Multidisciplinary Fluid Sciences　1　(1)　1-18　2009
Publisher: Multi-Science Publishing Co. Ltd
DOI： 10.1260/1756-8315.1.1.1 　

ISSN： 1756-8315
Active control of cavity noise by fluidic oscillators Peer-reviewed

Shigeta M, Miura T, Izawa S, Fukunishi Y

Theoretical and Applied Mechanics Japan　57　127-134　2009

DOI： 10.11345/nctam.57.127 　

ISSN： 1348-0693

eISSN： 1349-4244
SUPPRESSION OF CAVITY NOISE BY CONTROLLING THE SPANWISE PHASE OF THE SEPARATING FLOW Invited Peer-reviewed

Yu Fukunishi, Masaya Shigeta, Seiichiro Izawa

Proc. 2nd International Conference on Jets, Wakes and Separated Flows　CDROM　5　2008/09
SUPPRESSION OF CAVITY NOISE BY FLUIDIC OSCILLATORS Peer-reviewed

Seiichiro Izawa, Toshimasa Miura, Masaya Shigeta, Yu Fukunishi

Proceedings of the 2nd International Conference on Jets, Wakes and Separated Flows　1-5　2008/06
Two-dimensional analysis of nanoparticle formation in induction thermal plasmas with counterflow cooling Peer-reviewed

Masaya Shigeta, Takayuki Watanabe

THIN SOLID FILMS　516　(13)　4415-4422　2008/05

DOI： 10.1016/j.tsf.2007.10.022 　

ISSN： 0040-6090
Numerical investigation of cooling effect on platinum nanoparticle formation in inductively coupled thermal plasmas Peer-reviewed

Masaya Shigeta, Takayuki Watanabe

JOURNAL OF APPLIED PHYSICS　103　(7)　2008/04

DOI： 10.1063/1.2903918 　

ISSN： 0021-8979
333 The Relation between Interface Characteristics and Mixing Enhancement in a Small-scale Channel

NORO Shuta, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

The proceedings of the JSME annual meeting　2008　65-66　2008
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2008.8.0_65 　

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The purpose of this study is to find a method to accomplish rapid mixing in a small-scale channel. The relation between interface characteristics and mixing enhancement in a small-scale is investigated by an experiment and a numerical simulation. By comparing the results of the experiment to those of two-dimensional and three-dimensional numerical simulations, it is shown that it is essential to threat the flow field as three-dimensional. It is also shown that the interface length does not always predict the mixing enhancement, and it is important to stretch the interface where the concentration gradient is high.
2712 Suppression of cavity noise by intermittent jets with spanwise phase difference

MIURA Toshimasa, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

The proceedings of the JSME annual meeting　2008　105-106　2008
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2008.7.0_105 　

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The purpose of this study is to create an energy efficient active control device that can suppress the cavity noise. New control devices using a plate-mounted rotating cylinder or fluidic oscillators are developed and their noise suppression effects are evaluated under conditions when the oncoming boundary layer is laminar or turbulent. The experiment is conducted in a low-turbulence wind tunnel and the devices are installed at the center of upstream edge of the cavity. These devices are designed to generate intermittent jets. It is found that the device using a plate-mounted rotating cylinder provides effective noise suppression for the turbulent separating flow case. In addition, it is shown that the peak cavity noise can be completely suppressed by the single-fluidic device for a laminar separating flow case. In a turbulent separating flow case, it is shown that it is necessary to install two fluidic devices side by side at the upper-edge of the cavity, in order to effectively reduce the cavity noise.
Mixing Enhancement and Interface Characteristics in a Small-Scale Channel, Peer-reviewed

Shuta NORO, Kenji KOKUNAI, Masaya SHIGETA, Seiichiro IZAWA, Yu FUKUNISHI

Journal of Fluid Science and Technology　3　(8)　1020-1030　2008
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jfst.3.1020 　

ISSN： 1880-5558

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The interface characteristics in a millimeter-scale channel are investigated in order to find a technique to speed up fluid mixing. The channel is fabricated on an acrylic-resin plate, where a cavity is attached in the downstream region of a T-shaped conduit. The mixing effect is evaluated using a blue dye and a colorless liquid, which are alternately injected into the channel by two syringe pumps. The important factors for highly efficient mixing under the combination of alternate inflow and cavity are investigated. Two-dimensional and three-dimensional numerical simulations are also performed, and the results are compared those of the experiment. It is confirmed that the fractal dimension and interface length inside a cavity can be used as indicators to predict the mixing level in the downstream region, although they are not perfect. The importance of focusing on both the stretching rate of the interface and the concentration gradient where the stretching of the interface occurs is presented.
Growth mechanism of silicon-based functional nanoparticles fabricated by inductively coupled thermal plasmas Peer-reviewed

M. Shigeta, T. Watanabe

JOURNAL OF PHYSICS D-APPLIED PHYSICS　40　(8)　2407-2419　2007/04

DOI： 10.1088/0022-3727/40/8/S20 　

ISSN： 0022-3727
Multi-component co-condensation model of Ti-based boride/silicide nanoparticle growth in induction thermal plasmas Peer-reviewed

Masaya Shigeta, Takayuki Watanabe

THIN SOLID FILMS　515　(9)　4217-4227　2007/03

DOI： 10.1016/j.tsf.2006.02.042 　

ISSN： 0040-6090
Modeling of non-equilibrium argon-hydrogen induction plasmas under atmospheric pressure Peer-reviewed

Takayuki Watanabe, Nobuhiko Atsuchi, Masaya Shigeta

THIN SOLID FILMS　515　(9)　4209-4216　2007/03

DOI： 10.1016/j.tsf.2006.02.100 　

ISSN： 0040-6090
1709 Numerical Simulation of a MHD Flow Using a SPH Method

HARATA Yoshiteru, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

The proceedings of the JSME annual meeting　2007　333-334　2007
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2007.2.0_333 　

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Hartmann flows are simulated by a SPH method in which Lorentz force is taken into account. A Hartmann flow is observed when an uniform transverse magnetic field is imposed on a liquid metal MHD flow. The numerical results show a qualitative good agreement with the theoretical solutions.
1537 Active Control of Cavity Noise Utilizing Fluidic Oscillator

MIURA Toshimasa, Maehara Shota, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

The proceedings of the JSME annual meeting　2007　167-168　2007
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2007.2.0_167 　

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An active control of aerodynamic noise generated by flow over a cavity is attempted using a fluidic type controling device. As a result, it is found that the maximum noise suppression effect reaches 60% of the cavity noise.
Study on Laminar/Turbulent Streamwise Interfaces in a Boundary Layer Flow

Osamu Terashima, Yusuke Miki, Seiichiro Izawa, Masaya Shigeta, Yu Fukunishi

JAXA Special Publication　SP06-013　73-76　2007
Two-temperature chemically-non-equilibrium modeling of argon induction plasmas with diatomic gas Peer-reviewed

Takayuki Watanabe, Masaya Shigeta, Nobuhiko Atsuchi

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER　49　(25-26)　4867-4876　2006/12

DOI： 10.1016/j.ijheatmasstransfer.2006.05.039 　

ISSN： 0017-9310
Numerical investigation of a local oxygen injection effect on argon induction plasmas using a chemically non-equilibrium model Peer-reviewed

Masaya Shigeta, Nobuhiko Atsuchi, Takayuki Watanabe

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN　39　(12)　1255-1264　2006/12

DOI： 10.1252/jcej.39.1255 　

ISSN： 0021-9592
Modeling of non-equilibrium argon-oxygen induction plasmas under atmospheric pressure Peer-reviewed

N Atsuchi, M Shigeta, T Watanabe

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER　49　(5-6)　1073-1082　2006/03

DOI： 10.1016/j.ijheatmasstransfer.2005.07.052 　

ISSN： 0017-9310
Numerical analysis for preparation of silicon-based intermetallic nano-particles in induction thermal plasma flow systems Peer-reviewed

Masaya Shigeta, Takayuki Watanabe

JSME International Journal, Series B: Fluids and Thermal Engineering　48　(3)　425-431　2006/02/15

DOI： 10.1299/jsmeb.48.425 　

ISSN： 1340-8054
4036 Analysis of Instability Modes in a Boundary Layer by a Spectral Method

SASAKI Kazuya, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

The proceedings of the JSME annual meeting　2006　401-402　2006
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2006.2.0_401 　

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The purpose of this study is to develop a new analytic method that can provide local growth rate of any mode, and estimate the transition point. Growth of a disturbance in a flat plate boundary layer is investigated by a spectral method. The neutral stability curve obtained by the new method is shifted to a higher wave number direction, compared to the conventional linear stability theory.
3729 Active Control of Cavity Noise by a Device Utilizing Resonance

MAEHARA Shouta, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

The proceedings of the JSME annual meeting　2006　85-86　2006
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2006.7.0_85 　

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An active flow control to reduce the aerodynamic noise generated by a flow over a cavity is attempted, using a device which consists of a loudspeaker and a resonator. Only the phases of operating signals for the speakers are changed when the fluctuations from the leading edge of the cavity, which are 180 degrees out-of-phase in the spanwise direction. As a result, the maximum noise reduction 20dB is achieved.
2217 Numerical Simulation of a Double-Diffusive Convection Field Using a Incompressible SPH Method

WATANABE Takahiro, SHIGETA Masaya, Izawa Seiichiro, FUKUISHI Yu

The proceedings of the JSME annual meeting　2006　7-8　2006
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2006.2.0_7 　

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Double-diffusive finger convection known as salt finger is simulated by the SPH method. The algorithms for the temperature and salinity diffusions are added to the SPH method extended for the incompressible flow computation. It is shown that the growth of salt finger can be simulated by SPH.
Experimental study of borders around an isolated turbulent region generated inside a flat-plate boundary layer

Yusuke Miki, Osamu Terashima, Masaya Shigeta, Seiichiro Izawa, Yu Fukunishi

Proceedings of Japan Society of Fluid Mechanics Annual Meeting　AM06-11-021　2006
Numerical analysis of metallic nanoparticle synthesis using RF inductively coupled plasma flows Peer-reviewed

M Shigeta, H Nishiyama

JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME　127　(11)　1222-1230　2005/11

DOI： 10.1115/1.2039106 　

ISSN： 0022-1481
Numerical analysis for co-condensation processes in silicide nanoparticle synthesis using induction thermal plasmas at atmospheric pressure conditions Peer-reviewed

M Shigeta, T Watanabe

JOURNAL OF MATERIALS RESEARCH　20　(10)　2801-2811　2005/10

DOI： 10.1557/JMR.2005.0351 　

ISSN： 0884-2914
2温度モデルによる反応性高周波熱プラズマの数値解析

渡辺隆行, 厚地伸彦, 茂田正哉

化学工学会研究発表講演要旨集　2005　484-484　2005
Publisher: 公益社団法人化学工学会
DOI： 10.11491/scej.2005.0.484.0 　
Numerical investigation for nano-particle synthesis in an RF inductively coupled plasma Peer-reviewed

M Shigeta, T Watanabe, H Nishiyama

THIN SOLID FILMS　457　(1)　192-200　2004/06

DOI： 10.1016/j.tsf.2003.12.020 　

ISSN： 0040-6090
Computational simulation of a particle-laden RF inductively coupled plasma with seeded potassium Peer-reviewed

M Shigeta, T Sato, H Nishiyama

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER　47　(4)　707-716　2004/02

DOI： 10.1016/j.ijheatmasstransfer.2003.08.007 　

ISSN： 0017-9310
Computer Simulation of Nano Metallic-Particle Synthesis in an Advanced RF Inductively Coupled Plasma Peer-reviewed

M. Shigeta, H. Nishiyama

Abstract of The 3rd International Symposium on Slow Dynamics in Complex Systems　92　2003/11
Numerical Analysis of a Nano-Particle Synthesis by an RF Inductively Coupled Plasma

M. Shigeta, T. Watanabe, H. Nishiyama

JSMF Annual Meeting 2003　177-178　2003/07
Numerical Simulation of a Potassium-seeded RF Inductively Coupled Plasma with Particles Peer-reviewed

M. Shigeta, T. Sato, H. Nishiyama

Abstracts of Joint International Plasma Symposium of 6th APCPST, 15th SPSM, OS2002 & 11th KAPRA　109　2003/07
Numerical simulation of a potassium-seeded turbulent RF inductively coupled plasma with particles Peer-reviewed

M Shigeta, T Sato, H Nishiyama

THIN SOLID FILMS　435　(1-2)　5-12　2003/07

DOI： 10.1016/S0040-6090(03)00366-3 　

ISSN： 0040-6090
Numerical Investigation for Nano-Particle Synthesis in an RF Inductively Coupled Plasma

M. Shigeta, T. Watanabe, H. Nishiyama

Abstracts of The 16th Symposium on Plasma Science for Materials　105　2003/06
Numerical Simulation of In-flight Particle Processing in an Advanced Inductively Coupled Plasma Flow Peer-reviewed

M. Shigeta, T. Sato, H. Nishiyama

Proceedings of International Symposium on Innovative Materials Processing by Controlling Chemical Reaction Field, Zao　48-51　2002/11
Numerical Simulation of a Particle-laden RF Inductively Coupled Plasma with Functional Enhancement Peer-reviewed

M. Shigeta, T. Sato, H. Nishiyama

Proceedings of the 5th JSME/KSME Fluids Engineering Conference, Nagoya　868-873　2002/11
微粒子を含む反応性ＲＦプラズマ流の数値シミュレーション

茂田正哉, 西山秀哉

日本混相流学会年会講演会2002講演論文集　113-114　2002/07
Numerical simulation of an RF inductively coupled plasma for functional enhancement by seeding vaporized alkali metal Peer-reviewed

H Nishiyama, M Shigeta

EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS　18　(2)　125-133　2002/05

DOI： 10.1051/epjap:2002034 　

ISSN： 1286-0042
Numerical Simulation of the Functionalization for the Radio Frequency Inductively Coupled Plasma Peer-reviewed

M. Shigeta, H. Nishiyama

Proc. of the 15th Int. Symp. on Plasma Chemistry　Ⅲ　1209-1214　2001/07
高周波誘導プラズマ流の高機能化のための数値シミュレーション

西山秀哉, 茂田正哉

日本機械学会東北支部第36期総会・講演会講演論文集　(011-1)　62-63　2001/03
Mixing and magnetic effects on a nonequilibrium argon plasma jet Peer-reviewed

