Details of the Researcher

PHOTO

Jun Ishimoto
Section
Institute of Fluid Science
Job title
Professor
Degree

  • 博士（工学）(東北大学)

  • 修士（工学）(東北大学)

Research History 5

  • 2012/04 - Present
    Tohoku University　Institute of Fluid Science　Professor

  • 1999/04 - 2005/03
    弘前大学理工学部知能機械システム工学科　助教授

  • 1996/05 - 1999/03
    東北大学流体科学研究所　助手

  • 1995/04 - 1996/04
    日本学術振興会特別研究員（ＰＤ）

  • 2005/04 -
    Institute of Fluid Science, Tohoku University　Associate Professor

Education 1

  • Tohoku University　Graduate School, Division of Engineering　機械工学第二専攻

    - 1995/03

Committee Memberships 26

  • The Japan Society of Mechanical Engineers　37th Computational Mechanics Conference (CMD2024) Executive Committee Chairman

    2023/04 - Present

  • 日本機械学会　交通・物流部門代議員

    2014/04 - 2016/03

  • 日本機械学会　交通・物流部門代議員

    2014/04 - 2016/03

  • 日本混相流学会　評議員

    2014/04 - 2015/03

  • 日本混相流学会　評議員

    2014/04 - 2015/03

  • 日本機械学会　2014年度（第92期）計算力学部門 計算力学講演会担当委員会（2014） 委員

    2014/01 - 2015/03

  • 日本機械学会　2014年度（第92期）計算力学部門 計算力学講演会担当委員会（2014） 委員

    2014/01 - 2015/03

  • 12th International Conference on Magnetic Fluids, Sendai, Japan　実行委員

    2008/04 - 2010/08

  • 12th International Conference on Magnetic Fluids, Sendai, Japan　実行委員

    2008/04 - 2010/08

  • 国際宇宙ステーション・きぼう利用推進委員会 領域別パネルレビューア　領域別パネルレビューア

    2009/04 - 2010/03

  • 国際宇宙ステーション・きぼう利用推進委員会 領域別パネルレビューア　領域別パネルレビューア

    2009/04 - 2010/03

  • 日本機械学会　2009年度年次大会実行委員

    2008/04 - 2009/10

  • 日本機械学会　2009年度年次大会実行委員

    2008/04 - 2009/10

  • 日本混相流学会　評議員

    2004/04 - 2005/03

  • 日本混相流学会　評議員

    2004/04 - 2005/03

  • 日本機械学会　代表会員

    2020/04 -

  • 日本混相流学会 研究企画委員会 サステナブル異分野融合型混相流 分科会　主査

    2010/08 -

  • 日本混相流学会 研究企画委員会 サステナブル異分野融合型混相流 分科会　主査

    2010/08 -

  • 日本混相流学会　論文審査委員

    2010/07 -

  • 日本混相流学会　論文審査委員

    2010/07 -

  • 日本機械学会 第88期 産業・化学機械と安全部門　代議員

    2010/04 -

  • 日本機械学会 第88期（2010年度）流体工学部門運営委員　運営委員

    2010/04 -

  • 日本機械学会 第88期 産業・化学機械と安全部門　代議員

    2010/04 -

  • 日本機械学会 第88期（2010年度）流体工学部門運営委員　運営委員

    2010/04 -

  • 日本機械学会・宇宙工学部門運営委員　第3企画委員会委員長

    2008/04 -

  • 日本機械学会・宇宙工学部門運営委員　第3企画委員会委員長

    2008/04 -

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Professional Memberships 8

  • 自動車技術会

  • 日本流体力学会

  • 可視化情報学会

  • 日本航空宇宙学会

  • 低温工学会

  • 日本混相流学会

  • ASME

  • 日本機械学会

︎Show all ︎Show first 5

Research Interests 5

  • CFD

  • Atomization

  • Cryogenics

  • Fluid mechanics

  • Multiphae Flow

Research Areas 4

  • Nanotechnology/Materials / Energy chemistry /

  • Aerospace, marine, and maritime Engineering / Aerospace engineering /

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Thermal engineering /

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

Awards 14

  1. ASME Journal of Tribology, 2023 Best Paper Award

    2024/09　ASME（The American Society of Mechanical Engineers)　Computational Fluid–Structure Interaction Analysis of Piston Pin Multiphase Elastohydrodynamic Lubrication With Unsteady Flow Channel Variation

  2. Cryogenics Best Paper Award 2009

    2010/07/22　Elsevier B.V.

  3. 2023 The Japan Society of Multiphase Flow Award for Outstanding Paper

    2024/09　The Japanese Society for Multiphase Flow　Elucidation of the elastohydrodynamic lubrication phenomenon involving phase change through multiphase fluid-structure interaction analysis

  4. 令和5年度 論文賞

    2023/05　日本鋳造工学会　混相流解析によるアルミニウム合金ダイカスト溶湯の微視的型内流れの可視化及び定量化

  5. 2023 The Japan Society of Multiphase Flow Technology Award

    2014/08

  6. WHEC Awards for Excellence Presentation

    2014/06/20　WHEC　Supercomputing of Safety and Risk Assessment for Multiphase High Density Hydrogen

  7. 日本機械学会流体工学部門フロンティア表彰

    2010/10/30　日本機械学会

  8. 可視化情報学会第20期映像賞・フラッシュオブザイヤー

    2009/07/21　(社) 可視化情報学会　マイクロキャビテーションを伴うガソリンインジェクター乱流噴霧微粒化プロセスに関する融合可視化シミュレーション

  9. 日本混相流学会賞「技術賞」

    2008/08/09　日本混相流学会　極低温スラッシュ流体を利用した混相冷却法の開発

  10. 日本混相流学会論文賞

    2003/07　日本混相流学会　多流体モデルを用いた液体ヘリウム管内二相流の数値解析

  11. インテリジェントコスモス奨励賞

    2003/05　インテリジェントコスモス財団　超流動ヘリウムキャビテーション流れの活用による新型冷却システムの開発

  12. 日本混相流学会萌芽賞

    1998/07　日本混相流学会　磁性流体気液二相流を用いたエネルギー変換システムに関する研究

  13. 日本混相流学会ベストプレゼンテーション賞

    1996/07　日本混相流学会　磁性流体気液二相流における非線形波動の伝播に関する研究

  14. 日本機械学会賞（研究奨励賞）

    1996/05　日本機械学会　磁性流体沸騰二相流を用いたエネルギー変換システムに関する研究

Show all ︎Show 5

Papers 184

  1. Coupled computing for reactive hydrogen leakage phenomena with crack propagation in a pressure tank Peer-reviewed

    Jun Ishimoto, Satoru Shimada

    International Journal of Hydrogen Energy　47　(4)　2735-2758　2022/01/12

    DOI： 10.1016/j.ijhydene.2021.10.167 　

    ISSN： 0360-3199

  2. Oscillatory two-phase flow dynamics in capillary tubes under microgravity conditions: Numerical modeling and qualitative analysis of the flow structures Peer-reviewed

    Tomasz Duraziński, Andrzej Ireneusz Nowak, Jun Ishimoto, Sławomir Pietrowicz

    International Journal of Multiphase Flow　184　105107-105107　2025/03

    Publisher: Elsevier BV

    DOI： 10.1016/j.ijmultiphaseflow.2024.105107 　

    ISSN： 0301-9322

  3. Comprehensive numerical modeling analysis and experimental validation of a multi-turn pulsating heat pipe Peer-reviewed

    Marcin Opalski, Cezary Czajkowski, Przemysław Błasiak, Andrzej Ireneusz Nowak, Jun Ishimoto, Sławomir Pietrowicz

    International Communications in Heat and Mass Transfer　159　107990-107990　2024/12

    Publisher: Elsevier BV

    DOI： 10.1016/j.icheatmasstransfer.2024.107990 　

    ISSN： 0735-1933

  4. Coupled Computing of Fluid-Structure Interaction Problems for Multiphase Energy Systems,

    J. Ishimoto, T. Elguedj

    Proceedings of the The 21st International Conference on Flow Dynamics (ICFD2024) OS25: AFI-2024 IFS Lyon Center Collaborative Research Forum　2024/11/18

  5. Geometric Effect on the Aerodynamics of a Spinning Hollow Cylinder in Flight

    K. Oguchi, D. Tanaka, M. Nakano, J. Ishimoto, T. Adachi, K. Hirata

    Proceedings of the The 21st International Conference on Flow Dynamics (ICFD2024)　2024/11/18

