Details of the Researcher

PHOTO

Masaya Shigeta
Section
Graduate School of Engineering
Job title
Professor
Degree

  • 博士（工学）（東北大学）

  • 修士（工学）（東北大学）

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 (2019-2023)
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 35

  • 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

    2020/01 - 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

  • 日本伝熱学会東北支部　副支部長（企画）

    2024/05 - Present

  • 日本流体力学会年会2024実行委員会　副委員長

    2023/05 - Present

  • 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

  • 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 - Present

  • (一社)溶接学会　査読委員会 第一部門 部門長

    2022/04 - Present

  • 日本学術振興会　科学研究費専門委員

    2020/04 - Present

  • (一社)スマートプロセス学会　編集委員会 委員

    2018/04 - 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　全国大会運営委員会 委員

    2014/06 - 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)日本溶接協会　学識委員

    2022/10 - 2024/09

  • (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)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 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 29

  1. 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

  2. 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

  3. 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

  4. 溶接技術奨励賞

    2024/05　溶接学会東北支部

  5. 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

  6. 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

  7. 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

  8. 貢献表彰

    2021/11　日本機械学会流体工学部門

  9. 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

  10. 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

  11. 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

  12. 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

  13. 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

  14. 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

  15. 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

  16. 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

  17. 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

  18. 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

  19. 大阪大学賞（若手教員部門）

    2017/11　大阪大学

  20. Thermal Engineering Best Paper Award

    2016/08　Numerical Analysis of Convective Transfer of Nanopowder Generated around a Turbulent-Like Thermal Plasma Jet

  21. 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

  22. 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

  23. 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

  24. Osaka University Presidential Awards for Encouragement

    2015/07　Osaka University

  25. Award for Encouragement of Research

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

  26. 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

  27. 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

  28. 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

  29. 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 228

  1. 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

  2. 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.

  3. 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

  4. 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 　

  5. 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 　

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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

  13. 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.

  14. 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

  15. 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

  16. 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

  17. 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.

  18. 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.

  19. 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

  20. 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.

  21. 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

  22. 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

  23. 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

  24. 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

  25. 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

  26. 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

  27. 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

  28. 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

    More details Close

    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.

  29. 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

  30. 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

  31. 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

  32. 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 　

  33. 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

  34. 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

  35. 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

  36. 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

  37. 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

  38. 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

  39. 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

  40. 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

  41. 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

  42. 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 　

  43. 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

  44. 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

  45. 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

  46. 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

  47. 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 　

  48. 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

  49. 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 　

  50. 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

  51. 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 　

  52. 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 　

  53. 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 　

  54. 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

  55. 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 　

  56. 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

  57. 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 　

  58. 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

  59. 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

  60. 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

  61. 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

  62. 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

  63. 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

  64. 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

  65. 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

  66. 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

  67. 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

  68. 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

  69. 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

  70. 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

  71. 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

  72. 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

  73. 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

  74. 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

  75. 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 　

    More details Close

    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.

  76. 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

  77. 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 　

  78. 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

  79. 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

  80. 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

  81. 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

  82. 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

  83. 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

  84. 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

  85. 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

  86. 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

  87. 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

  88. 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

  89. 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

  90. 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

  91. 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

  92. 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

  93. 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

  94. 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

  95. 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

  96. 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

  97. 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

  98. 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

  99. 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

  100. 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 　

  101. 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 　

  102. 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 　

  103. 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 　

  104. 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

  105. 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 　

  106. 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

  107. 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

  108. 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

  109. 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

  110. 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

  111. 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

  112. 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

  113. 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

  114. 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

  115. 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 　

  116. 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 　

  117. 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 　

  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

  119. 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

  120. 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 　

  121. 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

  122. 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 　

  123. 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

  124. 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

  125. 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 　

  126. 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

  127. 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

  128. 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

  129. 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

  130. 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

  131. 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 　

  132. 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 　

  133. 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 　

  134. 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 　

  135. 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 　

  136. 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

  137. 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

  138. 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

  139. 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

  140. 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

  141. 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

  142. 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

  143. 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

  144. 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

  145. 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

  146. 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

  147. 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 　

  148. 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

  149. 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

  150. 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

  151. 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

  152. 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

  153. 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

  154. 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

  155. 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

  156. 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

  157. 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

  158. 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

  159. 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

  160. 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

  161. 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

  162. 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

  163. 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

  164. 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

  165. 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

  166. 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

  167. 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

  168. Nanoparticle synthesis by thermal plasmas Peer-reviewed

    Watanabe T, Shigeta M

    Nanomaterials: Properties, Preparation and Processes　115-176　2011

  169. 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

  170. 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 　

  171. 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

  172. 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

  173. 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

  174. 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

  175. 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

  176. 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

  177. 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 　

    More details Close

    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.