T Sato, M Shigeta, D Kato, H Nishiyama

INTERNATIONAL JOURNAL OF THERMAL SCIENCES　40　(3)　273-278　2001/03

DOI： 10.1016/S1290-0729(00)01217-5 　

ISSN： 1290-0729
磁場下のプラズマジェットの混合効果

西山秀哉, 佐藤岳彦, 茂田正哉, 加藤大悟

プラズマ・核融合学会第16回年会予稿集　(16)　99-99　1999/11
Publisher:

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Misc. 118

熱プラズマ流動シミュレーション ― 熱プラズマ誘発乱流が関係するナノ粒子生成およびアーク消弧プロセス ― Invited Peer-reviewed

茂田正哉

化学工学　88　(12)　590-594　2024/12
Computational plasma fluid mechanics: mathematics and physics of fluid for plasma manufacturing processes Invited Peer-reviewed

Masaya Shigeta

JSAP Review　2024　240417-1-240417-5　2024/12

DOI： 10.11470/jsaprev.240417 　
計算プラズマ流体工学－プラズマものづくりプロセスを流体の数理から－ Invited Peer-reviewed

茂田正哉

応用物理　93　(10)　586-590　2024/10
プラズマ熱物性データを組み込んだ高温材料プロセスの数理モデリングとシミュレーション Invited

茂田正哉

熱物性　38　(2)　56-60　2024/05
Development of Ultra-Narrow Gap Submerged Arc Welding Invited

Yohei ABE, Takahiro FUJIMOTO, Mitsuyoshi NAKATANI, Masaya SHIGETA, Manabu TANAKA

JOURNAL OF THE JAPAN WELDING SOCIETY　92　(2)　105-110　2023
Publisher: Japan Welding Society
DOI： 10.2207/jjws.92.105 　

ISSN： 0021-4787

eISSN： 1883-7204
高能率・高品質エレクトロスラグ溶接法の開発（第3報）

浅野涼, 山崎圭, 山口幸祐, 柿崎智紀, 戸田亮, 齋藤康之, 茂田正哉, 田中学

（一社）溶接学会 2022年度春季全国大会　A-3-1　2022/04
Mathematical Descriptions and Numerical Predictions of Thermal Plasma – Nanopowder Production Systems Invited

Masaya Shigeta

Proceedings of The 12th Asia-Pacific International Symposium on the Basics and Applications of Plasma Technology　O4-1　2021/12
高エンタルピープラズマ流動場を利用したナノ粒子大量創製プロセスにおける諸現象のモデリングと数値計算法の研究 Invited Peer-reviewed

茂田正哉

スマートプロセス学会誌　10　(1)　32-37　2021/01
第II部溶接・接合工学の最近の動向, I 溶接法研究委員会 Invited

浅井知, 宮坂史和, 野村和史, 荻野陽輔, 田中学, 茂田正哉, 山根敏

溶接学会誌　89　(5)　38-51　2020/04
アーク溶接現象解明に向けた最先端診断・数値熱流体解析 Invited Peer-reviewed

茂田正哉, 田中学

電気学会誌　140　(6)　350-353　2020/04
熱プラズマ流によるナノ粒子量産プロセスにおける諸現象のモデリングと数値計算法の研究 Invited

茂田正哉

生産と技術　72　(1)　87-90　2020/04
Investigation of light emitting mechanism near electrode for prediction of tungsten electrode consumption

田中慶吾, 茂田正哉, 田中学

材料とプロセス(CD-ROM)　33　(2)　2020

ISSN： 1882-8922
溶接プロセスのシミュレーションの活用法って何？の巻 Invited

茂田正哉

日本溶接協会WE-COMマガジン「浪速博士の溶接がってん！R」　(33)　2019/07
ティグ溶接中の金属蒸気輸送が電極の変形に及ぼす影響

田中慶吾, 茂田正哉, 田中学

材料とプロセス(CD-ROM)　32　(2)　2019

ISSN： 1882-8922
ティグ溶接中の金属蒸気輸送がタングステン電極消耗に与える影響

田中慶吾, 茂田正哉, 田中学

溶接学会全国大会講演概要(Web)　(105)　2019
ティグ溶接における金属蒸気輸送がタングステン電極の溶融・変形に及ぼす影響

田中慶吾, 茂田正哉, 田中学

スマートプロセス学会学術講演会講演概要　2019　2019
ティグ溶接中における電極内および気相中の添加物挙動の数値解析

山田哲生, 田中慶吾, 茂田正哉, 田中学

スマートプロセス学会学術講演会講演概要　2019　2019
アーク溶接プロセス中の溶融金属流動の粒子法シミュレーション Invited

茂田正哉

自動車技術　72　(10)　42-46　2018/04
アーク溶接という複雑な電磁熱流体現象を診る Invited Peer-reviewed

茂田正哉, 田中学

スマートプロセス学会誌　7　(1)　3-7　2018/02
ティグ溶接において電極付近に存在する発光領域と電極内添加物の関係

上野亮, 田中慶吾, 茂田正哉, 田中学

スマートプロセス学会総合学術講演会講演概要　2018　2018
高分解能イメージ分光分析システムを用いたティグ溶接中における金属蒸気輸送メカニズムの実験的検討

田中慶吾, 茂田正哉, 田中学

スマートプロセス学会総合学術講演会講演概要　2018　2018
ティグアークプラズマ中の金属蒸気輸送メカニズムの実験的検討

田中慶吾, 茂田正哉, 田中学

溶接学会全国大会講演概要(Web)　(103)　2018
Development of 3D Electromagnetic Thermal Fluid Simulation for Elucidation of Heat Transfer to Anode Affected by Lateral Gas (放電静止器開閉保護合同研究会・アークプラズマ・電気接点とその応用)

Maeda Yoshifumi, Yamamoto Shinji, Iwao Toru, Tashiro Shinichi, Shigeta Masaya, Tanaka Manabu

電気学会研究会資料. SP = The papers of technical meeting on switching and protecting engineering, IEE Japan　2017　(1)　41-44　2017/07/19
Publisher: 電気学会
GTA溶接におけるアークプラズマ中の金属蒸気挙動の可視化

田中慶吾, METHONG Titinan, 茂田正哉, 田中学

溶接学会全国大会講演概要(Web)　(100)　2017
GTA溶接におけるアークプラズマ中の金属蒸気挙動の観測

田中慶吾, METHONG Titinan, 茂田正哉, 田中学

スマートプロセス学会総合学術講演会講演概要　2017　2017
ガスタングステンアーク溶接におけるアークプラズマ中の金属蒸気挙動の実験観測

田中慶吾, 茂田正哉, 田中学

材料とプロセス(CD-ROM)　30　(2)　2017

ISSN： 1882-8922
ガスタングステンアーク溶接におけるプラズマ温度場の可視化

田中慶吾, METHONG Titinan, 茂田正哉, 田中学, MURPHY A. B.

溶接学会全国大会講演概要(Web)　(101)　2017
ティグ溶接におけるアークプラズマ中の金属蒸気挙動の解析

田中慶吾, 茂田正哉, 田中学

スマートプロセス学会総合学術講演会講演概要　2017　2017
アーク溶接における溶融金属流動の粒子法シミュレーション Invited Peer-reviewed

茂田正哉

溶接学会誌　86　(6)　14-20　2016/04
アーク溶接を観て診る―溶滴移行を決めるプラズマの質を測る― Invited

茂田正哉, 田中学

溶接技術　64　(2)　40-44　2016/04
B144 Numerical simulation of nanopowder production using a thermal plasma

Shigeta Masaya

Procee[d]ings of Thermal Engineering Conference　2015　"B144-1"-"B144-2"　2015/10/23
Publisher: The Japan Society of Mechanical Engineers

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Numerical simulation is performed for silicon nanopowder production by means of an argon thermal plasma jet. A simple model is developed to describe a collective growth and convective-diffusive transport of nanopowder. A high-temperature plasma flow which entrains ambient low-temperature gas is simulated successfully; and the spatial distributions and time evolutions of the nanoparticle concentration and mean volume diameter are also clarified. A large number of small nanoparticles are produced especially around the plasma. The regions where the nanopowder has large sizes almost correspond to those where the nanopowder shows low concentrations because the nanopowder grows by coagulation as well as condensation.
高速度カメラによるアーク溶接プロセスの観察とシミュレーション Invited Peer-reviewed

平田好則, 田中学, 茂田正哉, 野村和史, 荻野陽輔

溶接学会誌　84　(1)　19-24　2015/04
熱プラズマプロセッシングのモデリング Invited Peer-reviewed

茂田正哉

化学工学　78　(5)　317-321　2014/04
G0306 Numerical Simulation of a Deforming Liquid Body on a Solid Surface Using Incompressible SPH method

ITO Masumi, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

Fluids engineering conference ...　2013　"G0306-01"-"G0306-04"　2013/11/09
Publisher: The Japan Society of Mechanical Engineers
ISSN： 1348-0251

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The deformation of a water droplet on a solid wall is simulated by incompressible SPH method. The wettability of surface and the surface tension are modeled by giving attractive force between the particles. It is shown that the model can represent the difference of the wettability. The phenomenon where a droplet that touches the boundary between hydrophilic and hydrophobic surfaces is moved because of difference in the wettability is successfully simulated.
G0701 Promotion of Destabilization of a Boundary Layer Using Interaction Between Streaky Structures and Jet

YOSHIKAWA Joe, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

Fluids engineering conference ...　2013　"G0701-01"-"G0701-03"　2013/11/09
Publisher: The Japan Society of Mechanical Engineers
ISSN： 1348-0251

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Numerical simulation is carried out to investigate the destabilizing process of a boundary layer. The boundary layer is destabilized by a combination of streaky structures and short-duration jet ejection. Deformation of streaky structures can be observed when the jet velocity is high. However, the onset of turbulence cannot be observed in the computation.
608 Incompressible Fluid Analysis of Deep Cavity Flows including Acoustic Resonance Effect

ISAWA Hiroko, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2013　(49)　177-178　2013/09/20
Publisher: The Japan Society of Mechanical Engineers
609 Numerical Simulation on How the Velocity Fluctuation Waves are Generated by Piezoelectric Actuators

OKU Tatsuya, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2013　(49)　179-180　2013/09/20
Publisher: The Japan Society of Mechanical Engineers
G051046 Study on Feedforward Control of Instability Waves in a Boundary Layer

WAKAMATSU Hiroshi, OKAWA Hajime, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

Mechanical Engineering Congress, Japan　2013　"G051046-1"-"G051046-4"　2013/09/08
Publisher: The Japan Society of Mechanical Engineers

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An improvement of the digital noise filter is attempted aimed at improving the system for the feedforward control of instability waves in a transitional flat-plate boundary layer. The older control method using the Chebyshev type filter had difficulty controlling the instability waves of plural frequencies. An Inverse Chebyshev type filter is adopted as a noise filter and its characteristics are compared to the Chebyshev type filter. The results show that the Inverse Chebyshev filter can ease the deformation of wave signals compared to the Chebyshev type filter.
S054053 Boundary Layer Receptivity to Localized External Disturbances Generated by a 2D Airfoil with Jets

HIROTA Hayato, KATO Tasuku, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

Mechanical Engineering Congress, Japan　2013　"S054053-1"-"S054053-5"　2013/09/08
Publisher: The Japan Society of Mechanical Engineers

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The effect of localized external disturbances on the receptivity of a fla plate boundary layer is investigated by a wind tunnel experiment. The disturbances are introduced in the free stream using the combination of the optimally designed airfoil and the jet ejections from the trailing edge. The experimental results show that the velocity fluctuatio in the boundary layer grows up rapidly when the disturbances comes close to the outer edge of the boundary layer. When the jet is pulsated at 10 Hz and 30 Hz, the velocity fluctuation of the same frequency is observed in the boundary layer.
170 Numerical Simulation of Flow around a Corrugated Airfoil by Two-Dimensional Discrete Vortex Method

LI Yixing, YOSHIKAWA Joe, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2013　(48)　142-143　2013/03/15
Publisher: The Japan Society of Mechanical Engineers
142 A Redistribution Model Focused on Continuity of Circulation for Three-Dimensional Vortex Method

SATO Hidenori, SHIGETA Masaya, FUKUNISHI Yu, IZAWA Seiichiro

2013　(48)　86-87　2013/03/15
Publisher: The Japan Society of Mechanical Engineers
141 Development and Validation of Turbulence Generator using Mass Transportation by Vortex Rings

HAYASHI Hiroki, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2013　(48)　84-85　2013/03/15
Publisher: The Japan Society of Mechanical Engineers
140 Design of an Airfoil near Wall with Limited Influence to the Wall Surface using Genetic Algorithm

OKA Tomonari, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2013　(48)　82-83　2013/03/15
Publisher: The Japan Society of Mechanical Engineers
139 Measuremant of Flow Field around Saw-tooth Shaped Airfoil using Gust Wind Tunnel

TANABE Yoko, SHIGETA Masaya, IZAWA Seiichiro, FUKUHISHI Yu

2013　(48)　80-81　2013/03/15
Publisher: The Japan Society of Mechanical Engineers
137 SPH Simulation of a Collapsing Cavitation Bubble

Kobayashi Yoshihisa, SHIGETA Masaya, IZAWA Seiichiro, FUKUHISHI Yu

2013　(48)　76-77　2013/03/15
Publisher: The Japan Society of Mechanical Engineers
G620 Numerical Simulation of Scattered Fluid by Three-dimensional SPH Method.