  6. Non-steady CFD Analysis of Gas-liquid Mixing of Non-Newtonian Fermentation of Filamentous Fungi

    S. Susukida, K. Muto, K. Miyazawa, A. Yoshimi, Y. Kato, J. Ishimoto, K. Abe

    Proceedings of the The 21st International Conference on Flow Dynamics (ICFD2024)　2024/11/18

  7. Supercomputing of Cryogenic Fine Solid Nitrogen Particle Production Using Laval Nozzle for Physical Photo Resist Removal-Cleaning Technology Peer-reviewed

    Jun Ishimoto

    Proceedings of the 29th International Cryogenic Engineering Conference, International Cryogenic Materials Conference 2024, July 22-26, 2024, Geneva, Switzerland　USB memory　2024/07

  8. Supercomputing of Liquid Ammonia Atomization Characteristics in a Swirl Injector Nozzle Peer-reviewed

    Jun Ishimoto

    Proceedings of the ICLASS 2024, 16th Triennial International Conference on Liquid Atomization and Spray Systems, Shanghai, China　USB memory　5-29　2024/06

  9. Computational prediction of surface-tension flow mechanism of molten filler in a V-shaped groove geometry in the brazing process of a heat exchanger Peer-reviewed

    Hiroshi Otsuki, Jun Ishimoto, Naoki Ogasawara, Takumi Abe, Yoshikatsu Nakano

    The International Journal of Advanced Manufacturing Technology　128　(11-12)　4819-4842　2023/09/04

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s00170-023-12222-2 　

    ISSN： 0268-3768

    eISSN： 1433-3015

    More details Close

    Abstract When the temperature rises during the brazing process, only the brazing material melts because of its low melting point. Several analytical approaches have been used to describe filler flow in channels and the progression of erosion grooves. However, only a few studies have examined filler-flow behavior in microgrooves during brazing. In this study, a computational model was constructed to examine the flow in microgrooves on an extruded material’s surface. The capillary flow of the aluminum brazing material was numerically analyzed to investigate the physical properties and surface behavior. Specifically, the surface-tension flow behavior was analyzed by simulating various cross-sectional shapes of the channel grooves and various contact angles of the filler. The effects of various parameters, such as viscosity and boundary conditions, on the filler flow were also analyzed. When the cross-sectional area of the channel groove increases, the filler-flow velocity increases, and the rate of unsteady fluctuation increases with the increasing filler tip velocity. The driving force of the filler flow in the channel groove is considered to be (1) the surface tension, which is based on the filler free-surface curvature, or (2) the dynamic change in the shape of the meniscus, which can be unsteady and induced by Rayleigh–Taylor instability. As the cross-sectional area of the channel groove increases, the capillary force based on the dynamic change in meniscus shape dominates the unsteady change in filler tip velocity, rather than the surface tension based on the filler free-surface curvature formed in the groove.

  10. Visualization of Microscopic Behavior of Atomized Flow in High-Pressure Die Casting Products Using a Multiphase Flow Analysis System Peer-reviewed

    Eitaro Koya, Masahiko Nakagawa, Shinya Kitagawa, Jun Ishimoto, Yoshikatsu Nakano, Naoya Ochiai

    International Journal of Metalcasting　17　(4)　2508-2521　2023/03/28

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s40962-023-01015-8 　

    ISSN： 1939-5981

    eISSN： 2163-3193

  11. Computational Fluid–Structure Interaction Analysis of Piston Pin Multiphase Elastohydrodynamic Lubrication With Unsteady Flow Channel Variation Peer-reviewed

    Yudai Narumi, Jun Ishimoto, Daisuke Kanayama, Hiroshi Kuribara, Yoshikatsu Nakano

    ASME, Journal of Tribology　145　(2)　2022/11/04

    Publisher: ASME International

    DOI： 10.1115/1.4055407 　

    ISSN： 0742-4787

    eISSN： 1528-8897

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    Abstract This research focuses on the multiphase oil film tribology between the piston pin and the connecting rod in an internal combustion engine and establishes a new computational approach for thin-film lubrication with unsteady flow channel variation. First, the pin and the connecting rod are considered as rigid bodies, and 3D numerical analysis of the cavitating lubricating oil flow is performed when combustion load is applied to the pin. We find that dynamic pressure does not increase around the connecting rod edge and that pressure is potentially insufficient to support the load. In the second numerical analysis, the pin and the connecting rod are considered to be elastically deformable structures, and coupled 3D multiphase fluid–structure interaction simulation is performed. The boundary lubrication area is detected using a statistical Greenwood–Tripp model as unevenness of the contacted metal surface. The results show that pressure distribution spreads more widely than in the result for rigid bodies and that the film was thicker as well. Also, the pin deformed like a bow, but the deformation of the connecting rod was quite small, suggesting a potential mechanical contact at the edge of the connecting rod with the pin. By comparison with an actual operationally used piston pin, we find that the fluid–structure coupled analysis qualitatively predicted the seizure location.

  12. Microscopic Visualization and Quantification of Molten Aluminum Alloy Flow Inside Die Cavity by Multiphase Flow Analysis Peer-reviewed

    Eitaro Koya, Masahiko Nakagawa, Shinya Kitagawa, Jun Ishimoto, Yoshikatsu Nakano, Naoya Ochiai

    Journal of Japan Foundry Engineering Society　94　(5)　245-253　2022/05

    DOI： 10.11279/jfes.94.245 　

  13. The cooling performance of the micro-solid nitrogen spray technique on the cryopreservation vitrification process: A qualitative study

    Przemysław Smakulski, Jun Ishimoto, Sławomir Pietrowicz

    International Journal of Heat and Mass Transfer　184　2022/03

    DOI： 10.1016/j.ijheatmasstransfer.2021.122253 　

    ISSN： 0017-9310

  14. The numerical modeling of cell freezing in binary solution under subcooling conditions

    Przemysław Smakulski, Sławomir Pietrowicz, Jun Ishimoto

    International Journal of Numerical Methods for Heat and Fluid Flow　30　(6)　3005-3025　2020/05/22

    Publisher: Emerald Group Holdings Ltd.

    DOI： 10.1108/HFF-12-2018-0740 　

    ISSN： 0961-5539

  15. Numerical analysis of the effect of bubble distribution on multiple-bubble behavior Peer-reviewed

    Naoya Ochiai, Jun Ishimoto

    Ultrasonics Sonochemistry　61　104818-104818　2020/03

    Publisher: Elsevier BV

    DOI： 10.1016/j.ultsonch.2019.104818 　

    ISSN： 1350-4177

  16. Experiment and Numerical Analysis of a Rotating Hollow Cylinder in Free Flight Peer-reviewed

    Yusuke Naito, Romain Montini, Hirochika Tanigawa, Jun Ishimoto, Masami Nakano, Katsuya Hirata

    Advances in Hydroinformatics　923-936　2020

    Publisher: Springer Singapore

    DOI： 10.1007/978-981-15-5436-0_70 　

    ISSN： 2364-6934

    eISSN： 2364-8198

  17. CFD Analysis of Mechanisms Underlying the Porosity-reducing Effect of Atomized Flows in High-pressure Die Cast Products Peer-reviewed

    Eitaro Koya, Masahiko Nakagawa, Shinya Kitagawa, Jun Ishimoto, Yoshikatsu Nakano, Naoya Ochiai

    MATEC Web of Conferences　326　06006-06006　2020

    Publisher: EDP Sciences

    DOI： 10.1051/matecconf/202032606006 　

    eISSN： 2261-236X

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    In high-pressure die casting, attention has been paid to the J factor, which is defined by the speed of the metal injected at the gate and the shape of the gate. In casting experiments using a piston die, the porosity of the product can be reduced by increasing the J factor such that the metal flow passing through the gate forms an atomized flow. To clarify the underlying mechanisms, we developed a system for simulating a two-phase flow of air and aluminum by large-scale calculations of turbulent flow. During the development of the system, we injected metal into an open space and performed imaging to confirm the state of the atomized flow. The system was then verified by reproducing the atomized flow. The analysis results visualized the many small turbulent vortices generated in the thick part far from the gate. We demonstrated that the change from small to longitudinal vortices promoted entrainment of air into the aluminum and increased the efficiency of air expulsion outside the die through an increase in the J factor.