  178. 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 　

    More details Close

    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.

  179. 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

  180. 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

  181. Nanoparticle synthesis by thermal plasmas Peer-reviewed

    Watanabe T, Shigeta M

    Nanoparticles: Properties, Classification, Characterization, and Fabrication　149-212　2010

  182. 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

  183. 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

  184. 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 　

  185. 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.

  186. 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.

  187. 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

  188. 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

  189. 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

  190. 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

  191. 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

  192. 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

  193. 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

  194. 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.

  195. 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.

  196. 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.

  197. 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

  198. 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

  199. 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

  200. 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.

  201. 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.

  202. 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

  203. 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

  204. 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

  205. 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

  206. 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

  207. 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.

  208. 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.

  209. 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.

  210. 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

  211. 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

  212. 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

  213. 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 　

  214. 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

  215. 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

  216. 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

  217. 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

  218. 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

  219. 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

  220. 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

  221. 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

  222. 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

  223. 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

  224. 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

  225. 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

  226. 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

  227. 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

  228. 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:

Show all ︎Show first 5

Misc. 117

  1. 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 　

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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

  13. 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

  14. 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

  15. 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

  16. 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

  17. 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

  18. 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

  19. 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

  20. 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

  21. 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

  22. 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

  23. 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

  24. 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

  25. 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

  26. 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

  27. 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

  28. 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

  29. 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

  30. 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.

  31. 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

  32. 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

  33. 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.

  34. 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.

  35. 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

  36. 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

  37. 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.

  38. 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.

  39. 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

  40. 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

  41. 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

  42. 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

  43. 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

  44. 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

  45. 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.

  46. 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.

  47. 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

  48. 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

  49. 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.

  50. 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.

  51. 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.

  52. 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.

  53. 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.

  54. 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

  55. 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

  56. 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

  57. 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

  58. 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.

  59. 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.

  60. 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

  61. 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

  62. 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

  63. 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

  64. 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

  65. 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

  66. 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

  67. 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.

  68. 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

  69. 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

  70. 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

  71. 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

  72. 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

  73. 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.

  74. 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.

  75. 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.

  76. 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.

  77. 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.

  78. 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

  79. 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

  80. 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

  81. 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

  82. 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

  83. 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

  84. 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

  85. 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.

  86. 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.

  87. 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

    More details Close

    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.

  88. 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

  89. 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

  90. 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

  91. 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

  92. 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

  93. 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

  94. 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

  95. 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

  96. 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.

  97. 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

    More details Close

    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.

  98. 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

    More details Close

    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.

  99. 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

    More details Close

    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.

  100. 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

    More details Close

    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.

  101. 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

  102. 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

  103. 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

  104. 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

  105. 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.

  106. 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

    More details Close

    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.

  107. 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

    More details Close

    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.

  108. 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.

  109. 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

  110. 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

    More details Close

    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.

  111. 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

  112. 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

  113. 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

  114. 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.

  115. 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

    More details Close

    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.