ITO Takuya

Fluids engineering conference ...　2012　563-564　2012/11/16
Publisher: The Japan Society of Mechanical Engineers
ISSN： 1348-0251

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A liquid film flow on a rotating disk and the scattering behavior are simulated using a three-dimensional incompressible SPH (Smoothed Particle Hydrodynamics) method. The liquid film simply flows out when the rotation is slow, whereas the liquid film breaks up to thin lines and eventually to numerous droplets when the rotation is fast. Those numerical results of the scattering liquid show good agreements with the experimental results. However, the effect of the size of the disk cannot be observed when the disk size is large due to not enough resolutions.
G610 Numerical Simulation of Gas Flow Accompanying Thermal Expansion Using Particle Method

ITO Masumi, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

Fluids engineering conference ...　2012　543-544　2012/11/16
Publisher: The Japan Society of Mechanical Engineers
ISSN： 1348-0251

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A thermally-expanding gas flow accompanying significant changes in both temperature and density is simulated using SPH method. Thermal expansion is modeled by changing the diameters of particles according to their temperatures. A convective flow whose local temperature varies, ranging from 300 K to 3,000 K, is successfully simulated.
211 Measurement of Unsteady Low-Reynolds Number Flows around Corrugated Airfoil of a Dragonfly

AOYAGI Wataru, Ian Kesniel Panelo Esberto, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2012　(48)　64-65　2012/09/22
Publisher: The Japan Society of Mechanical Engineers
210 Generation of Low-Speed Meandering Streak Using a Small Piece of Screen Oscillating in Spanwise Direction

TAKAHASHI Tadashi, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2012　(48)　62-63　2012/09/22
Publisher: The Japan Society of Mechanical Engineers
S051024 Measurement of Flow Field around Airfoil of Vertical Axis Wind Turbine

SHODA Tatsuya, UEDA Yuko, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

Mechanical Engineering Congress, Japan　2012　"S051024-1"-"S051024-5"　2012/09/09
Publisher: The Japan Society of Mechanical Engineers

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Flow fields around an airfoil of a straight-wing vertical-axis wind turbine are measured using a PIV method to obtain a design guide for a more efficient wind turbine. The result shows that the flow field changes dramatically along with the tip speed ratio. High speed regions are generated near the airfoil because the flow must go around the airfoil, and the flow separation causes a part of fluid to accelerate and move with the airfoil. The timing of vortex shedding related to the flow separation is delayed when the tip speed ratio is high.
S053062 Detection and Active Control of Unsteadily Separating Flows Using Tuft Method

ENDO Takuo, HAYASHI Tomoki, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

Mechanical Engineering Congress, Japan　2012　"S053062-1"-"S053062-4"　2012/09/09
Publisher: The Japan Society of Mechanical Engineers

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A separation control system using a flap, tufts, and image processor is developed and its control performance is evaluated against strongly unsteady separating flows. The flap-control system only works when a separation is detected from the movement of the tufts. The results show that the control system can successfully delay the flow separation.
S052011 Numerical Study of Receptivity to Freestream Disturbances for Case of an Elliptic Leading Edge

NISHIO Yu, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

Mechanical Engineering Congress, Japan　2012　"S052011-1"-"S052011-5"　2012/09/09
Publisher: The Japan Society of Mechanical Engineers

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A relation between the vorticity disturbances and the leading edge receptivity is investigated numerically. Freestream disturbances are given as a two-dimensional periodic vorticity fluctuation at the upstream boundary. Three cases changing the height of the impinging vortices are tested. The result shows that location of the impinging vorticity pattern influence the vorticity pattern near the wall of the boundary layer, changing the receptivity.
S055022 Time-Dependent Three-Dimensional Simulation of a DC-RF Hybrid Plasma Flow

SHIGETA Masaya

Mechanical Engineering Congress, Japan　2012　"S055022-1"-"S055022-4"　2012/09/09
Publisher: The Japan Society of Mechanical Engineers

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Time-dependent 3-D simulation based on a large eddy simulation (LES) is successfully performed to clarify the complex thermofluid field and coherent structure of multi-scale vortices in a direct current - radio frequency (DC-RF) hybrid thermal plasma torch. The high temperature region has a large scale vortex structure, whereas the low temperature flow forms small eddies. The present simulation also yields reasonable results for vortex generation and unstable behavior at the interface between the high temperature plasma and the low temperature gas flows.
J051056 SPH Simulation of Solid Body Washed Away by Liquid Flow

HARA Tomohiro, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

Mechanical Engineering Congress, Japan　2012　"J051056-1"-"J051056-5"　2012/09/09
Publisher: The Japan Society of Mechanical Engineers

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The behavior of a solid body washed away by a rushing flow was simulated by a three-dimensional incompressible SPH method. The results showed a reasonable behavior of the body which changes by the body's shape, weight, or surface facing the oncoming flows.
130 Analysis of Flow Separation Phenomena

YOSHIKAWA Joe, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2012　(47)　66-67　2012/03/13
Publisher: The Japan Society of Mechanical Engineers
125 Measurement of Unsteady Flow around an Airfoil at Low Reynolds Numbers

AOYAGI Wataru, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2012　(47)　56-57　2012/03/13
Publisher: The Japan Society of Mechanical Engineers
126 SPH Simulation of the Mixing Process in a Gas-Liquid Jet

WADA Yasunori, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2012　(47)　58-59　2012/03/13
Publisher: The Japan Society of Mechanical Engineers
127 SPH Simulation of Solid-Liquid Two Phase System under Vibration

HIROTA Hayato, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2012　(47)　60-61　2012/03/13
Publisher: The Japan Society of Mechanical Engineers
G050093 Three-Dimensional SPH Simulation of a Tire Rolling on a Wet Road

TADA Shunei, SATAKE Masatoshi, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

Mechanical Engineering Congress, Japan　2011　"G050093-1"-"G050093-5"　2011/09/11
Publisher: The Japan Society of Mechanical Engineers

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Water splash caused by an elastic tire rolling on a wet road is simulated using SPH method. Fluid-structure inter action model is newly proposed to couple the fluid motion and the elastic tire. The result shows that the water discharge capability strongly depends on the grooved patterns, and the tire receives lift and drag forces from the water.
S054032 Measurement and Control of Separating Flow with a Large Oscillation of the Separation Point

HAYASHI Tomoki, OE Hiromasa, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

Mechanical Engineering Congress, Japan　2011　"S054032-1"-"S054032-4"　2011/09/11
Publisher: The Japan Society of Mechanical Engineers

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A periodically and unsteadily separating flow with a separation bubble is excited on a flat plate by periodically changing the opening angle of the ceiling. The passive control device, which consists of two flaps connected to each other by a link mechanism, aimed at suppressing the separation bubble is tested. The control effect is evaluated by measuring the flow field using a direction sensitive probe. The experimental results show that the device is capable to decrease the size of the separating region.
198 Improvement of the Efficiency of Active Control Using Piezoelectric Actuators Aimed at Delaying the Boundary Layer Transition

KONDO Shigenori, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2011　(46)　198-199　2011/03/15
Publisher: The Japan Society of Mechanical Engineers
110 Difference in the Flow Characteristics by a Small Prismatic Bump at the Bottom of the Cavity

NISHI Yoichiro, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2011　(46)　24-25　2011/03/15
Publisher: The Japan Society of Mechanical Engineers
112 Investigation of a Flow around a Body in a Gust Wind Tunnel

SUGIURA Keitaro, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2011　(46)　28-29　2011/03/15
Publisher: The Japan Society of Mechanical Engineers
105 Experimental Study of the Flow Field around a Straight-Wing Vertical-Axis Wind Turbine Model

SHODA Tatsuya, SATO Yuko, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2011　(46)　14-15　2011/03/15
Publisher: The Japan Society of Mechanical Engineers
106 Effect of Shear Flow on a Vortex Tube Generated between a Flat Plate and Rotating Body

ITO Takuya, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2011　(46)　16-17　2011/03/15
Publisher: The Japan Society of Mechanical Engineers
111 SPH Simulation of Material Particle Transportation Process in the Supersonic Nozzle of a Cold Spray

TAKAHASHI Tadashi, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2011　(46)　26-27　2011/03/15
Publisher: The Japan Society of Mechanical Engineers
深海カルデラ内の熱水活動によって誘起される流れの数値解析 (複雑流体の数理解析と数値解析)

小紫誠子, 大西楢平, 茂田正哉, 福西祐

数理解析研究所講究録　1724　118-125　2011/01
Publisher: 京都大学
ISSN： 1880-2818
0130 Control of Flow with an Oscillating Separating Point

OE Hiromasa, TERAMOTO Shota, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

Fluids engineering conference ...　2010　65-66　2010/10/29
Publisher: The Japan Society of Mechanical Engineers
ISSN： 1348-2882

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A periodically separating flow is artificially generated on a flat plate and an attempt to control the flow by adding a feedback loop beneath the plate is carried out. The results show that the control device has a capability to suppress the periodical separation.
213 Generation of Turbulent Spots in an Environment with Streaky Structure

UEHARA Masato, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2010　(46)　57-58　2010/09/24
Publisher: The Japan Society of Mechanical Engineers
207 Simulation of Stream of People Using SPH Method with Autonomous Particle Model

KADO Shunsuke, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2010　(45)　214-215　2010/03/12
Publisher: The Japan Society of Mechanical Engineers
202 Flow Measurement around a Straight-Wing Vertical-Axis Wind Turbine

OKAZAKI Hiroshige, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu, SATO Yuko

2010　(45)　204-205　2010/03/12
Publisher: The Japan Society of Mechanical Engineers
208 Numerical Study on the Effect of Inserting Thin Plate Inside a Cavity

OHASHI Yusuke, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2010　(45)　216-217　2010/03/12
Publisher: The Japan Society of Mechanical Engineers
203 Effect of Flow Generated by Wall Impingement of Small Flat Plate on a Body on the Wall

TADA Shuhei, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2010　(45)　206-207　2010/03/12
Publisher: The Japan Society of Mechanical Engineers
Simulation of Hydrothermal Convection in a Submarine Caldera

Komurasaki Satoko, Ohnishi Shuhei, Shigeta Masaya, Fukunishi Yu

2010　37-37　2010
Publisher: 日本流体力学会

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In order to investigate the material advection and diffusion driven by submarine hydrothermal plumes, the hydrothermal convection in a submarine caldera was studied by a numerical simulation. The incompressible Navier-Stokes equations were solved by the multidirectional finite-difference method. A third-order upwind scheme was employed in the convective terms to stabilize the computation. The second-order Crank-Nicolson implicit scheme was used for time integration. The flow was simulated using a grid fitted to the topography of the caldera. Results of the computation were visualized and submarine flow fields under some different initial conditions in temperature were analyzed.
Receptivity of Boundary Layer to Local and Intermittent Disturbances Given in Freestream

WATANABE Toru, KANEKO Masaki, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2010　21-21　2010
Publisher: 日本流体力学会

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Intermittent disturbances, generated by collisions of six vortex rings, were introduced into the uniform flow outside a flat plate boundary layer, and the receptivity of the boundary layer to these disturbances was investigated. The patterns of high- and low-speed regions appearing inside a boundary layer depended on the colliding orders of the vortex rings, while the patterns of random velocity fluctuation regions did not. It was also found that lower frequency components begin to grow in the beginning, followed by the growth of higher frequency components.
Prediction of Transition Point by Pursuing Local Growth of Instability Waves

GOIT Jay Prakash, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2010　247-247　2010
Publisher: 日本流体力学会

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Stability of a flat-plate boundary layer and flow transition on a wing is investigated using spectral and finite difference methods. For the flat-plate boundary layer the results agree well with the linear stability theory; however the non parallel effect cannot be observed. Predicted values of the transition point on NACA0015 aerofoil are close to the experimental results.
0135 Control of Flow on a Flat Plate with an Oscillating Separation Point

TERAMOTO Shota, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

Fluids engineering conference ...　2009　71-72　2009/11/06
Publisher: The Japan Society of Mechanical Engineers
ISSN： 1348-2882

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The flow separation on a flat plate under adverse pressure gradient was investigated by flow visualization. The strength of pressure gradient was adjusted by changing the angle of the ceiling plate. The results showed that the location of the separation bubble moved upstream by the increase in the adverse pressure gradient.
0210 Interface Structures between Laminar and Turbulent Regions in a Flat-plate Boundary Layer

KUSANO Shin-ichiro, Shigeta MASAYA, IZAWA Seiichiro, FUKUNISHI Yu

Fluids engineering conference ...　2009　113-114　2009/11/06
Publisher: The Japan Society of Mechanical Engineers
ISSN： 1348-2882

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The streamwise interface between laminar and turbulent regions is experimentally investigated. Piezo ceramic actuators were used to introduce a turbulent region into the flat-plate boundary layer. A flow visualization experiment was carried out to investigate the flow structure at the laminar/turbulent interface. The spanwise correlations of velocity fluctuations inside the calmed region were obtained by applying the conditional sampling technique with an ensemble-averaged method. The results showed that the spanwise correlations are influenced by the frequency bandwidths of the filtered velocity fluctuations.
302 Effect of Contact Area Configuration on Landing of a Vortex Generated by a Rotating Body

OGUMA Yusuke, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2009　(45)　75-76　2009/09/26
Publisher: The Japan Society of Mechanical Engineers
306 Two-Dimensional Incompressible SPH Simulation of Flowing and Freezing Drops

AGAWA Masanori, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2009　(45)　83-84　2009/09/26
Publisher: The Japan Society of Mechanical Engineers
307 Three-Dimensional Incompressible SPH Simulation of a Droplet Behavior

HONGO Takuya, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2009　(45)　85-86　2009/09/26
Publisher: The Japan Society of Mechanical Engineers
109 Numerical Simulation of Material Transport in a Supersonic Flow Using SPH Method

UEHARA Masato, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2009　(44)　18-19　2009/03/13
Publisher: The Japan Society of Mechanical Engineers
196 Design of a Small Gust Wind Tunnel

GOIT Jay Prakash, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2009　(44)　184-185　2009/03/13
Publisher: The Japan Society of Mechanical Engineers
197 Generation of secondary flow by a wall impingement of small flat plate and its interaction with a body on the wall

KUSUNOKI Kazuo, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2009　(44)　186-187　2009/03/13
Publisher: The Japan Society of Mechanical Engineers
209 Numerical Simulation of a Flow Field with Solid-Liquid Phase Transition Using a Particle Method

ITO Masumi, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2009　(44)　210-211　2009/03/13
Publisher: The Japan Society of Mechanical Engineers
Proposition of an Index of Flow Instability Focused on Vorticity Distribution

Izawa Seiichiro, Nara Ryu, Shigeta Masaya, Fukunishi Yu

2009　287-287　2009
Publisher: 日本流体力学会

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The instability of 2D/3D counter-current flows was evaluated by two models focused on vortex motions. One is based on the vorticity budget caused by advection and diffusion. The other is new model deduced from the analogy between the variation of vorticity patterns and moment in the center-of-mass system. Both models showed good agreement with the neutral stability theory for 2D flows and the latter was consistent with the numerical results for 3D flows.
Effect of Outer Disturbances on the Transition of a Flat-plate Boundary Layer

KANEKO Masaki, SUZUKI Yoshimune, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2009　161-161　2009
Publisher: 日本流体力学会

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Two vortex rings were introduced into the uniform flow outside a boundary layer and their effect on the transition was investigated. High- and low- speed regions appear inside a boundary layer aligned in the streamwise direction. The high speed region becomes turbulent downstream.
Feedforward Control of Instability Waves in a Flat-Plate Boundary Layer using Piezo Actuators

OKAWA Hajime, WATANABE Michiharu, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2009　164-164　2009
Publisher: 日本流体力学会