  18. Coupled particle and Euler method for leaked hydrogen-air mixing with crack propagation of pressure vessel Peer-reviewed

    Jun Ishimoto, Toshinori Sato, Alain Combescure

    Proceedings of the 8th European-Japanese Two-Phase Flow Group Meeting, The Watson Hotel in Manhattan, 22nd – 26th, April, 2018, New York, USA. [in USB memory]　2018/04

  19. Photography of atomization flow and LES-VOF simulation of die interior flow behavior under high pressure diecasting

    Eitaro Koya, Masahiko Nakagawa, Shinya Kitagawa, Jun Ishimoto, Yoshikatsu Nakano, Naoya Ochiai

    73rd World Foundry Congress "Creative Foundry", WFC 2018 - Proceedings　393-394　2018

    Publisher: Stowarzyszenie Techniczne Odlewnikow Polskich/Polish Foundrymen's Association

  20. Atomization in High-Pressure Die Casting - Step 2 Simulation of Atomized Flow of Molten Aluminum by LES-VOF Method Peer-reviewed

    Eitaro Koya, Masahiko Nakagawa, Shinya Kitagawa, Jun Ishimoto, Yoshikatsu Nakano, Naoya Ochiai

    SAE Technical Papers　2018-　2018

    Publisher: SAE International

    DOI： 10.4271/2018-01-1393 　

    ISSN： 0148-7191

  21. Research of Atomization Phenomena in HPDC-Step 1 Feature of Gas Porosity Dispersion and Photography of Atomized Flow Peer-reviewed

    Eitaro Koya, Masahiko Nakagawa, Shinya Kitagawa, Jun Ishimoto, Yoshikatsu Nakano, Naoya Ochiai

    SAE Technical Papers　2018-　2018

    Publisher: SAE International

    DOI： 10.4271/2018-01-1392 　

    ISSN： 0148-7191

  22. Numerical research of solidification dynamics with anisotropy and thermal fluctuations Peer-reviewed

    Przemysław Smakulski, Jun Ishimoto, Sławomir Pietrowicz

    MATEC Web of Conferences　240　(05028)　2018

    DOI： 10.1051/matecconf/201824005028 　

  23. Vitrification of Biological Cells Using a Cryogenic Fine Solid Particulate Spray Peer-reviewed

    Jun ISHIMOTO

    Interdisciplinary Information Sciences　2017/08/05

    DOI： 10.4036/iis.2017.S.01 　

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    We have developed a cryopreservation method that uses a single-component super-adiabatic two-fluid de Laval nozzle for the continuous production of solid nitrogen particles with a micro-nano-order particle size. The cell viability results showed that use of the solid nitrogen spray improved cell viability at the time of thawing by more than 20% compared with the conventional liquid nitrogen immersion freezing method. By using the present dynamic spray cooling method that avails of the synergistic effect of impingement heat transfer, convective heat transfer, and evaporation latent heat transfer of solid nitrogen particles, the new vitrification method reduces the cell membrane disruption caused by ice nucleation, crystal growth, and volume expansion.

  24. Numerical investigation of multiple-bubble behavior and induced pressure in a megasonic field Peer-reviewed

    N. Ochiai, J. Ishimoto

    Journal of Fluid Mechanics　818　562-594　2017/04

    DOI： 10.1017/jfm.2017.154 　

  25. Computational approach for hydrogen leakage with crack propagation of pressure vessel wall using coupled particle and Euler method Peer-reviewed

    Jun Ishimoto, Toshinori Sato, Alain Combescure

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　42　(15)　10656-10682　2017/04

    DOI： 10.1016/j.ijhydene.2017.01.161 　

    ISSN： 0360-3199

    eISSN： 1879-3487

  26. Integrated Computational Study for Total Atomization Process of Primary Breakup to Spray Droplet Formation in Injector Nozzle Peer-reviewed

    N. Ochiai, J. Ishimoto, A. Arioka, N. Yamaguchi, Y. Sasaki, N. Furukawa

    SAE Technical Paper　2016-01-2202　2016/10

    DOI： 10.4271/2016-01-2202 　

  27. Computational Study of Unsteady Cavitation in High-Speed Submerged Water Jet

    N. Ochiai, J. Ishimoto

    Proceedings of Thirteenth International Conference on Flow Dynamics　254-255　2016/10

  28. Supercomputing of Multiscale Multiphase Flow Related to Industrial Field and Natural Disaster Problems Invited Peer-reviewed

    Jun Ishimoto

    Proceedings of the 11th Korea-Japan CFD Workshop (KJCFD2015)　2015/12/16

  29. Computational study of the dynamics of two interacting bubbles in a megasonic field Peer-reviewed

    Naoya Ochiai, Jun Ishimoto

    ULTRASONICS SONOCHEMISTRY　26　351-360　2015/09

    DOI： 10.1016/j.ultsonch.2015.04.005 　

    ISSN： 1350-4177

    eISSN： 1873-2828

  30. Innovative glass freezing technologies of biological cell using cryogenic solid particulate spray Peer-reviewed

    Jun Ishimoto

    Proceedings of the CRYO2015 - the 52nd Annual Meeting of the Society for Cryobiology, July 26-29, 2015, Clarion Congress Hotel Ostrava, Ostrava-Zábřeh, Czech Republic. [in USB memory]　2015/07

  31. Cryogenic solid nitrogen particle production through Laval nozzle and its impingement behavior with phase change Invited Peer-reviewed

    Jun Ishimoto

    Proceedings of the EMN Meeting on Droplets 2015, May 8-11, 2015, Phuket, Thailand. [in USB memory]　2015/05/08

  32. Dynamic restriction mechanism for the upper limit of exhaust flow rates in the real-time sensing-based forced ventilation control of leaking hydrogen Peer-reviewed

    Kazuo Matsuura, Masami Nakano, Jun Ishimoto

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　40　(12)　4401-4411　2015/04

    DOI： 10.1016/j.ijhydene.2015.01.092 　

    ISSN： 0360-3199

    eISSN： 1879-3487

  33. Computational prediction of cryogenic micro-nano solid nitrogen particle production using Laval nozzle for physical photo resist removal-cleaning technology Peer-reviewed

    Jun Ishimoto, Haruto Abe, Naoya Ochiai

    PROCEEDINGS OF THE 25TH INTERNATIONAL CRYOGENIC ENGINEERING CONFERENCE AND INTERNATIONAL CRYOGENIC MATERIALS CONFERENCE 2014　67　607-612　2015

    DOI： 10.1016/j.phpro.2015.06.103 　

    ISSN： 1875-3892

  34. Development of Environmental Harmony Resist Removal System using Cryogenic Particulate Spray Peer-reviewed

    Jun Ishimoto, Hideo Horibe

    JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY　28　(2)　285-288　2015

    DOI： 10.2494/photopolymer.28.285 　

    ISSN： 0914-9244

  35. Earthquake - supercomputing and scale modeling the effect of flotsam mixed tsunami: Implications for tsunami generated by the 2011 great east coast earthquake Peer-reviewed

    Jun Ishimoto, Kozo Saito

    Progress in Scale Modeling, Volume II: Selections from the International Symposia on Scale Modeling, ISSM VI (2009) and ISSM VII (2013)　2　45-55　2015/01/01

    Publisher: Springer International Publishing

    DOI： 10.1007/978-3-319-10308-2_3 　

  36. 粒子法を用いた雪の特性モデリングと挙動シミュレーション 第2報 Peer-reviewed

    山本 洋佑, 石本 淳, 落合 直哉

    混相流（混相流研究の進展），Vol. 28, No. 5 (2015) pp. 563-568. http://doi.org/10.3811/jjmf.28.563.　28　(5)　563-568　2015/01

    DOI： 10.3811/jjmf.28.563 　

  37. SNOW PROPERTY MODELING AND ITS APPLICATION TO PARTICULATE ICE-SNOW FLOW COMPUTING IN SNOWBLOWER Peer-reviewed

    Yosuke Yamamoto, Jun Ishimoto, Naoya Ochiai

    PARTICLE-BASED METHODS IV-FUNDAMENTALS AND APPLICATIONS　410-418　2015

  38. Supercomputing of tsunami damage mitigation by offshore mega floating structures Invited Peer-reviewed

    Jun Ishimoto

    Proceedings of the International Innovation Workshop on Tsunami, Snow Avalanche and Flash Flood Energy Dissipation, Oct. 20-21, 2014, Chamonix, France.　2014/10/21