  116. 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

  117. (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

Show all ︎Show first 5

Books and Other Publications 1

  1. 新溶接アーク現象

    産報出版株式会社　2021/06/01

Presentations 158

  1. Recent progress of computational welding processes Invited

    2025/03/12

  2. The Difficulty and Charm of Computational Plasma Fluid Mechanics Invited

    Czech – Japan Thermomechanics Workshop　2025/02/26

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. Introduction of Computational Plasma Fluid Mechanics Invited

    Masaya Shigeta

    2024 C-MAST (Center for Mechanical and Aerospace Science and Technology) SEMINARS　2024/10/24

  11. 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

  12. 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

  13. 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

  14. 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

  15. 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

  16. 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

  17. 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

  18. 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

  19. 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

  20. 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

  21. 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

  22. 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

  23. 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

  24. 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

  25. 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

  26. 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

  27. 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

  28. 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

  29. 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

  30. 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

  31. 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

  32. 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

  33. 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

  34. 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

  35. 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

  36. 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

  37. 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

  38. 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

  39. 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

  40. 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

  41. 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

  42. 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

  43. 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

  44. 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

  45. 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

  46. 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

  47. 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

  48. 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

  49. 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

  50. 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

  51. 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

  52. 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

  53. 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

  54. 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

  55. 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

  56. 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

  57. 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

  58. 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

  59. 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

  60. 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

  61. 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

  62. 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

  63. 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

  64. 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

  65. 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

  66. 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

  67. 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

  68. 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

  69. 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

  70. 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

  71. 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

  72. 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

  73. 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

  74. 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

  75. 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

  76. 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

  77. 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

  78. 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

  79. 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

  80. 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

  81. 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

  82. 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

  83. 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

  84. 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

  85. 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

  86. 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

  87. 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

  88. 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

  89. 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

  90. 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

  91. 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

  92. 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

  93. 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

  94. 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

  95. 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

  96. 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

  97. 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

  98. 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

  99. 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

  100. 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

  101. 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

  102. 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

  103. 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

  104. 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

  105. 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

  106. Modelling and Simulation of Turbulent Thermal Plasma Flows for Nanopowder Mass Production Invited

    Masaya Shigeta

    7th Plasma Science & Entrepreneurship workshop　2020/11

  107. 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

  108. 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

  109. 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

  110. 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

  111. To simulate turbulent thermal plasma flows for nanopowder fabrication Invited

    Masaya Shigeta

    24th International Symposium on Plasma Chemistry (ISPC24)　2019/06

  112. 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

  113. 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

  114. 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

  115. 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

  116. 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

  117. 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

  118. 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

  119. 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

  120. Modelling for Thermal Plasma Flow Dynamics Invited

    Masaya Shigeta

    19th International Congress on Plasama Physics (ICPP2018)　2018/06

  121. 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

  122. 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

  123. 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

  124. Simulation of ambient gas entrainment into a thermal plasma flow Invited

    Masaya SHIGETA, Manabu TANAKA

    70th IIW Annual Assembly and International Conference　2017/06

  125. 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

  126. 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

  127. 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

  128. 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

  129. 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

  130. 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

  131. 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

  132. 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

  133. 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

  134. 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

  135. 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

  136. 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

  137. 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

  138. 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

  139. 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

  140. 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

  141. 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

  142. 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

  143. 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

  144. 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

  145. 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

  146. 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

  147. 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

  148. 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

  149. 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

  150. 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

  151. 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

  152. Developmentof a GMAW Process with Dual Contact Tubes Invited

    M. Tanaka, M. Shigeta, S. Tashiro, T. Era

    IIW International Congress 2014　2014/04

  153. 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

  154. 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

  155. 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

  156. 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

  157. 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

  158. 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

Show all Show first 5

Research Projects 17

  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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.

  9. 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.

  10. 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.

  11. 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.

  12. 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.

  13. 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.

  14. 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.

  15. 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.

  16. 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.

  17. 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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Social Activities 4

  1. 流体力学の基礎

    計算力学技術者認定試験対策講習会 No.24-84 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)

    2024/10/26 - 2024

  2. 流体力学の基礎

    計算力学技術者認定試験対策講習会 No.23-72 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 - 2023/10/21

  3. すぐにわかる変化球のしくみ ～流れの科学と接合の科学～

    知の拠点【すぐわかアカデミア。】

    2020/04/16 - 2020/04/16

  4. 溶接ヒュームの集団形成過程のシミュレーション

    平成29年度溶接工学専門講座「ものづくり力伝承講座 ～溶接プロセスの可視化を極める～」 IIW国際溶接技術資格制度「特認コース」：J-ANB認定講座 ISO14731/WES8103溶接管理技術者再認証審査クレジットポイント対象講座

    2017/11/10 - 2017/11/10