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A feedforward control of instability waves in a transitional flat-plate boundary layer is carried out using arrays of piezo-ceramic actuators and hot-wire sensors. The instability waves were excited by a combination of a roughness element on the flat-plate and acoustic forcing emitted from loudspeaker inside the settling chamber of a wind tunnel. The amplitude of instability waves with a single frequency component could be reduced by the feedforward control. It was also effective against waves with two frequency components.
307 The Effect of External Local Disturbances on a Flat-Plate Boundary Layer

SUZUKI Yoshimune, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2008　(44)　87-88　2008/09/27
Publisher: The Japan Society of Mechanical Engineers
305 Study of a New Indicator for Prediction of Flow Instability

NARA Ryu, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2008　(44)　83-84　2008/09/27
Publisher: The Japan Society of Mechanical Engineers
304 Suppression of Cavity Noise by an Object Near the Cavity

SAKAMOTO Ryuzo, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2008　(44)　81-82　2008/09/27
Publisher: The Japan Society of Mechanical Engineers
306 Study of the Method to Predict Flow Instability Including a Nonlinear Effect

HORIKAWA Satoshi, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2008　(44)　85-86　2008/09/27
Publisher: The Japan Society of Mechanical Engineers
熱プラズマプロセスによるナノ粒子合成 Invited Peer-reviewed

渡辺隆行, 茂田正哉

応用物理　77　(9)　1098-1102　2008/04
206 The Behavior of a Vortex Tube Generated by a Rotating Body

OKAWA Hajime, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2008　(43)　213-214　2008/03/15
Publisher: The Japan Society of Mechanical Engineers
203 Numerical Simulation of the Behavior of a Vortex Generated between a Pair of Rotating Cylinders

TERAMOTO Shota, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu, KAWAMURA Tetuya

2008　(43)　207-208　2008/03/15
Publisher: The Japan Society of Mechanical Engineers
202 Study of Wind Noise Emitted from a Wet Rod

SATAKE Masatoshi, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2008　(43)　205-206　2008/03/15
Publisher: The Japan Society of Mechanical Engineers
Hierarchical Relation between Vortical Structures and Deformation Fields in a Turbulent Flow

IZAWA Seiichiro, KURIHARA Makoto, SHIGETA Masaya, FUKUNISHI Yu

2008　162-162　2008
Publisher: 日本流体力学会

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Hierarchical relation between the deformation fields and vortical structures in a homogeneous isotropic turbulence is investigated. Vortex motions of different scales are extracted using the Fourier lowpass filter. The stretching rates of the extracted vortical structures are evaluated by replacing the extracted vortical structures by vortex blobs. As a result, it is found that the individual vortices are likely to be stretched along the principal strain axes of the flow field of larger scales.
Application of Incompressible SPH Method to a Flow in an Arc Weld Pool

Shigeta Masaya, Harata Yoshiteru, Izawa Seiichiro, Fukunishi Yu

2008　91-91　2008
Publisher: 日本流体力学会

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Numerical simulation is conducted for a flow in an arc weld pool using an incompressible SPH method. The flow field driven by the shear stress or the Lorentz force is successfully simulated taking into account the heat transfer, the phase change, and the deformation of the free surface. When the shear stress works on the surface, the weld pool is spread outward. On the other hand, a deep weld pool is formed by the convection due to the Lorentz force when the Lorentz force is operated. These results indicate that the incompressible SPH method is applicable to numerical analysis of an arc weld pool.
The effect of outer disturbances on the transition of a flat-plate boundary layer

SUZUKI Yoshimune, OHNO Takurou, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2008　38-38　2008
Publisher: 日本流体力学会

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The effect of outer disturbances on the transition of a flat-plate boundary layer is studied using a disturbance-generating bar located outside the boundary layer. It is found that the low-frequency components of velocity fluctuations begin to grow up inside the boundary layer before the outer disturbances directly reach the boundary layer. A streaky structure is also observed in the downstream region.
201 The Effect of Disturbances Introduced Outside the Boundary Layer(2)

OHNO Takurou, MIKI Yusuke, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

Fluids engineering conference ...　2007　"201-1"-"201-4"　2007/11/17
Publisher: The Japan Society of Mechanical Engineers
ISSN： 1348-2882

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The effect of external disturbances on the transition of a flat plate boundary layer is studied by introducing external disturbances using a turbulence generator located behind the leading edge of the plate. The results indicate the existence of the process, where low-frequency components of the external disturbances influence the boundary layer, generating low-frequency velocity fluctuations inside the boundary layer, prior to the high-frequency components directly reaching the boundary layer.
1102 High-efficient Mixing in Submillimeter-scale Channels with Simple Shapes(2)

NORO Shuta, KOKUNAI Kenji, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

Fluids engineering conference ...　2007　"1102-1"-"1102-4"　2007/11/17
Publisher: The Japan Society of Mechanical Engineers
ISSN： 1348-2882

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The aim of this study is to find a method to increase the interfacial area of two fluids in order to enhance mixing in a small scale channel. The investigation is carried out by an experiment as well as a numerical simulation. The matching between the results of the two methods is qualitatively good. Placing obstacles inside the cavity is found to be an effective method for mixing enhancement. It is shown that the concentration gradient at the cavity outlet can be used to predict the mixing in the downstream region. It is also shown that the technique used in the millimeter scale channel can be applied to a sub-millimeter scale.
109 Numerical Simulation of an Unsteady Flow Inside Fluidics using a Particle Method

KANEKO Masaki, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2007　(43)　17-18　2007/09/29
Publisher: The Japan Society of Mechanical Engineers
114 Experimental Study of the Effect of Outer Disturbance on the Transition of a Flat-Plate Boundary layer

MIKI Yusuke, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2007　(42)　29-30　2007/03/13
Publisher: The Japan Society of Mechanical Engineers
105 Experimental Study of Stretching and Splitting of Vortex

HORIKAWA Satoshi, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2007　(42)　11-12　2007/03/13
Publisher: The Japan Society of Mechanical Engineers
106 Landing Condition of a Vortex Generated by a Rotating Cylinder

WATANABE Michiharu, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2007　(42)　13-14　2007/03/13
Publisher: The Japan Society of Mechanical Engineers
Numerical Simulation of a Flow inside an Impedance Pump

HAYASHI Hiroki, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2007　347-347　2007
Publisher: 日本流体力学会

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Numerical simulation of a flow inside an impedance pump is carried out by using a SPH method. In this study, the algorithm of the density adjustment is introduced in order to express an imcompressible flow. The transformation of an elastic wall is simulated by using a transformation model described as the superposition of progressive waves and reflected waves traveling on the elastic wall. The flow whose direction changes depending on the vibrating position and the frequency is simulated.
Study on the Interactions between Hierarchical Vortex Motions

KURIHARA Makoto, Abdel KAREEM W., SHIGETA Masaya, FUKUNISHI Yu, IZAWA Seiichiro

2007　77-77　2007
Publisher: 日本流体力学会

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Large-scale vortices are extracted from a steady homogeneous isotropic turbulence using the Fourier lowpass filter. Extracted vortices are replaced with a group of vortex blobs to directly calculate the induced velocities between the vortices. As a result, it is found that a stretching of a vortex is caused by vortices near-by.
Active Feedback Control of Instability Waves with Several Frequency Modes

SANO Tomoya, IZAWA Seiichiro, SHIGETA Masaya, FUKUNISHI Yu

2007　165-165　2007
Publisher: 日本流体力学会

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A feedback control of T-S waves and oblique waves, observed in the initial stage of the transition, is performed using a combination of an array of piezo-ceramic actuators and hotwire sensors both attached on a flat-plate surface. The actuators are operated based on evaluation matrices that use the signals of downstream sensors, and generate counter waves that cancel the oncoming instability waves. The results show that the system could weaken these waves with multiple frequency modes even when the information on the oncoming waves is unavailable.
SPH Simulation of Double-Diffusive Convection Phenomena

SHIGETA Masaya, WATANABE Takahiro, IZAWA Seiichiro, FUKUNISHI Yu

2007　170-170　2007
Publisher: 日本流体力学会

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The SPH (Smoothed Particle Hydrodynamics) method is developed and applied to simulations of double-diffusive convection phenomena such as "salt fingers" and "Christmas tree" where the temperature conduction and the salinity diffusion are simultaneously taking place. It is known that the "salt finger" phenomenon occurs due to the instability at the interface between liquids of two different densities where double diffusion is taking place. The present method successfully simulates this phenomenon when the density field has a gradient. It is also shown that the "Christmas tree" phenomenon can be observed when the original salinity has a staircase-like profile.
309 Mixing Enhancement of Liquids in a Micro-Scale Channel(1)

KOKUNAI Kenji, KANEKO Takashi, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

Fluids engineering conference ...　2006　"309-a"　2006/10/28
Publisher: The Japan Society of Mechanical Engineers
ISSN： 1348-2882
309 Mixing Enhancement of Liquids in a Micro-Scale Channel(2)

KOKUNAI Kenji, KANEKO Takashi, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

Fluids engineering conference ...　2006　"309-1"-"309-4"　2006/10/28
Publisher: The Japan Society of Mechanical Engineers
ISSN： 1348-2882

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The aim of this study is to develop a method to enhance mixing in a small-scale channel by an active control. In the one millimeter-scale study, it is shown that investigating the fractal dimension and the length of interface between the liquids in the upstream region can be a guideline for designing a better mixing channel. The comparison between the results of one millimeter and 500 micron scale experiments is also done.
302 Investigation of a Flow Through a Complicated Shaped Nozzle by a SPH Method

HATAKENAKA Shogo, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2006　(42)　67-68　2006/09/30
Publisher: The Japan Society of Mechanical Engineers
301 Research by Spectral Method Concerning Instability of Flow

UCHIYAMA Takahiro, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2006　(42)　65-66　2006/09/30
Publisher: The Japan Society of Mechanical Engineers
熱プラズマによるナノ粒子合成のモデリング Invited

渡辺隆行, 茂田正哉

混相流　20　(1)　4-9　2006/04
AM06-03-003 Analysis of the characteristics of the multi-scaled vortical structures in a turbulent field

ABDEL KAREEM Waleed, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2006　35-35　2006
Publisher: 日本流体力学会

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An attempt to study the multi-scaled characteristics of vortical structures in a turbulent flow field is carried out. The Fourier decomposition is applied against the velocity field to extract three scales, namely the large, intermediate and fine scale flow fields. A new method to identify the central axes of vortices at each scale is introduced. Results show that the radii of the extracted vortical structures are of the order of several times of the Kolmogorov microscale. It is also shown that the lengths of the vortical structures in the intermediate-scale case scale with the integral length scale.
AM06-12-009 The active control of oblique waves in a transitional boundary layer using the array of piezo actuators

SANO Tomoya, SHIGETA Masaya, IZAWA Seiichiro, FUKUNISHI Yu

2006　150-150　2006
Publisher: 日本流体力学会

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A Feedback control of T-S waves and oblique waves in a transitional flat-plate boundary layer is attempted using an array of piezo ceramic actuators. Operating signals of each actuator are determined based on operating matrix, obtained by measuring the growth of velocity fluctuations from each actuator. It is shown that the system is capable of reducing the amplitude of the velocity fluctuation such as oblique waves of a large inclination angle.
904 Effect of Oxygen Injection on Chemically Non-Equilibrium Argon Induction Plasma Flows

SHIGETA Masaya, ATSUCHI Nobuhiko, WATANABE Takayuki

Fluids engineering conference ...　2005　136-136　2005/10/28
Publisher: The Japan Society of Mechanical Engineers
ISSN： 1348-2882
(13)数値シミュレーションを用いた高機能プラズマ流によるマイクロ・ナノ粒子創製の研究(研究奨励,日本機械学会賞〔2004年度(平成16年度)審査経過報告〕)

茂田正哉

日本機械学會誌　108　(1038)　362-362　2005/05/05
Publisher: 一般社団法人日本機械学会
ISSN： 0021-4728

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Books and Other Publications 1

新溶接アーク現象

産報出版株式会社　2021/06/01

Presentations 193

プラズマ照射条件および非照射条件下で生成したバブルバースト由来飛散粒子へのCuおよびSnの濃化の比較

郡司崇秀, 伊藤剛仁, 寺嶋和夫, 吉川穣, 杉本真, 茂田正哉, 宗岡均

第73回応用物理学会春季学術講演会　2026/03/17
グライディングアーク放電におけるアークプラズマの伸長および繋ぎかえ過程の電磁熱流動場連成シミュレーション

山岸巧実, 紺野涼太郎, 田中駿介, 徂徠帆夏, 吉川穣, 杉本真, 宗岡均, 茂田正哉

日本機械学会東北支部第61期総会・講演会　2026/03/16
真空積層造形における層間接着プロセスの粒子法シミュレーションと分子拡散を指標とした層間接着性の検討

結城皓征, 佐藤匠真, 村上怜史, 富田慎吾, 杉本真, 古免久弥, 宗岡均, 茂田正哉

日本機械学会東北支部第61期総会・講演会　2026/03/16
超臨界二酸化炭素中レーザーアブレーションにより生成される気泡様構造に対する静電場印加の影響

千葉亮公, 杉本真, 茂田正哉, 宗岡均

日本機械学会東北支部第61期総会・講演会　2026/03/16
窒素を含むプラズマが溶銑の脱銅および脱錫に及ぼす影響（2）（バブルバースト飛散粒子中へのCu・Sn濃化に対するプラズマ照射/非照射の影響の評価）

郡司崇秀, 伊藤剛仁, 寺嶋和夫, 吉川穣, 杉本真, 茂田正哉, 宗岡均

日本鉄鋼協会 2026年春季（第191回）講演大会　2026/03/13
Computational Fluid Mechanics for Nanopowder Mass-Production and Arc Quenching Processes with High-Enthalpy-Plasma-Induced Turbulence Invited

Masaya Shigeta

The 14th Asia-Pacific International Symposium on the Basics and Applications of Plasma Technology (APSPT-14)　2025/12/12
The Charm and Difficulty of Computational Plasma Fluid Mechanics Invited

Masaya Shigeta

Taipei Tech & Tohoku University (School of Engineering) 2025 Joint Symposium　2025/11/17
Numerical Simulation of Gas-Liquid Multiphase Evaporation in Porous Media Using Phase-Field Lattice Boltzmann Method

Yoshinari Ishikawa, Joe Yoshikawa, Makoto Sugimoto, Hitoshi Muneoka, Masaya Shigeta

Taipei Tech & Tohoku University (School of Engineering) 2025 Joint Symposium　2025/11/17
Lava Flow Simulation Including Surface Plastic Skin Formation Effect