  39. Numerical Investigation of Two Interacting Bubbles Behavior in a Megasonic Field

    Naoya Ochiai, Jun Ishimoto

    Proc. 11th International Conference on Flow Dynamics　2014/10/10

  40. Computational Study of Bubble Behavior for Clarification of Particle Removal Mechanism in Megasonic Cleaning

    Naoya Ochiai, Jun Ishimoto, Jin-Goo Park

    Proc. Fourteenth International Symposium on Advanced Fluid Information　2014/10

  41. Development of Thermomechanical Resist Removal-Cleaning Technology using Cryogenic Micro-Solid Nitrogen Spray

    Jun Ishimoto, Hideo Horibe

    Proceedings of the 11th International Conference on Flow Dynamics (ICFD2014), Oct. 8-10, 2014, Sendai International Center, Sendai, Japan.　2014/10

  42. Dynamic Simulation of Snowblower in Consideration of Snow Characteristic

    Yosuke Yamamoto, Jun Ishimoto, Naoya Ochiai

    The Second International Symposium on Innovative Energy Research III, Multiphase Energy Science and Risk Mitigation　2014/10

  43. Numerical Prediction of Compressible Vapor Flow with LDI Erosion

    Jun Ishimoto, Kazuo Matsuura, Kozo Saito

    Proceedings of the 11th International Conference on Flow Dynamics (ICFD2014), Oct. 8-10, 2014, Sendai International Center, Sendai, Japan.　2014/10

  44. Numerical Study of Flotsam Mixed Tsunami and Tsunami Scale Modeling

    Jun Ishimoto, Kozo Saito

    Proceedings of the 11th International Conference on Flow Dynamics (ICFD2014), Oct. 8-10, 2014, Sendai International Center, Sendai, Japan.　2014/10

  45. Researches on a Sensing-based Dynamic Forced Ventilation Control of Leaking Hydrogen

    Kazuo Matsuura, Masami Nakano, Jun Ishimoto

    Proceedings of the 11th International Conference on Flow Dynamics (ICFD2014), Oct. 8-10, 2014, Sendai International Center, Sendai, Japan.　2014/10

  46. Multiphase High Density Hydrogen Energy and its Risk Assessment Peer-reviewed

    Jun Ishimoto

    Proceedings of The 20th World Hydrogen Energy Conference 2014, June 15-20, 2014, Kimdaejung Convention Center,Gwangju Metropolitan City, Korea.　2014/06

  47. 粒子法を用いた雪の特性モデリングと挙動シミュレーション Peer-reviewed

    山本洋佑, 石本淳, 落合直哉

    混相流研究の進展　未定　2014/04

    DOI： 10.3811/jjmf.27.539 　

  48. Coupled Supercomputing of Fluid and Structure Interaction Caused by Flotsam Mixed Tsunami Peer-reviewed

    Jun Ishimoto

    Proceedings of the 1st International Conference on Computational Engineering and Science for Safety and Environmental Problems (COMPSAFE2014), Sendai International Center, 13-16 April 2014 in Sendai, Japan.　2014/04

  49. Multiscale Coupled Supercomputing of Multiphase Fluid-Material Interaction

    Jun Ishimoto

    Proceedings of the ELyT Workshop 2014 in Frejus, France, February 19 – 21, 2014　2014/02/20

  50. Multiscale coupled computing of multiphase fluid-structure interaction

    Jun Ishimoto

    Proceedings of the 2nd Core-to-Core Workshop ”Japan-China Joint Workshop on Bio, Material and Flow Dynamics, Feb. 27, 2014, IFS, Tohoku University, Sendai, Japan　2014/02

  51. A6 Numerical simulation of interaction force between two bubbles in megasonic field

    Ochiai Naoya, Ishimoto Jun

    Proceedings of the Annual Meeting of the Japan Society of Sonochemistry　23　11-12　2014

    Publisher: The Japan Society of Sonochemistry

    DOI： 10.20577/pamjss.23.0_11 　

    More details Close

    Megasonic cleaning, which uses higher frequency wave at and above 1 MHz, have been studied for efficient cleaning without pattern damage in semiconductor industry. It is necessary to understand multiple bubble behavior in megasonic field for clarification of particle removal mechanism and development of megasonic cleaning. Therefore, in the present study, numerical simulations of two oscillating bubble in megasonic field are performed using compressible locally homogeneous model of a gas-liquid two-phase model. In the case where the equilibrium radii are larger than the resonant radius, the direction of the interaction force between bubbles is found to be reversed due to the strong interaction force when the equilibrium radius is close to the resonant radius. The reversal of the direction results in the characteristic bubbles behavior in which the distance between the bubbles repeats the increasing and decreasing and converges to the constant value.

  52. Numerical Analysis of Single Bubble Behavior in a Megasonic Field by Non-Spherical Eulerian Simulation Peer-reviewed

    Naoya Ochiai, Jun Ishimoto

    ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY　3　(1)　N3112-N3117　2014

    DOI： 10.1149/2.020401jss 　

    ISSN： 2162-8769

  53. Photoresist Removal-Cleaning Technology Using Cryogenic Micro-Solid Nitrogen Spray Peer-reviewed

    Jun Ishimoto, U. Oh, Tomoki Koike, Naoya Ochiai

    ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY　3　(1)　N3046-N3053　2014

    DOI： 10.1149/2.009401jss 　

    ISSN： 2162-8769

  54. Ultra-High Heat Flux Cooling Characteristics of Cryogenic Micro-Solid Nitrogen Particles and Its Application to Semiconductor Wafer Cleaning Technology Peer-reviewed

    Jun Ishimoto, U. Oh, Zhao Guanghan, Tomoki Koike, Naoya Ochiai

    ADVANCES IN CRYOGENIC ENGINEERING　1573　1099-1106　2014

    DOI： 10.1063/1.4860828 　

    ISSN： 0094-243X

  55. Photoresist Removal-Cleaning Technology Using Cryogenic Micro-Solid Nitrogen Spray Peer-reviewed

    Jun Ishimoto, U. Oh, Tomoki Koike, Naoya Ochiai

    ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY　3　(1)　N3046-N3053　2014

    DOI： 10.1149/2.009401jss 　

    ISSN： 2162-8769

  56. The Supercomputing of Fluid and Structure Interaction Caused by Natural Disasters

    Jun Ishimoto

    Proceedings of the International Symposium on Smart Materials and Structures for Energy Saving, Nov. 27, 2013, Sendai International Center, Sendai, Japan.　2013/11/27

  57. Multiphase High Density Hydrogen Energy and its Risk Assessment Invited

    Jun Ishimoto

    Proceedings of the International Symposium on Innovative Energy Research, Nov. 25, 2013, Sendai International Center, Sendai, Japan.　2013/11/25

  58. Computational Study of Bubble Behavior in Semiconductor Cleaning

    N. Ochiai, J. Ishimoto, J.-G. Park

    Proceedings of the Thirteenth International Symposium on Advanced Fluid Information　108-109　2013/11

  59. Frontier Science of Next Generation Reactive Fluid

    Jun Ishimoto, Kaoru Maruta, Takehiko Sato

    Proceedings of the Tenth International Conference on Flow Dynamics (ICFD2013), Nov. 25-27, 2013, Sendai International Center, Sendai, Japan.　2013/11

  60. Numerical Study of High-Speed Condensable Vapor Flow with LDI Erosion

    Jun Ishimoto, Guanghao Wu, Kazuo Matsuura

    Proceedings of the Tenth International Conference on Flow Dynamics (ICFD2013), Nov. 25-27, 2013, Sendai International Center, Sendai, Japan.　2013/11

  61. Researches on a Sensing-Based Dynamic Forced Ventilation Control of Leaking Hydrogen

    Kazuo Matsuura, Masami Nakano, Jun Ishimoto

    Proceedings of the Tenth International Conference on Flow Dynamics (ICFD2013), Nov. 25-27, 2013, Sendai International Center, Sendai, Japan.　2013/11

  62. Supercomputing and Scale Modeling of Flotsam Mixed Tsunami

    Jun Ishimoto, Kozo Saito

    Proceedings of the Tenth International Conference on Flow Dynamics (ICFD2013), Nov. 25-27, 2013, Sendai International Center, Sendai, Japan.　2013/11

  63. Ultra-High Heat Flux Cooling Characteristics of Cryogenic Micro-Solid Nitrogen Particles

    Jun Ishimoto, Naoya Ochiai, Kozo Saito

    Proceedings of the Tenth International Conference on Flow Dynamics (ICFD2013), Nov. 25-27, 2013, Sendai International Center, Sendai, Japan.　2013/11