Shingo Tomita, Takuma Sato, Satoshi Murakami, Joe Yoshikawa, Makoto Sugimoto, Hisaya Komen, Masaya Shigeta

Taipei Tech & Tohoku University (School of Engineering) 2025 Joint Symposium　2025/11/17
SPH Simulation of Plasma-Contacted Liquid Flow Including Short-Lived Reactive Species with Chemical Reactions

Satoshi Murakami, Shingo Tomita, Joe Yoshikawa, Kalyani Barman, Makoto Sugimoto, Shota Sasaki, Hisaya Komen, Hitoshi Muneoka, Toshiro Kaneko, Masaya Shigeta

Twenty-second International Conference on Flow Dynamics (ICFD2025)　2025/11/10
Investigation of the Effects of Surface Plastic Skin on Lava Flow Dynamics Using SPH Simulation

Shingo Tomita, Takuma Sato, Satoshi Murakami, Joe Yoshikawa, Makoto Sugimoto, Hisaya Komen, Masaya Shigeta

Twenty-second International Conference on Flow Dynamics (ICFD2025)　2025/11/10
Development of Phase-Field Lattice Boltzmann Method for Gas-Liquid Multiphase Evaporation Simulation in Porous Media

Yoshinari Ishikawa, Joe Yoshikawa, Makoto Sugimoto, Masaya Shigeta

Twenty-second International Conference on Flow Dynamics (ICFD2025)　2025/11/10
Scattering Behavior of Cu,Sn-Enriched Droplets from Molten Metal Pool under Nitrogen-Containing Arc Plasma

Takahide Gunji, Tsuyohito Ito, Kazuo Terashima, Joe Yoshikawa, Makoto Sugimoto, Masaya Shigeta, Hitoshi Muneoka

Twenty-second International Conference on Flow Dynamics (ICFD2025)　2025/11/10
Elemental Enrichment in Metal Particles Scattered from Molten Iron via Ar-N2 Arc Plasma Irradiation

Takahide Gunji, Tsuyohito Ito, Kazuo Terashima, Joe Yoshikawa, Makoto Sugimoto, Masaya Shigeta, Hitoshi Muneoka

14th Asian-European International Conference on Plasma Surface Engineering (AEPSE2025)　2025/11/03
SPH Simulation of Reactive Flow with Short-Lived Reactive Species from Plasma-Liquid Interface

Satoshi Murakami, Shingo Tomita, Joe Yoshikawa, Kalyani Barman, Makoto Sugimoto, Shota Sasaki, Hisaya Komen, Hitoshi Muneoka, Toshiro Kaneko, Masaya Shigeta

14th Asian-European International Conference on Plasma Surface Engineering (AEPSE2025)　2025/11/03
Mathematical descriptions and algorithms of Collective Nanoparticle Growth in High-Enthalpy Plasma Flows Invited

Masaya Shigeta

The 2nd Global Meet on Nanotechnology and Nanomaterials　2025/10/23
SPH Simulation of Lava Flow with Plastic Surface Skin

Shingo Tomita, Takuma Sato, Satoshi Murakami, Joe Yoshikawa, Makoto Sugimoto, Hisaya Komen, Masaya Shigeta

IX International Conference on Particle-Based Methods (PARTICLES 2025)　2025/10/21
Role of vortex in air entrainment into argon arc plasma: a numerical study toward wire arc additive manufacturing design Invited

Masaya Shigeta, Honatsu Sorai, Joe Yoshikawa, Makoto Sugimoto, Hisaya Komen, Manabu Tanaka

The 7th International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation (Visual-JW), The 5th International Symposium on Design & Engineering by Joint Inverse Innovation for Materials Architecture (DEJI2MA)　2025/10/02
The Difficulty and Charm of Computational Plasma Fluid Mechanics Invited

Masaya Shigeta

9th Asia Pacific Conference on Plasma Physics, AAPPS-DPP2025　2025/09/24
プラズマ接触液相における反応を伴う短寿命活性種の輸送シミュレーション

村上怜史, 富田慎吾, 吉川穣, Barman Kalyani, 杉本真, 佐々木渉太, 古免久弥, 宗岡均, 金子俊郎, 茂田正哉

化学工学会第56回秋季大会　2025/09/17
Chapman-Enskog法を用いた水-空気混合系輸送係数の推算

杉本真, 岸本陽介, 徂徠帆夏, 田中学, 渡辺隆行, 茂田正哉

化学工学会第56回秋季大会　2025/09/17
窒素を含むアークプラズマ照射による溶鉄液滴の飛散と組成変化

郡司崇秀, 伊藤剛仁, 寺嶋和夫, 吉川穣, 杉本真, 茂田正哉, 宗岡均

第86回応用物理学会秋季学術講演会　2025/09/10
フェーズフィールド格子ボルツマン法による静電場中の液柱流破断シミュレーション

杉本真, Barman Kalyani, 佐々木渉太, 金子俊郎, 茂田正哉

第86回応用物理学会秋季学術講演会　2025/09/06
Estimation of transport coefficients for water-air mixtures using the Chapman-Enskog method

Makoto Sugimoto, Yosuke Kishimoto, Honatsu Sorai, Manabu Tanaka, Takayuki Watanabe, Masaya Shigeta

11th International Symposium on Turbulence, Heat and Mass Transfer 2025 (THMT'25)　2025/07/25
Theoretical evaluation of turbulent heat transfer for arc plasma in SF6 flow

Masaya Shigeta, Yuki Inada, Yasunori Tanaka

26th International Symposium on Plasma Chemistry (ISPC26)　2025/06/17
Transport Properties of Water-Air Mixture System

Makoto Sugimoto, Yosuke Kishimoto, Honatsu Sorai, Manabu Tanaka, Takayuki Watanabe, Masaya Shigeta

26th International Symposium on Plasma Chemistry (ISPC26)　2025/06/17
Visualization of Thermal Plasma Jet Induced Turbulence Using Spatial-Frequency-Resolved Schlieren Sensor

Yuito Yamada, Yuki Inada, Makoto Sugimoto, Joe Yoshikawa, Manabu Tanaka, Masaya Shigeta

26th International Symposium on Plasma Chemistry (ISPC26)　2025/06/17
Numerical simulation of lava flow with plastic skin using a particle-based method

Shingo Tomita, Takuma Sato, Satoshi Murakami, Joe Yoshikawa, Makoto Sugimoto, Hisaya Komen, Masaya Shigeta

Japan Geoscience Union Meeting 2025 (JpGU2025)　2025/05/30
空間周波数分解シュリーレン法を用いた高エンタルピープラズマジェット近傍の乱流構造解明に向けた実験的研究

山田唯人, 稲田優貴, 杉本真, 吉川穣, 田中学, 茂田正哉

第25回日本伝熱学会東北支部学生発表会　2025/05/10
熱膨張による密度変化を伴う流体へ適用可能な粒子法の開発

佐藤匠真, 村上怜史, 富田慎吾, 杉本真, 吉川穣, 古免久弥, 茂田正哉

第25回日本伝熱学会東北支部学生発表会　2025/05/10
希土類金属添加電極を用いたCO2アーク溶接の電磁熱流体シミュレーション

紺野涼太郎, 徂徠帆夏, 杉本真, 吉川穣, 茂田正哉

第25回日本伝熱学会東北支部学生発表会　2025/05/10
Recent progress of computational welding processes Invited

2025/03/12
熱膨張による密度変化を伴う流体シミュレーションのための粒子法の開発

佐藤匠真, 村上怜史, 富田慎吾, 吉川穣, 杉本真, 古免久弥, 茂田正哉

日本機械学会第55回東北学生会卒業研究発表講演会　2025/03/07
陰極希土類金属含有がCO2溶接アークプラズマ場を変えるメカニズム解明のための電磁熱流体シミュレーション

紺野涼太郎, 徂徠帆夏, 岸本陽介, 吉川穣, 杉本真, 茂田正哉

日本機械学会第55回東北学生会卒業研究発表講演会　2025/03/07
空間周波数分解シュリーレンセンサを用いた高エンタルピープラズマジェット近傍の乱流構造の解明に向けた実験的研究

山田唯人, 稲田優貴, 杉本真, 吉川穣, 田中学, 茂田正哉

日本機械学会第55回東北学生会卒業研究発表講演会　2025/03/07
The Difficulty and Charm of Computational Plasma Fluid Mechanics Invited

Czech – Japan Thermomechanics Workshop　2025/02/26
プラズマ流体工学の紹介 ―ものをつくる１万度の流れ― Invited

茂田正哉

特別講義（岡山大学学術研究院）　2025/01/27
プラズマ流体工学研究の難しさと面白さ Invited

茂田正哉

特別セミナー（東京理科大学総合大学院ウォーターフロンティア研究センター）　2024/12/26
Time-Dependent Numerical Simulation of Heat and Mass Transports in Water Plasma Jet with Evaluation of Transport Coefficients of Water-Air Mixture System

Yosuke Kishimoto, Joe Yoshikawa, Makoto Sugimoto, Manabu Tanaka, Takayuki Watanabe, Masaya Shigeta

21st International Conference on Fluid Dynamics (ICFD2024)　2024/11/18
Numerical Simulation of Electrically Conductive Gas-Liquid Two-Phase Flow Using Phase-Field Lattice Boltzmann Method

Makoto Sugimoto, Masaya Shigeta

21st International Conference on Fluid Dynamics (ICFD2024)　2024/11/18
Numerical Analysis of Fe-Sm Alloy Nanopowder Growth in Thermal Plasma Tail Using Binary Aerosol Model

Shunsuke Tsurumi, Joe Yoshikawa, Makoto Sugimoto, Jian Wang, Yusuke Hirayama, Masaya Shigeta

21st International Conference on Fluid Dynamics (ICFD2024)　2024/11/18
SPH Simulation of Toe-like and Levee-like Structure Formation of Lava Flow

Shingo Tomita, Joe Yoshikawa, Makoto Sugimoto, Hisaya Komen, Masaya Shigeta

21st International Conference on Fluid Dynamics (ICFD2024)　2024/11/18
熱膨張による密度低下に応じた流れの加速現象の粒子法シミュレーション

佐藤匠真, 富田慎吾, 村上怜史, 古免久弥, 杉本真, 茂田正哉

スマートプロセス学会 2024年度学術講演会　2024/11/15
Introduction of Computational Plasma Fluid Mechanics Invited

Masaya Shigeta

2024 C-MAST (Center for Mechanical and Aerospace Science and Technology) SEMINARS　2024/10/24
フェーズフィールド格子ボルツマン法による気液混相電磁流体シミュレーション

杉本真, 茂田正哉

第37回計算力学講演会　2024/10/18
プラズマ流体数値予測の進展 Invited

茂田正哉

2024 プラズマ材料工学研究会　2024/10/19
Computational Study of Turbulence Generation Around Arc Plasma Sustained in a Converging-Diverging Cylinder

Masaya Shigeta, Yuki Inada, Yasunori Tanaka

77th Annual Gaseous Electronics Conference (GEC 2024)　2024/10/02
高精度輸送係数を組み込んだ水プラズマ－空気混合系の熱物質対流輸送シミュレーション

岸本陽介, 吉川穣, 杉本真, 田中学, 渡辺隆行, 茂田正哉

日本流体力学会年会2024　2024/09/26
固体柱に衝突する液膜の破砕後の液滴生成プロセスの基礎的研究

石川芳成, 織田康嵩, 吉川穣, 杉本真, 茂田正哉

日本流体力学会年会2024　2024/09/27
数値シミュレーションによる収縮拡大ノズル内SF6系流れ場のアークプラズマ誘発対流熱輸送の研究

茂田正哉, 稲田優貴, 田中康規

日本流体力学会年会2024　2024/09/26
電磁熱流体モデルによるアルゴンアークプラズマへの空気対流輸送過程の数値シミュレーション

徂徠帆夏, 岸本陽介, 吉川穣, 杉本真, 古免久弥, 田中学, 茂田正哉

日本流体力学会年会2024　2024/09/26
パルスティグ溶接における長い突出し陰極表面での渦生成メカニズムとシールド域への酸素混入に及ぼすその役割

茂田正哉, 徂徠帆夏, 岸本陽介, 吉川穣, 杉本真, 古免久弥, 田中学

第266回溶接法研究委員会　2024/08/07
Vortex generated on cathode surface and its role for air entrainment into argon arc plasma in a pulsed TIG welding with long cathode extension

Masaya Shigeta, Honatsu Sorai, Yosuke Kishimoto, Joe Yoshikawa, Makoto Sugimoto, Hisaya Komen, Manabu Tanaka

77th IIW Annual Assembly and International Conference on Welding and Joining　2024/07/10
Numerical investigation of electrode splashing phenomena during TIG welding using phase-field lattice Boltzmann method,

Makoto Sugimoto, Masaya Shigeta

77th IIW Annual Assembly and International Conference on Welding and Joining　2024/07/10
Fluctuation Analysis of Multiphase AC Arc for Large Area Processing by Planar Thermal Plasma Jet

Y. Sogo, R. Takenaka, M. Tanaka, T .Watanabe, M. Shigeta

2024 IEEE International Conference on Plasma Science (ICOPS)　2024/06/16
AXIAL MAGNETIC CONTROL ON TURBULENT VORTICES AND NANOPOWDER CLOUD IN A THERMAL PLASMA JET SYSTEM

Masaya Shigeta

9th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS2024)　2024/06/08
アルゴンアークプラズマへの外気混入プロセスの非定常電磁熱流体シミュレーション

徂徠帆夏, 岸本陽介, 吉川穣, 杉本真, 古免久弥, 茂田正哉

日本伝熱学会東北支部第63期春季講演会第24回日本伝熱学会東北支部学生発表会　2024/05/11
フェーズフィールド格子ボルツマン法を用いた固体円柱に衝突する液膜の破砕シミュレーション

石川芳成, 吉川穣, 杉本真, 茂田正哉

日本伝熱学会東北支部第63期春季講演会第24回日本伝熱学会東北支部学生発表会　2024/05/11
固液相変化および液相間密度差を有する二成分混相熱流体の粒子法シミュレーション

村上怜史, 富田慎吾, 吉川穣, 杉本真, 茂田正哉

日本伝熱学会東北支部第63期春季講演会第24回日本伝熱学会東北支部学生発表会　2024/05/11
数値解析的研究を拓く：合金ナノ粒子雲のエアロゾル的集団生長を表現する数理モデルと計算アルゴリズム Invited

茂田正哉

第71回応用物理学会春季学術講演会，シンポジウム「T13 プラズマが拓くナノ粒子・量子ドットの新展開」　2024/03/23
人為的に破断された液膜下流で生成される液滴の直径と液膜厚さの計測

吉川穣, 織田康嵩, 富田慎吾, 鶴見俊介, 岸本陽介, 杉本真, 茂田正哉

日本機械学会東北支部第59期総会・講演会　2024/03/15
二相系格子ボルツマン法を用いた固体柱衝突時の液膜破砕現象の数値シミュレーション

石川芳成, 吉川穣, 杉本真, 茂田正哉

日本機械学会東北支部第54回学生員卒業研究発表講演会　2024/03/14
非定常性を有するArアークプラズマへの空気混入過程の電磁熱流体シミュレーション

徂徠帆夏, 岸本陽介, 吉川穣, 杉本真, 茂田正哉

日本機械学会東北支部第54回学生員卒業研究発表講演会　2024/03/14
固液相変化および液相間密度差を有する二成分混相熱流体シミュレーションのための粒子法の開発

村上怜史, 富田慎吾, 吉川穣, 杉本真, 茂田正哉

日本機械学会東北支部第54回学生員卒業研究発表講演会　2024/03/14
格子ボルツマン法による導電性気液混相流の数値シミュレーション

杉本真, 茂田正哉

第37回数値流体力学シンポジウム　2023/12/16
アルゴン熱プラズマジェット誘発乱流場におけるシリコンナノ粒子雲分布に及ぼす軸方向磁場の効果

茂田正哉

第37回数値流体力学シンポジウム　2023/12/17
プラズマ熱物性データを組み込んだ高温材料プロセスの数理モデリングとシミュレーション Invited

茂田正哉

日本熱物性学会セミナーシリーズ第5回「高温での材料プロセスのシミュレーションと熱物性」　2023/12/15
数値シミュレーションによる収縮拡大ノズル内アークプラズマ誘発乱流熱輸送の研究

茂田正哉

第39回九州･山口プラズマ研究会　2023/11/03
熱プラズマ：シミュレーション予測 Invited

茂田正哉

2023 プラズマ材料工学研究会/NEXTA フォーラム『熱プラズマスプレー技術の進展とカーボンニュートラルに向けた展開』　2023/10/23
流体力学の基礎 Invited

茂田正哉

計算力学技術者2級（熱流体力学分野の解析技術者）認定試験対策講習会(休日コース)　2023/10/21
Three-Dimensional SPH Simulation for Lava Flow Phenomena

S. Tomita, J. Yoshikawa, M. Sugimoto, H. Komen, M. Shigeta

The 8th International Conference on Particle-Based Methods (PARTICLES 2023)　2023/10/11
Three-dimensional numerical simulation of slag formation and transfer processes in metal active gas welding using incompressible smoothed particle hydrodynamics method

H. Komen, T. Fukazawa, M. Shigeta, M. Tanaka, T. Yamada, N. Saito, M. Fukahori

The 8th International Conference on Particle-Based Methods (PARTICLES 2023)　2023/10/09
COMPUTATIONAL INVESTIGATION OF TURBULENCE GENERATION BY SF6 ARC PLASMA IN A MODEL CIRCUIT BREAKER

MASAYA SHIGETA, YASUNORI TANAKA, YUKI INADA

The 23rd International Conference on Gas Discharges and their Applications (GD 2023)　2023/09/15
TIME-DEPENDENT AND THREE-DIMENSIONAL NUMERICAL SIMULATION OF CARBON-DIOXIDE GAS-BLASTED ARCS IN A NOZZLE

TAKAYASU FUJINO, KENTA INO, YASUNORI TANAKA, YUKI INADA, MASAYA SHIGETA, AKIKO KUMADA

The 23rd International Conference on Gas Discharges and their Applications (GD 2023)　2023/09/12
HIGH-SPEED SEQUENTIAL VISUALIZATION OF ARC-INDUCED TURBULENT-LIKE FLOW UNDER AIR- OR SF6-BLASTED STEADY STATE ARCS

YUKI INADA, YUKI INADA, RYO KIKUCHI, AKIKO KUMADA, KUNIHIKO HIDAKA, FUMITOSHI DEMURA, YUKI DEMURA, YUSUKE NAKANO, YASUNORI TANAKA, MASAYA SHIGETA

The 23rd International Conference on Gas Discharges and their Applications (GD 2023)　2023/09/15
Numerical Study of Axial Magnetic Effects on Silicon Nanopowder Cloud Around an Argon Thermal-Plasma-Jet-Induced Turbulent Flow Field

Masaya Shigeta

ASME-JSME-KSME Fluids Engineering Division (AJKFED2023)　2023/07/13
Lattice Boltzmann Simulation of Liquid Infiltration into Microscale Porous Structure

Makoto Sugimoto, Masayoshi Mizutani, Naoki Takano, Masaya Shigeta

ASME-JSME-KSME Fluids Engineering Division (AJKFED2023)　2023/07/12
Capture of compositional distribution for binary alloy during induction thermal plasma process

Y. Hirayama, M. Shigeta, K. Takagi, K. Ozaki

The 25th International Symposium on Plasma Chemistry (ISPC25)　2023/05/23
Numerical Study of Collective Formation Process of Fe-Al Alloy Nanoparticles in Thermal Plasma Tail Using Two-Component Co-condensation Model

S. Tsurumi, M. Sugimoto, M. Shigeta, J. Wang, Y. Hirayama

The 25th International Symposium on Plasma Chemistry (ISPC25)　2023/05/23
Characteristics of Planar Thermal Plasma Jet by Diode-rectified AC Arc

R. Takenaka, Y. Sogo, M. Tanaka, T. Watanabe, M. Shigeta, T. Matsuura

2023/05/23
Fluctuation Analysis of Diode-rectified AC Arc by High-speed Visualization

Y. Sogo, R. Takenaka, M. Tanaka, T. Watanabe, M. Shigeta, T. Matsuura

The 25th International Symposium on Plasma Chemistry (ISPC25)　2023/05/23
Time-Dependent Numerical Simulation of Heat and Mass Transports in Water Plasma Jet with Air Entrainment

Y. Kishimoto, M. Sugimoto, M. Shigeta, M. Tanaka, T. Watanabe

The 25th International Symposium on Plasma Chemistry (ISPC25)　2023/05/22
Rare-earth Sm-Co nanopowder prepared by low oxygen-induction thermal plasma process

K. Park, Y. Hirayama, M. Shigeta, Z. Liu, M. Kobashi, K. Takagi

2023/05/25
Two-Dimensional Axisymmetric Simulation of Arc-Plasma-Induced Turbulence of SF6 and Air Flows in a Converging-Diverging Cylinder

M. Shigeta, Y. Inada, Y. Tanaka

The 25th International Symposium on Plasma Chemistry (ISPC25)　2023/05/22
Experimental investigation of droplet ejection phenomena in AC gas tungsten arc welding

H. Komen, K. Iida, M. Shigeta, M. Tanaka

The 25th International Symposium on Plasma Chemistry (ISPC25)　2023/05/22
SF6系アークプラズマの乱流誘発メカニズム解明に向けた数値シミュレーション Invited

茂田正哉

応用物理学会プラズマエレクトロニクス分科会第40回新領域研究会　2023/03/27
空気巻込みを伴う水プラズマジェットの非定常数値シミュレーション

岸本陽介, 杉本真, 茂田正哉

日本機械学会東北支部第53回学生員卒業研究発表講演会　2023/03/07
高周波誘導熱プラズマ下流域における合金ナノ粒子群の集団形成過程の数値解析的研究

鶴見俊介, 杉本真, 茂田正哉

日本機械学会東北支部第53回学生員卒業研究発表講演会　2023/03/07
粒子法を用いた溶岩流現象の数値シミュレーション

富田慎吾, 杉本真, 茂田正哉

日本機械学会東北支部第53回学生員卒業研究発表講演会　2023/03/07
熱プラズマを利用したナノ粒子創製プロセスの諸現象のモデル化と数値計算 Invited

茂田正哉

産業技術総合研究所中部センター MagMet Seminar　2022/12/05
高周波誘導熱プラズマ流内における金属粉末粒子の輸送及び相変化過程の数値シミュレーション

織田康嵩, 杉本真, 茂田正哉

（一社）スマートプロセス学会 2022年度学術講演会　2022/11/15
水プラズマジェットの外気巻込み過程の数値シミュレーション

岸本陽介, 杉本真, 茂田正哉

（一社）スマートプロセス学会 2022年度学術講演会　2022/11/15
相変化を伴う溶融金属の斜面流下現象の三次元粒子法シミュレーション

富田慎吾, 杉本真, 茂田正哉

（一社）スマートプロセス学会 2022年度学術講演会　2022/11/15
熱プラズマ下流域における二元系合金ナノ粒子生成プロセスの数値解析的研究

鶴見俊介, 杉本真, 茂田正哉

（一社）スマートプロセス学会 2022年度学術講演会　2022/11/15
SPH法を用いたマグ溶接中のスラグ形成・輸送過程の3次元数値シミュレーション

深澤孝公, 古免久弥, 茂田正哉, 田中学, 山田哲生, 斉藤直子, 深堀貢

（一社）スマートプロセス学会 2022年度学術講演会　2022/11/15
交流ティグ溶接におけるタングステン電極の液滴飛散機構に関する一考察

飯田健太, 古免久弥, 茂田正哉, 田中学

（一社）スマートプロセス学会 2022年度学術講演会　2022/11/15
高温金属溶接シミュレーションへの粒子法の適用 Invited

茂田正哉

Prometech Simulation Conference 2022　2022/11/08
数値プラズマ流体工学の事例紹介 ― 熱プラズマ誘発乱流が支配するナノ粒子生成およびアーク消弧プロセス ― Invited

茂田正哉

第38回九州･山口プラズマ研究会　2022/11/06
Computational Studies of Thermal-Plasma-Induced Turbulence on Nanopowder Generation and Sustained Arc Discharge Invited

Masaya Shigeta

The 75th Annual Gaseous Electronics Conference & The 11th International Conference on Reactive Plasmas (GEC 2022/ICRP-11)　2022/10/04
Arc Temperature Fluctuation near Electrode of Diode-Rectified Multiphase AC Arc

Manabu Tanaka, Junjie Chang, Yuki Takemoto, Takayuki Watanabe, Tsugio Matsuura, Tsuguo Ueda, Hideki Touzaki, Juan Pablo Trelles, Masaya Shigeta

The 75th Annual Gaseous Electronics Conference & The 11th International Conference on Reactive Plasmas (GEC 2022/ICRP-11)　2022/10/04
athematical Modelling and Simulations of Thermal Plasma - Nanopowder Fabrication Processe Invited

M. Shigeta

National Conference on Recent Developments and Evolving Trends in Plasma Science and Technology & Pre-conference Workshop on Modelling and Simulation of Industrial Plasmas　2022/09/23
粒子法シミュレーションを用いたマグ溶接中のスラグ形成・輸送過程の調査

深澤孝公, 古免久弥, 茂田正哉, 田中学, 山田哲生, 斉藤直子, 深堀貢

溶接学会 2022年度秋季全国大会　2022/09/08
交流ティグ溶接における電極飛散を支配する因子の特定

飯田健太, 古免久弥, 茂田正哉, 田中学

溶接学会 2022年度秋季全国大会　2022/09/08
溶融金属対流現象を考慮した軟鋼／アルミニウム合金異材抵抗スポット溶接中のナゲット形成過程の3次元粒子法シミュレーション

古免久弥, 築地慎之輔, 立花瑞樹, 永瀬裕也, 伊與田宗慶, 城鮎美, 佐野智一, 菖蒲敬久, 田中学, 茂田正哉

溶接学会 2022年度秋季全国大会　2022/09/08
Experimental investigation of dominant factors for droplet ejection from tungsten electrode during AC TIG welding

K. IIDA, H. KOMEN, M. SHIGETA, M. TANAKA

The 5th International Union of Materials Research Societies - International Conference of Young Researchers on Advanced Materials (IUMRS – ICYRAM 2022)　2022/08/04
Development of Thermal Lattice Boltzmann Method in Transforming Liquid

M. Sugimoto, K. Toyama, T. Miyazaki, M. Kaneda, K. Suga, M. Shigeta

The 5th International Union of Materials Research Societies - International Conference of Young Researchers on Advanced Materials (IUMRS – ICYRAM 2022)　2022/08/04
Computational Studies on Nanopowder Formation and Turbulence Generation in Thermal Plasma Applications Invited

M. Shigeta

The 5th International Union of Materials Research Societies - International Conference of Young Researchers on Advanced Materials (IUMRS – ICYRAM 2022)　2022/08/04
Numerical investigation of influencing factors of slag transportation process during metal active gas welding using incompressible smoothed particle hydrodynamics method

Takamasa Fukazawa, Hisaya Komen, Masaya Shigeta, Manabu Tanaka, Mitsugi Fukahori, Naoko Saito, Tetsuo Yamada

IIW 2022 International Conference on Welding and Joining　2022/07/18
Experimental study of dominant factors for droplet ejection from tungsten electrode during AC TIG welding

Kenta Iida, Hisaya Komen, Masaya Shigeta, Manabu Tanaka

IIW 2022 International Conference on Welding and Joining　2022/07/18
プラズマジェットの変動現象 Invited

茂田正哉

日本学術振興会第153委員会藤沢研究会　2022/07/08
Experimental Study of Dominant Factors for Droplet Ejection from Electrode During AC TIG Welding

Kenta Iida, Masaya Shigeta, Hisaya Komen, Manabu Tanaka

2022 MRS Spring Meeting & Exhibit　2022/05/25
Numerical Investigation of Influencing Factors of Slag Transportation Process During Metal Active Gas Welding Using Particle Method

Takamasa Fukazawa, Hisaya Komen, Masaya Shigeta, Manabu Tanaka, Mitsugi Fukahori, Naoko Saito, Tetsuo Yamada

2022 MRS Spring Meeting & Exhibit　2022/05/25
数学的記述と計算アルゴリズム構築に根差した熱プラズマ流－材料創製プロセスの研究 Invited

茂田正哉

日本伝熱学会東北支部春季講演会　2022/05/07
熱プラズマ誘発乱流が関係するナノ粒子生成およびアーク消弧プロセスの数値解析的研究 Invited

茂田正哉

(独)日本学術振興会第153委員会第155回研究会　2022/04/28
Computational Plasma Fluid Mechanics –– Studies on Nanopowder Fabrication and Plasma-Induced Turbulence –– Invited