  64. Multiphase high density hydrogen energy and its risk mitigation, safety problems

    Jun Ishimoto

    Proceedings of the KTH International Workshop on Flow Dynamics related to Energy, Aerospace and Material Processing, KTH, Stockholm, Sweden, September 10-11, 2013　2013/09/11

  65. Supercomputing and Scale Modeling the Effect of Flotsam mixed Tsunami: Implication to Tsunami generated by The 2011 Great East Coast Earthquake Peer-reviewed

    Jun Ishimoto, Kozo Saito

    Proceedings of the Sixth International Symposium on Scale Modeling (ISSM-6) August 6th-8th, 2013, Hirosaki Univ., Hirosaki, Japan.　2013/08/06

  66. Physical Nano-Device Cleaning Technology Using Thermomechanical Effect of Cryogenic Solid Nitrogen

    U Oh, Jun Ishimoto, Jin-Goo Park

    Proceedings of the 2013 ELyT Laboratory Workshop in Zao To-o-gatta, Zao To-o-gatta, Japan, February 17-20, 2013.　2013/02/18

  67. Numerical Study of Single Bubble Dynamics in Megasonic Field for New Physical Cleaning Method Peer-reviewed

    N. Ochiai, J. Ishimoto

    SEMICONDUCTOR CLEANING SCIENCE AND TECHNOLOGY 13 (SCST 13)　58　(6)　77-85　2013

    DOI： 10.1149/05806.0077ecst 　

    ISSN： 1938-5862

  68. Cryogenic Single-Component Micro-Nano Solid Nitrogen Particle Production Using Laval Nozzle for Physical Resist Removal-Cleaning Process Peer-reviewed

    J. Ishimoto, U. Oh, T. Koike, N. Ochiai

    SEMICONDUCTOR CLEANING SCIENCE AND TECHNOLOGY 13 (SCST 13)　58　(6)　231-239　2013

    DOI： 10.1149/05806.0231ecst 　

    ISSN： 1938-5862

  69. Super Computational Study of High-Speed Droplet-Vapor Flow and LDI Erosion

    Jun Ishimoto, Guanghao Wu, Kazuo Matsuura

    Proceedings of the 12th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration, AFI/TFI-2012, Sendai, Miyagi, Japan, Nov. 19-21　2012/11

  70. Numerical Prediction of Cavitation Erosion Using a Coupled Analysis of Cavitating Flow Field and Bubbles

    Naoya Ochiai, Yuka Iga, Motohiko Nohmi, Toshiaki Ikohagi, Jun Ishimoto, Kozo Saito

    Proceedings of the 12th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration, AFI/TFI-2012, Sendai, Miyagi, Japan, Nov. 19-21　2012/11

  71. Thermomechanical Nano Device Resist Removal-Cleaning Technology by Using Cryogenic Spray Flow of Solid Nitrogen

    U Oh, Jun Ishimoto, Jin-Goo Park

    Proceedings of the 12th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration, AFI/TFI-2012, Sendai, Miyagi, Japan, Nov. 19-21　2012/11

  72. Integrated Research Collaboration for Frontier Science of Next Generation Reactive Fluid

    Jun Ishimoto, Kaoru Maruta, Takehiko Sato

    Proceedings of the 12th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration, AFI/TFI-2012, Sendai, Miyagi, Japan, Nov. 19-21　2012/11

  73. Numerical Study of Influence of Initial Standoff Distance on Impulsive Pressure Induced by Single Bubble Collapse near Wall Boundary (Integration to the Next-generation Megasonic Cavitation Cleaning Technology)

    Naoya Ochiai, Yuka Iga, Motohiko Nohmi, Toshiyuki Ikohagi, Jun Ishimoto

    Proceedings of the 12th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration, AFI/TFI-2012, Sendai, Miyagi, Japan, Nov. 19-21　2012/11

  74. Innovative Development of Frontier Multiphase Flow Systems by Reality Coupled Computation

    Jun Ishimoto

    Proceedings of the 12th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration, AFI/TFI-2012, Sendai, Miyagi, Japan, Nov. 19-21　2012/11

  75. Integrated computational study of ultra-high heat flux cooling using cryogenic micro-solid nitrogen spray Peer-reviewed

    Jun Ishimoto, U. Oh, Daisuke Tan

    CRYOGENICS　52　(10)　505-517　2012/10

    DOI： 10.1016/j.cryogenics.2012.07.002 　

    ISSN： 0011-2275

    eISSN： 1879-2235

  76. Supercomputing approach of flotsam mixed tsunami in narrow region Invited

    Jun Ishimoto

    Proceedings of International Innovation Workshop on Off Shore Tsunami Energy Dissipation and Peak Height Alleviation, September 10-12, 2012, Tohoku University　2012/09/10

  77. Acceleration of hydrogen forced ventilation after leakage ceases in a partially open space Peer-reviewed

    Kazuo Matsuura, Masami Nakano, Jun Ishimoto

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　37　(9)　7940-7949　2012/05

    DOI： 10.1016/j.ijhydene.2012.02.034 　

    ISSN： 0360-3199

  78. Innovative Nano-Device Cleaning Technology Using Cryogenic Spray Flow of Micro-Solid Nitrogen

    U Oh, Naoki Harada, Jun Ishimoto

    Technical Congress of Progress and Innovation for Smart Materials and Related Technology (PI-SMART), April 24 2012, Hirosaki, Japan　2012/04

  79. New technology for physical photoresist removal-cleaning method using cryogenic micro-solid nitrogen spray

    Jun Ishimoto

    Annual Workshop of ELyT Laboratory on March 12 - 14, 2012 Presqu’ile de Giens, France　2012/03/14

  80. Thermomechanical Resist Removal-Cleaning System Using Cryogenic Micro-Slush Jet Peer-reviewed

    Jun Ishimoto, Daisuke Tan, Hiroto Ohtake, Seiji Samukawa

    ULTRA CLEAN PROCESSING OF SEMICONDUCTOR SURFACES X　187　145-+　2012

    DOI： 10.4028/www.scientific.net/SSP.187.145 　

    ISSN： 1012-0394

  81. Sensing-based risk mitigation control of hydrogen dispersion and accumulation in a partially open space with low-height openings by forced ventilation Peer-reviewed

    Kazuo Matsuura, Masami Nakano, Jun Ishimoto

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　37　(2)　1972-1984　2012/01

    DOI： 10.1016/j.ijhydene.2011.08.006 　

    ISSN： 0360-3199

  82. Thermomechanical Resist Removal-Cleaning System Using Cryogenic Micro-Slush Jet Peer-reviewed

    Jun Ishimoto, Daisuke Tan, Hiroto Ohtake, Seiji Samukawa

    ULTRA CLEAN PROCESSING OF SEMICONDUCTOR SURFACES X　187　145-+　2012

    DOI： 10.4028/www.scientific.net/SSP.187.145 　

    ISSN： 1012-0394

  83. ULTRA-COOLING HEAT TRANSFER CHARACTERISTICS USING CRYOGENIC MICRO-SOLID NITROGEN SPRAY Peer-reviewed

    U. Oh, Jun Ishimoto, Naoki Harada, Daisuke Tan

    PROCEEDINGS OF THE ASME SUMMER HEAT TRANSFER CONFERENCE, 2012, VOL 2　531-538　2012

  84. Integrated Super Computational Prediction of Liquid Droplet Impingement Erosion Peer-reviewed

    Jun Ishimoto, Shinji Akiba, Kazuhiro Tanji, Kazuo Matsuura

    Progress in Nuclear Science and Technology　2　498-502　2011/12

  85. Integrated Experimental and Numerical Study of Thermomechanical Resist Removal-Cleaning Performance Using Cryogenic Micro-Solid Nitrogen Spray Peer-reviewed

    J. Ishimoto, D. Tan, U. Oh, T. Kubota, S. Samukawa

    SEMICONDUCTOR CLEANING SCIENCE AND TECHNOLOGY 12 (SCST 12)　41　(5)　83-90　2011

    DOI： 10.1149/1.3630830 　

    ISSN： 1938-5862

  86. The sensing-based high-fidelity risk mitigation control of hydrogen dispersion in a partially open space Peer-reviewed