Masaya Shigeta

The 22th Gaseous Electronics Meeting (GEM 2022)　2022/02/14
モデル遮断器における空気およびSF6アークプラズマの乱流的ダイナミクスの数値実験

茂田正哉, 田中康規, 稲田優貴, 平野雄一, 前出裕亮, 出村文俊, 甲斐広将, 藤野貴康, 猪野健太, 熊田亜紀子

第39回プラズマプロセシング研究会(SPP-39)/第34回プラズマ材料科学シンポジウム(SPSM34)　2022/01/26
Mathematical Descriptions and Numerical Analyses of Thermal Plasma - Nanopowder Production Processes Invited

Masaya Shigeta

Faculty of Science, Suez University Symposium in "Higher Performance Computing for Mathematics and Applications"　2021/12/20
Mathematical Descriptions and Numerical Predictions of Thermal Plasma - Nanopowder Production Systems Invited

Masaya Shigeta

The 12th Asia-Pacific International Symposium on the Basics and Applications of Plasma Technology (APSPT-12)　2021/12/09
非対称性を考慮したAbel逆変換法による傾斜ティグアークプラズマの分光計測

山下悠登, 茂田正哉, 古免久弥, 田中学

スマートプロセス学会2021年度学術講演会　2021/11/15
軟鋼／アルミニウム合金異材抵抗スポット溶接中のナゲット形成過程におけるマランゴニ効果を考慮した対流現象の3次元粒子法シミュレーション

築地慎乃輔, 立花瑞樹, 永瀬裕也, 伊與田宗慶, 城鮎美, 佐野智一, 菖蒲敬久, 古免久弥, 田中学, 茂田正哉

スマートプロセス学会2021年度学術講演会　2021/11/15
粒子法を用いたマグ溶接時のスラグ輸送過程の支配的因子の調査

深澤孝公, 古免久弥, 茂田正哉, 田中学

スマートプロセス学会2021年度学術講演会　2021/11/15
交流ティグ溶接における電極の飛散メカニズムに関する実験的考察

飯田健太, 茂田正哉, 古免久弥, 田中学

スマートプロセス学会2021年度学術講演会　2021/11/15
CO2ガス吹き付けアークの減衰挙動に関する数値解析

藤野貴康, 猪野健太, 茂田正哉, 田中康則, 稲田優貴, 熊田亜紀子

日本機械学会第99期流体工学部門講演会　2021/11/08
Numerical Simulation of Unsteady Behavior of Arc Plasma Flow in a Cylindrical Nozzle

K. Ino, T. Fujino, Y. Tanaka, M. Shigeta, Y. Inada, A. Kumada

18th International Conference on Fluid Dynamics　2021/10/27
High-Speed Visualization of Temperature Fluctuation of Diode-Rectified Multiphase Ac Arc near the Electrodes

Chang Junjie, Takemoto Yuki, Suenaga Takuya, Tamae Aika, Tanaka Manabu, Watanabe Takayuki, Matsuura Tsugio, Ueda Tsuguo, Tozaki Hideki, Trelles Juan-Pablo, Shigeta Masaya

74th Annual Gaseous Electronics Conference (GEC2021), American Physical Society　2021/10/05
Fluctuation Phenomena in Planar Thermal Plasma Jet by Diode-Rectified AC Arc Discharge

Manabu Tanaka, Takafumi Okuma, Takayuki Watanabe, Tsugio Matsuura, Juan Pablo Trelles, Masaya Shigeta

4th Annual Gaseous Electronics Conference (GEC2021), American Physical Society　2021/10/05
Planar thermal plasma jet in diode-rectified AC arc system under atmospheric pressure Invited

Manabu Tanaka, Takuya Suenaga, Aika Tamae, Takafumi Okuma, Takayuki Watanabe, Tsugio Matsuura, Juan Pablo Trelles, Masaya Shigeta

5th Asia Pacific Conference on Plasma Physics, AAPPS-DPP2021 as on-line Conference　2021/09/30
Modelling and Simulation of Turbulent Thermal Plasma Flows for Nanoparticle Mass Fabrication Invited

Masaya Shigeta

5th Asia Pacific Conference on Plasma Physics, AAPPS-DPP2021 as on-line Conference　2021/09/29
粒子法シミュレーションを用いたマグ溶接時のスラグ輸送過程の支配的因子の調査

深澤孝公, 古免久弥, 茂田正哉, 田中学

（一社）溶接学会 2021年度秋季全国大会　2021/09/21
非対称アーベル逆変換法を用いた傾斜ティグアークプラズマの分光計測

山下悠登, 茂田正哉, 古免久弥, 田中学

（一社）溶接学会 2021年度秋季全国大会　2021/09/21
交流ティグ溶接における電極の飛散メカニズムの検討

飯田健太, 茂田正哉, 古免久弥, 田中学

（一社）溶接学会 2021年度秋季全国大会　2021/09/21
軟鋼／アルミニウム合金異材抵抗スポット溶接中のナゲット形成過程におけるマランゴニ効果を考慮した対流現象の3次元粒子法シミュレーション

築地慎乃輔, 立花瑞樹, 永瀬裕也, 伊與田宗慶, 城鮎美, 佐野智一, 菖蒲敬久, 田中学, 茂田正哉

（一社）溶接学会 2021年度秋季全国大会　2021/09/21
熱プラズマ流を利用した材料プロセッシングの数値解析的研究 Invited

茂田正哉

化学工学会第52回秋季大会, SY-56 [熱工学部会シンポジウム], (2021年9月22日), オンライン, LB108.　2021/09/22
ダイオード整流型交流アークを用いたプレーナー熱プラズマジェットの変動現象の可視化

田中学, 大熊崇文, 渡辺隆行, 松浦次雄, Juan-Pablo Trelles, 茂田正哉

第82回応用物理学会秋季学術講演会　2021/09/10
軟鋼／アルミニウム合金異材抵抗スポット溶接におけるナゲット形成過程の３次元粒子法シミュレーションおよび金属間化合物の厚さ推定

築地慎乃輔, 茂田正哉, 田中学

（一社）日本鉄鋼協会第182回秋季講演大会　2021/09/02
傾斜ティグアークプラズマの分光計測への非対称 Abel 逆変換処理の適用

山下悠登, 茂田正哉, 古免久弥, 田中学

（一社）日本鉄鋼協会第182回秋季講演大会　2021/09/02
プラズマ流体工学への道－流れを知り、渦を知る。そして、ものをつくる１万度の世界へ－

茂田正哉

東北大学【オープン講義】　2021/07/27
Arc welding from a viewpoint of electromagnetic thermofluid mechanics Invited

Masaya Shigeta

Japan Welding Society, Tohoku Branch, The 33rd Welding/Joining Meeting　2021/07/16
熱プラズマ流体・材料プロセス研究を主軸として歩み得てきたもの Invited

茂田正哉

2021年第68回応用物理学会春季学術講演会, プラズマエレクトロニクス分科会30周年記念特別セッション　2021/03
高エンタルピープラズマ流による材料プロセッシングの数値解析的研究 Invited

茂田正哉

第37回プラズマ・核融合学会, シンポジウム7「大気圧近傍におけるプラズマ生成とその応用」　2020/12
Modelling and Simulation of Turbulent Thermal Plasma Flows for Nanopowder Mass Production Invited

Masaya Shigeta

7th Plasma Science & Entrepreneurship workshop　2020/11
溶接プロセスシミュレーションの手法・適用例・活用法 Invited

茂田正哉

溶接学会 2020年度秋季全国大会ワークショップ　2020/09
大阪大学接合科学研究所が魅せる溶接可視化の最前線！～ハイスピード撮影と数値シミュレーションによる溶接可視化のハイブリッド解説～ Invited

茂田正哉

株式会社フォトロン Webセミナー　2020/08
溶接ヒュームの集団形成過程のシミュレーション

茂田正哉, 田中学

大阪大学接合科学研究所東京セミナー「計算科学が拓く溶接研究の新展開」　2019/11
アーク溶接を観て診る Invited

茂田正哉, 田中学

高速度イメージングとフォトニクスに関する総合シンポジウム2019　2019/11
To simulate turbulent thermal plasma flows for nanopowder fabrication Invited

Masaya Shigeta

24th International Symposium on Plasma Chemistry (ISPC24)　2019/06
To see thermofluid dynamics in arc welding processes Invited

Masaya Shigeta, Manabu Tanaka

11th International Symposium on Advanced Plasma Science and Its Applications for Nitrides and Nanomaterials / 12th International Conference on Plasma-Nano Technology & Science (ISPlasma2019 / IC-PLANTS2019)　2019/03
航空機製造を支えるプラズマの科学 Invited

茂田正哉

航空機フォーラム　2019/01
アーク溶接シミュレーションへの粒子法の適用 Invited

茂田正哉

Prometec Simulation Conference 2018 joint with GPU Computing Workshop for Advanced Manufacturing　2018/12
Modelling and simulation of growth-transport processes of fume nanoparticles in TIG welding Invited

Masaya Shigeta, Manabu Tanaka

The Symposium of Thailand Welding and Inspection Technology 2018　2018/11
Numerical Simulation of Gas Tungsten Arcs including Cathode Electrode Phenomena Invited

M. Tanaka, M. Shigeta, T. Takida, S. Nakabayashi

4th International Conference on Welding and Failure Analysis of Engineering Materials (WAFA 2018)　2018/11
Understanding of Arcs through Visualizations of Phenomena for Smart Welding Technology Invited

M. Tanaka, M. Shigeta, K. Tanaka

Symposium of Thailand Welding and Inspection Technology (TWIT2018)　2018/11
Modelling and Simulation of Nanoparticles’ Growth and Transport during Arc Welding Invited

Masaya Shigeta

HORIZON 2020, NanoDome User-Conference and project closure meeting　2018/09
非圧縮SPH法と離散要素法を用いたサブマージアーク溶接現象の数値解析

古免久弥, 茂田正哉, 田中学, 阿部洋平, 藤本貴大, 中谷光良

第243回溶接法研究委員会　2018/08
Modelling for Thermal Plasma Flow Dynamics Invited

Masaya Shigeta

19th International Congress on Plasama Physics (ICPP2018)　2018/06
狭窄ノズルを用いたティグ溶接における酸素混入量の実験計測 Invited

三木聡史, 小西恭平, 茂田正哉, 田中学, 村田彰久, 村田唯介

平成29年度溶接技術講演会・見学会　2018/01
Numerical Simulation of TIG arcs including Tungsten Electrode Phenomena Invited

M. Tanaka, K. Konishi, M. Shigeta, T. Takida, S. Nakabayashi, A.Tsuji

Conference of International Welding and Inspection Technology (IWIT2017)　2017/11
熱プラズマを用いたナノ粒子創製プロセスの諸現象のモデル化と数値計算 Invited

茂田正哉

2017年度核融合科学研究所共同研究会平成29年度第1回「境界プラズマ挙動の理解と異分野間融合による新展開」研究会　2017/08
Simulation of ambient gas entrainment into a thermal plasma flow Invited

Masaya SHIGETA, Manabu TANAKA

70th IIW Annual Assembly and International Conference　2017/06
熱プラズマ流動シミュレーションの最前線 Invited

茂田正哉

日本学術振興会第153委員会第131回研究会『産業応用に役立つプラズマ計算科学～ニーズと挑戦～』　2017/06
Modelling for simultaneous growth and transport of nanoparticles around a thermal plasma flow Invited

Masaya Shigeta

Energy Materials Nanotechnology (EMN) Meeting on Nanoparticles 2017　2017/05
熱プラズマを利用したナノ粒子創製プロセスの諸現象のモデル化と数値計算 Invited

茂田正哉

日本物理学会第72回年次大会領域2シンポジウム『高熱流プラズマ・熱プラズマの物理と工学応用への展開』　2017/03
Modeling and Simulation of Nanopowder Growth Processes around Thermal Plasma Flows Invited

M. Shigeta

Symposium Gas-phase Synthesis of Functional Nanomaterials: Fundamental Understanding, Modeling and Simulation, Scale-up　2017/03
画像分光法によるガスメタルアーク溶接における動的プラズマ挙動の観察 Invited

茂田正哉, 中西省太, 田中学

溶接学会平成28年度秋季全国大会論文賞受賞記念講演　2016/09
熱プラズマを利用したナノ粒子創製プロセスにおける諸現象のモデリング Invited

茂田正哉

第23回応用物理学会プラズマエレクトロニクス分科会プラズマ新領域研究会・電気学会プラズマ研究会共催『高エンタルピープラズマの数値シミュレーション』　2016/08
Modelling for fluid-dynamic transport of nanopowder growing around a thermal plasma jet Invited

M. Shigeta

The 14th High-Tech Plasma Processes Conference (HTPP 14)　2016/07
アーク溶接等の熱プラズマプロセスに内在する流動現象のシミュレーション Invited

茂田正哉

国際連携溶接計算科学研究拠点主催第9回講演会『溶接計算科学の実用展開と今後の展望』　2016/03
Computational study on collective growth of silicide nanoparticles under a thermal plasma condition Invited

M. Shigeta, T. Watanabe

The Second International Symposium on Nanoparticles/Nanomaterials and Applications (ISN2A 2016)　2016/01
Modelling of collective formation of nanoparticles transported with a thermal plasma jet Invited

Masaya Shigeta

Frontier of Nano-Materials Based on Advanced Plasma Technologies (International Symposium) at 25th Annual Meeting of MRS-Japan 2015　2015/12
Modelling for turbulent transport of nanoparticles growing around a thermal plasma jet Invited

Masaya Shigeta

68th Annual Gaseous Electronics Conference (GEC-68) held jointly with 9th Annual International Conference on Reactive Plasma (ICRP-9) & 33rd Symposium on Plasma Processing (SPP-33)　2015/10
溶接アークをはじめとした熱プラズマの可視化による動的挙動観察 Invited

茂田正哉, 田中学

第21回応用物理学会プラズマエレクトロニクス分科会プラズマ新領域研究会　2015/10
熱プラズマ流を利用したナノ粒子量産プロセスにおける諸現象のモデル化と数値シミュレーション Invited