    Kazuo Matsuura, Masami Nakano, Jun Ishimoto

    Proceedings of The ICCE-2010, 10th international conference on clean energy, 15-17 September 2010, Famagusta, North Cyprus [in CD-ROM].　2010/09

  87. Integrated super computational analysis of atomization process of magnetic fluid jet Peer-reviewed

    Jun ISHIMOTO

    Proceedings of The 12th International conference on Magnetic Fluids, Sendai, Japan, August 1 – 5 (2010) [in CD-ROM].　2010/08

  88. Computational Prediction of the Effect of Microcavitation on an Atomization Mechanism in a Gasoline Injector Nozzle Peer-reviewed

    Jun Ishimoto, Fuminori Sato, Gaku Sato

    JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME　132　(8)　082801　2010/08

    DOI： 10.1115/1.4000264 　

    ISSN： 0742-4795

  89. Forced ventilation for sensing-based risk mitigation of leaking hydrogen in a partially open space Peer-reviewed

    Kazuo Matsuura, Masami Nakano, Jun Ishimoto

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　35　(10)　4776-4786　2010/05

    DOI： 10.1016/j.ijhydene.2010.02.068 　

    ISSN： 0360-3199

  90. The sensing-based adaptive risk mitigation of leaking hydrogen in a partially open space Peer-reviewed

    Kazuo Matsuura, Masami Nakano, Jun Ishimoto

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　34　(20)　8770-8782　2009/10

    DOI： 10.1016/j.ijhydene.2009.08.013 　

    ISSN： 0360-3199

  91. Integrated Computation of Micro-Cavitation in Gasoline Injector Atomization Peer-reviewed

    Jun Ishimoto

    Proceedings of the 11th ICLASS International Conference on Liquid Atomization and Spray Systems, Vail, Colorado, Sunday, July 26 Thursday, July 30, 2009　2009/07/30

  92. 液体水素ジェット微粒化プロセスに関する融合数値予測 Peer-reviewed

    石本 淳, 大平 勝秀, 岡林 一木, 千歳 敬子

    低温工学　44　(7)　314-322　2009/07/25

    Publisher:

    DOI： 10.2221/jcsj.44.314 　

    ISSN： 0389-2441

  93. 二流体ノズルによるマイクロスラッシュ粒子生成の融合計算 Peer-reviewed

    石本 淳

    低温工学　44　(2)　68-76　2009/02/25

    Publisher:

    DOI： 10.2221/jcsj.44.68 　

    ISSN： 0389-2441

  94. Development of Micor-Slush Multiphase Fluid Recycle by System Integration

    ISHIMOTO Jun

    The Reference Collection of Annual Meeting　2009　288-289　2009

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/jsmemecjsm.2009.9.0_288 　

    More details Close

    The fundamental characteristics of the atomization behavior of micro-slush nitrogen (SN_2) jet flow through a two-fluid nozzle was numerically investigated and visualized by a new type of integrated simulation technique. CFD analysis is focused on the production mechanism of micro-slush nitrogen particles in a two-fluid nozzle and on the consecutive atomizing spray flow characteristics of the micro-slush jet. Based on the numerically predicted nozzle atomization performance, a new type of superadiabatic two-fluid ejector nozzle is developed.

  95. Numerical study of cryogenic micro-slush particle production using a two-fluid nozzle Peer-reviewed

    Jun Ishimoto

    CRYOGENICS　49　(1)　39-50　2009/01

    DOI： 10.1016/j.cryogenics.2008.10.004 　

    ISSN： 0011-2275

  96. Integrated Parallel Computation of Atomization Process of Liquid Hydrogen Jet

    Jun ISHIMOTO, Daisuke TAN, Toshihiro SUZUKI, Katsuhide OHIRA

    Proceedings of The 8th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration　32-33　2008/12/19

  97. Development of production system of cryogenic micro-slush particles using a two-fluid nozzle Peer-reviewed

    Jun Ishimoto

    International Communications in Heat and Mass Transfer　35　(10)　1235-1240　2008/12

    DOI： 10.1016/j.icheatmasstransfer.2008.07.011 　

    ISSN： 0735-1933

  98. Integrated Parallel Computation of Atomization Process of Liquid Hydrogen Jet

    Jun Ishimoto, Daisuke Tan, Toshihiro Suzuki, Katsuhide Ohira

    Proceedings of the AFI/TFI-2008　1　2008/12

  99. Development of production system of cryogenic micro-slush particles using a two-fluid nozzle Peer-reviewed

    Jun Ishimoto

    INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER　35　(10)　1235-1240　2008/12

    DOI： 10.1016/j.icheatmasstransfer.2008.07.011 　

    ISSN： 0735-1933

  100. Integrated Parallel Computation of Spray Atomization with the Effect of Micro-Cavitation Peer-reviewed

    Jun Ishimoto, Fuminori Sato, Gaku Sato, Kozo Saito

    Proceedings of the 2008 Painting Technology Workshop (PTW2008)　2008/10/06

  101. Integrated Parallel Computation of Spray Atomization with the Effect of Micro-Cavitation Peer-reviewed

    Jun Ishimoto, Fuminori Sato, Gaku Sato, Kozo Saito

    Proceedings of 2008 Painting Technology Workshop (PTW2008)　2008/10/06

  102. Flow Characteristics of Slush Nitrogen in Various Types of Pipes Peer-reviewed

    Masakazu Nozawa, Katsuhide Ohira, Naoto Okazaki, Jun Ishimoto, Koichi Takahashi, Takanobu Kamiya

    Proceedings of 22nd International Cryogenic Engineering Conference　22　255-260　2008/07

  103. Heat Transfer and Pressure Drop Reduction of Slush Nitrogen in a Turbulent Pipe Flow Peer-reviewed

    Katsuhide Ohira, Norifumi Takahashi, Masakazu Nozawa, Jun Ishimoto

    Proceedings of 22nd International Cryogenic Engineering Conference　22　353-358　2008/07

  104. Integrated numerical prediction of atomization process of liquid hydrogen jet Peer-reviewed

    Jun Ishimoto, Katsuhide Ohira, Kazuki Okabayashi, Keiko Chitose

    CRYOGENICS　48　(5-6)　238-247　2008/05

    DOI： 10.1016/j.cryogenics.2008.03.006 　

    ISSN： 0011-2275

  105. The effect of magnetic field on a microgravity single droplet combustion Peer-reviewed

    Jun Ishimoto, Takashi Kudo, Kozo Saito

    HEAT AND MASS TRANSFER　44　(6)　635-640　2008/04

    DOI： 10.1007/s00231-007-0292-1 　

    ISSN： 0947-7411

  106. Pressure drop reduction of slush nitrogen in turbulent pipe flows Peer-reviewed

    K. Ohira, M. Nozawa, J. Ishimoto, N. Koizumi, T. Kamiya

    ADVANCES IN CRYOGENIC ENGINEERING, VOLS 53A AND 53B　985　67-+　2008

    DOI： 10.1063/1.2908657 　

    ISSN： 0094-243X

  107. Beat transfer characteristics of slush nitrogen in turbulent pipe flows Peer-reviewed

    K. Ohira, J. Ishimoto, M. Nozawa, T. Kura, N. Takahashi

    ADVANCES IN CRYOGENIC ENGINEERING, VOLS 53A AND 53B　985　1141-1148　2008

    DOI： 10.1063/1.2908465 　

    ISSN： 0094-243X

  108. 高機能性スラッシュ窒素を用いた極低温二相冷却システム Peer-reviewed

    石本 淳

    流体科学研究所報告　18　(20)　25-36　2007/12/21

    Publisher:

    ISSN： 0916-2860

  109. Stability of the boiling two-phase flow of a magnetic fluid Peer-reviewed

    Jun Ishimoto

    JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME　74　(6)　1187-1196　2007/11

    DOI： 10.1115/1.2723825 　

    ISSN： 0021-8936

  110. 二流体ノズルを用いた極低温マイクロスラッシュ粒子の生成 Peer-reviewed

    石本淳

    低温工学　42　(5)　116-123　2007/05/20

    Publisher: CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

    DOI： 10.2221/jcsj.42.116 　

    ISSN： 0389-2441

    More details Close

    A production method for micro-slush nitrogen particles is investigated using a two-fluid atomization nozzle to apply micro-slush as a refrigerant for long-distance superconducting cables; a process that is expected to result in an extensive improvement in effective cooling performance for superconducting systems. The principle of the micro-slush production nozzle and the performance of the nozzle investigated by Particle Image Velocimetry (PIV) measurement and Computational Fluid Dynamics (CFD) analysis are herein presented. We mainly focus on the development of a new type of two-fluid ejector nozzle, which is capable of generating and atomizing solid nitrogen using liquid-gas impingement of a pressurized subcooled liquid nitrogen (LN2) flow and by a low-temperature, high-speed gaseous helium (GHe) flow. In addition, we constructed a micro-slush particle production system using this new type of two-fluid nozzle and then investigated the effect of the mass flow rate of GHe on the characteristics of the micro-slush two-phase atomizing flow by PIV. Furthermore, the measurement results are compared with those of CFD simulation under the same experimental conditions. The results of this research show that it is possible to produce fine micro-slush nitrogen particles using this newly developed two-fluid nozzle under high-speed atomizing flow conditions, and by applying the appropriate mass-flow rate of subcooled LN2 and cryogenic GHe. Based on the optimized thermal flow conditions of cryogenic micro-slush particulate atomizing two-phase flow and the practical use of its multiphase functionality, utilization in the development of a new type of superconducting cooling system is predicted.

  111. Integrated Simulation of the Atomization Process of Liquid Jet through a Cylindrical Nozzle Peer-reviewed

    Jun ISHIMOTO, Hidehiro HOSHINA, Tadashi TSUCHIYAMA, Hideyuki WATANABE, Asako HAGA, Fuminori SATO

    Interdisciplinary Information Sciences　13　(1)　7-16　2007/03

    DOI： 10.4036/iis.2007.7 　

  112. Reality Coupled Computation of Complex Multiphase Flow Peer-reviewed

    Jun ISHIMOTO

    Proceeding of the 3rd International Conference on Flow Dynamics　81-82　2006/11/07

  113. Integrated CFD Approach of Atomization Process of Lateral Flow in Injector Nozzle Peer-reviewed

    Jun ISHIMOTO, Hidehiro HOSHINA, Tadashi TSUCHIYAMA, Hideyuki WATANABE, Asako HAGA

    Proceedings of the 6th International Symposium on Advanced Fluid Information - JAXA-IFS Joint Symposium - (AFI-2006)　61-62　2006/10/26

  114. Integrated CFD on Atomization Process of Lateral Flow in Injector Nozzle Invited Peer-reviewed

    Jun Ishimoto

    Proceedings of the Second Korea-Japan CFD Workshop　7-8　2006/10/13

  115. Numerical prediction of a two-phase fluid driving system using cavitating flow of magnetic fluid Peer-reviewed

    Jun Ishimoto

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER　49　(21-22)　3866-3878　2006/10

    DOI： 10.1016/j.ijheatmasstransfer.2006.04.023 　

    ISSN： 0017-9310

    eISSN： 1879-2189

  116. Integrated CFD Aproach of the Liquid Atomization Mechanism in an Injector Nozzle Peer-reviewed

    Jun ISHIMOTO, Hidehiro HOSHINA, Tadashi TSUCHIYAMA, Hideyuki WATANABE, Asako HAGA

    Proceedings of the 10th International Conference on Liquid Atomization and Spray Systems (ICLASS-2006)　[in CD-ROM]　2006/08/27

  117. Integrated Simulation of Atomization Process of Lateral Flow in Injector Nozzle Peer-reviewed

    Jun ISHIMOTO, Hidehiro HOSHINA, Tadashi TSUCHIYAMA, Hideyuki WATANABE, Asako HAGA

    Proceedings of The 3rd International Symposium on Transdisciplinary Fluid Integration　43-44　2006/06/12

  118. Numerical Prediction of Two-Phase MHD Power Generation System Using Cavitating Flow of Electrically Conducting Magnetic Fluid Peer-reviewed

    Jun Ishimoto

    Progress in Multiphase Flow Research　I　249-264　2006/04/01

  119. CFD analysis on two-phase pipe flow of slush nitrogen Peer-reviewed

    J. Ishimoto

    Advances in Cryogenic Engineering, Vols 51A and B　823　1017-1024　2006

    DOI： 10.1063/1.2202515 　

    ISSN： 0094-243X

  120. Integrated CFD Approach of the Liquid Atomization Mechanism in a Spray Nozzle

    Jun Ishimoto, Hidehiro Hoshina, Tadashi Tsuchiyama, Hideyuki Watanabe

    Fifth International Symposium on Advanced Fluid Information (AFI-2005) —IFS-JAXA Joint Symposium—, December 8-9, 2005, Institute od Fluid Science, Tohoku University, Sendai, Japan　70-71　2005/12

  121. Hydrodynamic Performance of Two-Phase MHD Power Generation System Using Cavitating Flow of Electrically Conducting Magnetic Fluid

    Jun Ishimoto

    21st Century COE Program, 2nd International Conference on Flow Dynamics, Nov. 16-18, 2005, Sendai , Japan　6-15　2005/11

  122. Numerical and experimental study on the cavitating flow characteristics of pressurized liquid nitrogen in a horizontal rectangular nozzle Peer-reviewed

    J Ishimoto, M Onishi, K Kamijo

    JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME　127　(4)　515-524　2005/11

    DOI： 10.1115/1.1928916 　

    ISSN： 0094-9930

  123. Integrated Simulation of the Liquid Atomization Mechanism through a Nozzle

    Jun Ishimoto, Hidehiro Hoshina, Tadashi Tsuchiyama, Hideyuki Watanabe

    Proc. Second International Symposium on Transdisciplinary Fluid Integration, TFI-2005, October 26-27, 2005, Hotel Hyuga, Hyuga, Miyazaki, JAPAN　43　2005/10

  124. Numerical study of two-phase flow of liquid helium in a vertical converging-diverging nozzle Peer-reviewed

    Jun Ishimoto, Kenjiro Kamijo

    Heat Transfer - Asian Research　34　(6)　432-448　2005/09

    DOI： 10.1002/htj.20071 　

    ISSN： 1099-2871

  125. Numerical analysis of cavitating flow of magnetic fluid in a vertical venturi channel Peer-reviewed

    J Ishimoto, S Kamiyama

    JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING　48　(3)　478-487　2005/08

    DOI： 10.1299/jsmeb.48.478 　

    ISSN： 1340-8054

  126. Numerical study of the two-phase flow characteristics of slush nitrogen Peer-reviewed

    J Ishimoto, R Ono

    CRYOGENICS　45　(4)　304-316　2005/04

    DOI： 10.1016/j.cryogenics.2004.12.001 　

    ISSN： 0011-2275

  127. Numerical study of cavitating flow of magnetic fluid in a vertical converging-diverging nozzle Peer-reviewed

    J Ishimoto, S Kamiyama

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　289　260-263　2005/03

    DOI： 10.1016/j.jmmm.2004.11.074 　

    ISSN： 0304-8853

  128. 325 Integrated Simulation and Visualization on the Liquid Atomization Mechanism

    ISHIMOTO Jun, HOSHINA Hidehiro, TSUCHIYAMA Tadashi, WATANABE Hideyuki

    The proceedings of the JSME annual meeting　2005　19-20　2005

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/jsmemecjo.2005.7.0_19 　

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    The 2-D and 3-D structure of liquid atomization behavior is numerically investigated and vizualized by the new type of integrated simulation technique. The present CFD analysis is focusing on the consecutive breakup of liquid column, formation of liquid film and droplets at the exit section of nozzle outlet. The governing equations for high-speed spray nozzle flow based on the LES-VOF model are presented, and then an integrateed parallel simulation are performed to clarify the detailed atomization process and to clarify the atomized droplets-gas two-phase flow characteristics.