茂田正哉

第134回NEC C&CシステムSP研究会　2015/09
熱プラズマ流を用いたナノ粒子創製プロセスのモデリング Invited

茂田正哉

第6回エネルギー理工学研究所国際シンポジウム　2015/08
熱プラズマシミュレーションの最前線 Invited

茂田正哉

溶接学会関西支部平成27年度役員総会　2015/05
熱プラズマシミュレーションの最前線

茂田正哉, 田中学

溶接学会平成27年度春季全国大会フォーラム　2015/04
新世代溶接技術の開発に向けて－現象の可視化によって進化するアーク溶接技術－ Invited

茂田正哉, 田中学

日本非破壊検査協会九州支部第4回技術サロン　2015/02
高速ガス流制御によるスマートアーク溶接技術の開発 Invited

田中学, 茂田正哉, 小西恭平, 村田彰久, 村田唯介

平成26年度溶接技術講演会・見学会　2015/01
熱プラズマ流を利用したナノ粉末量産プロセスにおける諸現象のモデリング Invited

茂田正哉

日本機械学会関西支部第15回秋季技術交流フォーラム　2014/11
溶融池・熱プラズマの流動ダイナミクスおよびナノ粒子の集団形成過程のモデリング Invited

茂田正哉

第81回溶接研究会溶接学会東海支部・日本溶射学会中部支部共催「溶接・溶射シミュレーション研究の最前線」　2014/10
Visualization of arcs by time-dependent monochromatic images in MIG/MAG welding Invited

M. Tanaka, M. Shigeta

The 4th East-Asia Symposium on Technology of Welding & Joining (EAST-WJ 2014)　2014/10
アーク溶接における溶融池流動の粒子法シミュレーション Invited

茂田正哉

第19回応用物理学会プラズマエレクトロニクス分科会プラズマ新領域研究会・電気学会プラズマ研究会共催「重相構造プラズマの基礎と応用技術の展開」　2014/09
Towards Smart Arc Welding Technology for a New Era Manufacturing Invited

M. Tanaka, M. Shigeta, K. Konishi

The 1st Workshop on Welding and Joining 2014 (WWJ2014)　2014/08
Weld Pool Simulation in TIG Welding by a Particle Method Invited

M. Shigeta, M. Tanaka, M. Ito, S. Izawa, Y. Fukunishi

JWRI-KMUTT Workshop　2014/06
Towards a smart arc welding technology for a new era manufacturing in Japan Invited

M. Tanaka, M. Shigeta, K. Konishi, A. Murata, T. Murata

JWRI-KMUTT Workshop　2014/06
Flow Simulation of a Weld Pool in TIG welding by SPH method Invited

M. Shigeta, M. Tanaka, M. Ito, S. Izawa, Y. Fukunishi

Japan-Indonesia Welding Seminar 2014　2014/05
Wind of Smart Arc Welding Technology in Japan Invited

M. Tanaka, M. Shigeta, K. Konishi, A. Murata, T. Murata

Japan-Indonesia Welding Seminar 2014　2014/05
Developmentof a GMAW Process with Dual Contact Tubes Invited

M. Tanaka, M. Shigeta, S. Tashiro, T. Era

IIW International Congress 2014　2014/04
Models of nano-powder formation in thermal plasma synthesis Invited

M. Shigeta

4th International Round Table on Thermal Plasmas for Industrial Applications: Challenges and Opportunities　2014/03
A Wind of Smart Arc Welding Technology in Japan Invited

M. Tanaka, M. Shigeta, K. Konishi

4th International Round Table on Thermal Plasmas for Industrial Applications: Challenges and Opportunities　2014/03
粒子法によるアーク溶融池の数値シミュレーション

茂田正哉

大阪大学接合科学研究所東京セミナー「可視化による溶接科学の未踏領域への誘い」　2013/12
熱プラズマを用いたナノ粒子群生成の諸現象に関する数理モデル Invited

茂田正哉

第23回日本MRS年次大会(日本MRS学術シンポジウム)　2013/12
SPH Simulation for Weld Pool Flows in TIG Welding Invited

Masaya Shigeta, Manabu Tanaka, Masumi Ito, Seiichiro Izawa, Yu Fukunishi

3rd China-Japan Workshop on Welding Thermo-Physics　2013/11
A Wind of Smart Arc Welding Technology in Japan Invited

M. Tanaka, M. Shigeta, K. Konishi

3rd China-Japan Workshop on Welding Thermo-Physics　2013/11

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Research Projects 18

植物種皮－プラズマ界面物理のシミュレーション科学の創成

伊藤篤史, 茂田正哉, 高柳昌芳

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 学術変革領域研究(A)

Institution: 核融合科学研究所

2024/04/01 - 2029/03/31
Synthesis of all-solid-state lithium-ion battery materials based on investigation of nanoparticle formation in thermal plasma

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Kyushu University

2024/04/01 - 2027/03/31
Innovative technology for controlled synthesis of reactive species by elucidating spatio-temporal dynamics of plasma gas-liquid interfacial reactions

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (S)

Institution: Tohoku University

2022/04/27 - 2027/03/31
低次元界面液体におけるプラズマ電荷・活性種の時空間ダイナミクスの体系的解明

金子俊郎, 高島圭介, 佐々木渉太, 茂田正哉

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(A)

Institution: 東北大学

2022/04/01 - 2026/03/31
Diode-rectified AC arc source for diatomite-derived porous silicon formation

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Kyushu University

2022/04/01 - 2025/03/31
多機能高送達性ナノ粒子シングルステップ合成を実現する超臨界プラズマ流の創成と制御

茂田正哉, 田中学

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2021/04/01 - 2024/03/31
Precise structure control of nano-composite films in low-temperature plasma reaction field with fast flow

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Meijo University

2021/04/01 - 2024/03/31
Rapid deposition of oxide semiconductor film by innovative atmospheric solution precursor spray using vortex thermal plasma flow

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Ashikaga University

2020/04/01 - 2023/03/31
Development of Environmental Process based on Physical and Chemical Phenomena of Multiphase Nanofluidic Plasma

Watanabe Takayuki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Kyushu University

2019/04/01 - 2022/03/31

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Decomposition of waste solution was demonstrated by water thermal plasma with mist generation. This is due to a large amount of H, O, and OH radicals in the water plasma. The developed system enables high energy efficiency and a compact design compared to conventional thermal plasma generators. A new waste treatment process utilizing the high chemical activity of water plasma was developed based on the high enthalpy feature of the plasma.
Development of one-step synthesis of organic-modified nanopowder by supercritical plasma flow control

Shigeta Masaya

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

2018/04/01 - 2021/03/31

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The objective of this study is to develop one-step mass-production of deliverable nanoparticles by a supercritical plasma flow controlling the nanoparticles' yield, size, and composition on the basis of fluid mechanics. An experimental system that simultaneously generated supercritical plasma and nanoparticles from electrode erosion was developed. The experimental and theoretical studies elucidated the mechanism of metal ion transport through the plasma and the correlation between fluid dynamic instability at the plasma fringe and the nanoparticle distribution. Furthermore, numerical analyses revealed a collective growth of functional alloy nanoparticles and a detachment process of a mixed metal droplet from a dissimilar core-shell electrode.
Development of multi-physics simulator for process optimization of waste treatment by water plasma

Shigeta Masaya

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Osaka University

2016/04/01 - 2019/03/31

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The purpose of this study is to develop a comprehensive simulator which can predict flow dynamics and material decomposition in intensively high-temperature environment around 10,000 K and reproduction-transport processes of hazardous by-products in waste detoxification treatments by water plasma. The processes of eddy generation and ultrafine particle formation via homogeneous nucleation, heterogeneous condensation, and interparticle coagulation in the region where plasma and non-ionized gas interact were simulated successfully. The simulation indicated that these processes could be controlled by applying a magnetic field. Furthermore, complicated flows with melting, surface deformation, and Marangoni effect in a mixed system of metal, slag, and flux were simulated as well.
Development of supercritical plasma flow field aiming at one-step synthesis of composite nanoparticles for drug delivery

SHIGETA Masaya, WATANABE Takayuki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Osaka University

2015/04/01 - 2018/03/31

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The objective of this study is to develop one-step mass-production of deliverable nanoparticles by a supercritical plasma flow controlling the nanoparticles' yield, size, and composition on the basis of fluid mechanics. An experiment system consisting of a pressure-proof chamber to produce and sustain supercritical fluid and an electric power supplier capable of generating plasma under a high pressure was designed and constructed. The correlations between the flow characteristics of supercritical plasma and the material characteristics of products were clarified by experimental and theoretical approaches. Experimental methods to measure the plasma's characteristics and mathematical models to analyze the mechanisms were developed as well.
DYNAMIC TRANSPORTATION OF METAL VAPOR BY PLASMA JET AND VISUALIZATION OF HEAT TRANSPORTATION IN WELDING ARCS

TANAKA MANABU

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Osaka University

2014/04/01 - 2017/03/31

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In order to evolve arc welding process from a skilled technique into a technology based on the science, this study aims at experimental understandings of dynamic plasma temperature and metal vapor density during arc welding process. Furthermore, this study focuses on visualizations of quantitative heat transportation phenomena together with metal vapor transportation by the plasma jet, through numerical simulations. The above experimental and numerical analyses have revealed the effect of arc plasma dynamics on the weld pool formation which is important for welding technology.
Development of Waste Treatment Process by Water Plasmas

WATANABE Takayuki, SHIGETA Masaya

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

2011/04/01 - 2014/03/31

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A DC arc water plasma torch which is operated at atmospheric pressure by using evaporated cooling water as plasma forming gas directly. Since a large amount of H, O, and OH radicals are generated in water plasma, decomposition of hazardous materials and waste are accelerated in the treatment of water-soluble organic compounds. Since there are many water-insoluble organic wastes as well as water soluble organic waste, their decomposition was attempted in the present work. Reaction mechanism was investigated in the decomposition region with high-temperature over 10,000 K and the recombination region with 1,000 K. The intermediate products of CH and CH3 radicals were identified, and their contribution on the decomposition mechanism was clarified.
Development of Atmospheric Intermediate-Temperature Plasma Flow System for Synthesis of Biocompatible Nanomaterials

SHIGETA Masaya, WATANABE Takayuki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

2011 - 2013

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From the viewpoints of chemical engineering and fluid mechanics, experimental, theoretical and numerical studies were carried out to investigate the fundamental processes that are involved in the biocompatible nanomaterial synthesis using a reactive thermofluid field of plasma. In consequence, the simultaneous processes of the collective growth and convective/diffusive transports of nanoparticles and the turbulent behavior of an atmospheric plasma flow were clarified. Furthermore, fluid-dynamic instabilities on dynamic separation, boundary layer receptivity for local external disturbance and interaction between a streaky structure and a jet flow were revealed. In addition, it was demonstrated that SPH method was applicable to the breakup process of precursory solution in a plasma flow.
熱水プルームの流体数値シミュレーションによる拡散過程の解析

茂田正哉

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 新学術領域研究(研究領域提案型)

Institution: 東北大学

2009 - 2010

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本年度は前年度に構築した有限差分法による数値計算モデルを現実の問題に適用し,熱水噴出に伴う流れの3次元数値解析を行った.具体的には,熱水活動の確認されている現実の深海カルデラ内の流れについて数値計算を行い,流れの構造を調べた.既に得られている観測データから,一般にカルデラより上部では温度や塩分濃度が成層状態であるのに対して,熱水活動の見られるカルデラ内では温度や塩分濃度が水深によらず一定であることが分かっている.しかし,温度および塩分濃度が均一化するメカニズムについては,これまで解明されていなかった.本研究では,実際の複雑なカルデラ形状も考慮しながら,粒子法および有限差分法による詳細かつ大規模な3次元数値シミュレーションを試みた.その結果,カルデラ内の温度や塩分濃度の均一化は,熱水プルームを駆動力とした対流による混合作用により促進されることを明示した.カルデラ内において噴出した高温低密度の熱水は浮力により上方への流れを生むが,浮力と重力が釣り合う高さで水平方向へと広がる一方,熱水プルームの周囲から低温高密度の流体が流れ込むことによって,カルデラ内に大規模な対流が発生し,最終的に温度や塩分濃度が均一となるというメカニズムを示した.また,深海の熱水噴出による流れの数値計算モデルの確立のために,随時「海底下の大河」計画に携わる研究者等との意見交換を行い,現実の深海の熱水活動に関する情報を得て研究を遂行した.熱水噴出孔の位置や規模を変化させて数値計算を行うことで流れ場の特徴を捉え,観測された温度等のデータから流れの構造や熱水噴出孔の位置の特定を試み,本モデルによる流体数値シミュレーションの現実的な利用を目指した.
Development of novel control devices for plasma synthesis of nanoparticles using turbulence excitation

SHIGETA Masaya

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Young Scientists (B)

Institution: Tohoku University

2008 - 2010

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The objective of this study is to develop the device that produces desired nanoparticles by controlling the turbulent fluctuation field in a plasma flow. The interaction between the plasma flow field and the generation/growth process of nanoparticles is clarified by the unique mathematical model. The SPH method is also developed to simulate complicated thermofluid fields. Furthermore, the turbulent instability and the relation between the vortex structure and the sound generation are investigated and controlled experimentally.
医療・環境浄化用ナノ粒子プラズマ流体システムの最適制御

茂田正哉

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 若手研究(スタートアップ)

Institution: 東北大学

2006 - 2007

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本研究の目的は,汎と用的・高効率・高精度のサイズ選別性および高制御性を有する医療・環境浄化用ナノ粒子創製のためのプラズマ流体システムの最適制御を実現することで,医療(バイオ)工学・環境科学・ヘルスサイエンスの分野に学術的かつ社会的に貢献することである. 機能性ナノ粒子創製の素過程は当該研究により明らかにされつつあるが,依然として詳細は未解明であり,産業レベルにおける粒径・組成・物質機能の制御性は高くはない.そこで本研究では原料の瞬間的蒸発および核生長を同時に行えるプラズマ流を利用した創製プロセスに焦点を当てきた. プラズマ流は流体力学・熱力学・伝熱学・電磁気学の立場から複雑干渉系として定式化され,さらに異種気体の混合により化学反応場さえ制御可能になるという利点に着目し,実験計測の困難な熱流動場の詳細な情報を数値計算によって得ることに成功した.加えて機能性ナノ粒子の核生成および共凝縮過程のみならず,凝集,拡散,熱泳動をも考慮した創製過程の新たな物理モデルを構築し,実験研究結果との比較を行い,粒径分布や組成の一致が得られたことから,プラズマ流による機能性ナノ粒子創製プロセスのモデル化に成功し,創製機構を明らかにすることができたと言える.さらにナノ粒子創製プロセスを促進するための効果的な急冷方法についても数値計算を用いた仮想実験を行うことで,最適な装置の設計指針を明示することができた. 以上の成果はJournal of Physics D: Applied Physicsの特集号「Plasma-aided Fabrication of Nanostructures and Nanoassemblies: Main Features and Competitive Advantages」に招待論文として掲載されるなど,プラズマ材料科学の分野における相応の評価が得られていると言える.

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