  129. Numerical prediction of cavitating MHD flow of electrically conducting magnetic fluid in a converging-diverging nozzle Peer-reviewed

    J Ishimoto

    JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME　71　(6)　825-838　2004/11

    DOI： 10.1115/1.1794164 　

    ISSN： 0021-8936

  130. スラッシュ窒素の二相流動特性に関する数値解析 Peer-reviewed

    石本淳, 大野隆介

    低温工学　39　(10)　463-474　2004/10

    DOI： 10.2221/jcsj.39.463 　

  131. 微小重力下における単一液滴の消炎現象に関する数値解析 Peer-reviewed

    石本淳, 工藤崇, 伊藤昭彦, Kozo SAITO, Vedha NAYAGAM

    微粒化　13　(41)　148-155　2004/03

    Publisher:

    ISSN： 1341-6022

  132. Numerical study of cavitating flow characteristics of liquid helium in a pipe Peer-reviewed

    J Ishimoto, K Kamijo

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER　47　(1)　149-163　2004/01

    DOI： 10.1016/S0017-9310(03)00386-7 　

    ISSN： 0017-9310

  133. Numerical study of two-phase flow of liquid helium in a vertial converging-diverging nozzle Peer-reviewed

    Jun Ishimoto, Kenjiro Kamijo

    Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B　70　(696)　2134-2141　2004

    Publisher: Japan Society of Mechanical Engineers

    DOI： 10.1299/kikaib.70.2134 　

    ISSN： 0387-5016

  134. Basic study on two-phase flow characteristics of slush nitrogen in a pipe Peer-reviewed

    J Ishimoto, R Ohno, H Yanagi, A Machida, M Ikeuchi, K Hattori, A Ito

    ADVANCES IN CRYOGENIC ENGINEERING, VOLS. 49A AND B　710　1099-1106　2004

    ISSN： 0094-243X

  135. Numerical simulation of cavitating flow of liquid helium in a vertical converging-diverging nozzle Peer-reviewed

    J Ishimoto, K Kamijo

    ADVANCES IN CRYOGENIC ENGINEERING, VOLS. 49A AND B　710　1060-1067　2004

    ISSN： 0094-243X

  136. Cavitating Flow of Liquid Nitrogen in Horizontal Rectangular Nozzle Peer-reviewed

    Jun Ishimoto, Masahiro Onishi, Takashi Tokumasu, Kenjiro Kamijo

    Proceedings of The IMECE'03, 2003 ASME International Mechanical Engineering Congress & Exposition, Washington, D.C., November 16-21　2003/11

  137. Numerical Analysis of Microgravity Methanol Single Droplet Combustion in Homogeneous Flow Peer-reviewed

    Jun Ishimoto, Akihiko Ito, Kozo Saito, Vedha Nayagam

    Proc. 4th International Symposium on Scale Modeling (ISSM-IV), Cleveland USA　241-249　2003/09

  138. Numerical analysis of cavitating flow of liquid helium in a converging-diverging nozzle Peer-reviewed

    J Ishimoto, K Kamijo

    JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME　125　(5)　749-757　2003/09

    DOI： 10.1115/1.1601253 　

    ISSN： 0098-2202

  139. Numerical analysis of cavitating flow of liquid helium in a converging-diverging nozzle Peer-reviewed

    J Ishimoto, K Kamijo

    JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME　125　(5)　749-757　2003/09

    DOI： 10.1115/1.1601253 　

    ISSN： 0098-2202

  140. 水平狭まり－広がり流路内における液体ヘリウムキャビテーション流れの数値解析 Peer-reviewed

    石本淳, 上條謙二郎

    日本航空宇宙学会論文集　51　(592)　228-235　2003/05

    Publisher:

    DOI： 10.2322/jjsass.51.228 　

    ISSN： 1344-6460

  141. Numerical simulation of cavitating flow of liquid helium in venturi channel Peer-reviewed

    J Ishimoto, K Kamijo

    CRYOGENICS　43　(1)　9-17　2003/01

    DOI： 10.1016/S0011-2275(02)00149-2 　

    ISSN： 0011-2275

    eISSN： 1879-2235

  142. Cavitating flow of Magnetic Fluid in Converging-Diverging Nozzle under Nonuniform Magnetic Field Peer-reviewed

    Jun Ishimoto

    Magnetohydrodynamics　38　(3)　2002/11

  143. Basic Study on Direct Mist Cooling of Heated Aluminum Plate for Crack Reduction Peer-reviewed

    Jun Ishimoto, Ryusuke Ohno, Akihiko Ito, Kozo Saito

    Proceedings of the 7th Annual Conference of Liquid Atomization and Spray Systems-Asia, Ilass-Asia,　214-221　2002/11

  144. 液体ヘリウムのベンチュリ流路内キャビテーション流れに関する数値シミュレーショ ン Peer-reviewed

    石本淳, 上條謙二郎

    低温工学　37　(10)　565-572　2002/10

    Publisher:

    DOI： 10.2221/jcsj.37.565 　

    ISSN： 0389-2441

  145. Numerical simulation of cavitating flow of liquid helium in a pipe using multi-fluid model Peer-reviewed

    J Ishimoto, M Oike, K Kamijo

    ADVANCES IN CRYOGENIC ENGINEERING, VOL 47, PTS A AND B　613　1413-1420　2002

    ISSN： 0094-243X

  146. Numerical analysis of two-phase pipe flow of liquid helium using multi-fluid model Peer-reviewed

    J Ishimoto, M Oike, K Kamijo

    JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME　123　(4)　811-818　2001/12

    DOI： 10.1115/1.1400747 　

    ISSN： 0098-2202

  147. Two-Dimensional Numerical Simulation of Cavitating Flow of Superfluid Helium II

    Jun Ishimoto, Mamoru Oike, Kenjiro Kamijo

    Proceedings of the First International Symposium on Advanced Fluid Information, AFI-2001　245-250　2001/11

  148. Two-Dimensional Numerical Simulation of Cavitating Flow of Superfluid Helium II

    Jun Ishimoto, Mamoru Oike, Kenjiro Kamijo

    Proceedings of the First International Symposium on Advanced Fluid Information, AFI-2001　245-250　2001/10/04

  149. Two-dimensional numerical simulation of boiling two-phase flow of liquid nitrogen Peer-reviewed

    J Ishimoto, M Oike, K Kamijo

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES　43　(141)　114-121　2000/11

    DOI： 10.2322/tjsass.43.114 　

    ISSN： 0549-3811

  150. Two-dimensional numerical analysis of boiling two-phase flow of liquid helium Peer-reviewed

    J Ishimoto, M Oike, K Kamijo

    JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING　43　(1)　62-70　2000/02

    DOI： 10.1299/jsmeb.43.62 　

    ISSN： 1340-8054

  151. Numerical Analysis on Boiling Two-Phase Flow of Liquid Helium Peer-reviewed

    Jun Ishimoto, Mamoru Oike, Kenjiro Kamijo

    Proceedings of The 1999 National Heat Transfer Conference, ASME (1999), Albuquerque, New Mexico　1999/08

  152. Numerical Simulation on Boiling Two-Phase Flow of Liquid Helium Peer-reviewed

    Jun Ishimoto, Mamoru Oike, Kenjiro Kamijo

    Proceedings of The 3rd ASME/JSME Joint Fluids Engineering Conference　FED-Vol.248　1999/07

  153. 液体ヘリウムの沸騰二相流に関する二次元数値解析 Peer-reviewed

    石本淳, 尾池守, 上條謙二郎

    日本機械学会論文集 （B編）　65　(630)　482-489　1999/02

    DOI： 10.1299/kikaib.65.482 　

  154. Numerical Simulation on Boiling Two-Phase Flow of Liquid Nitrogen Peer-reviewed

    Jun Ishimoto, Kenjiro Kamijo, Mamoru Oike

    Proceedings of The International Symposium on Computational Technologies for Fluid/Thermal/Structural/Chemical Systems With Industrial Applications　PVP-Vol.377-2　1998/08

  155. 液体窒素の気液二相流動特性に関する数値解析 Peer-reviewed

    石本淳, 尾池守, 上條謙二郎

    日本機械学会論文集 （B編）　64　(622)　1741-1747　1998/06

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/kikaib.64.1741 　

    ISSN： 0387-5016

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    Gas liquid two-phase flow characteristics in a pipe flow of liquid nitrogen are numerically investigated. Firstly, the government equations on two-phase flow of liquid nitrogen based on the unsteady drift-flux model are presented and several characteristics are numerically calculated taking into consideration the effect of cryogenic flow state. It is found that phase change of liquid nitrogen occurs in quite short time interval compared with that of pressurized water in high temperature. Next, it is clarified that the pressure wave in two-phase flow forms strongly steep shape with the time progress because of the nonlinearity based on a compressibility of cryogenic two-phase mixture. According to these theoretical results, it seems reasonable to predict the fundamental characteristics of cryogenic two-phase flow, and the obtained numerical results would contribute to advanced cryogenic engineering applications.

  156. Nonlinear Wave Propagation in Two-Phase Flow of Magnetic Fluid under a Nonuniform Magnetic Field Peer-reviewed

    Jun Ishimoto, Shinichi Kamiyama, Kenjiro Kamijo

    Proceedings of The International Symposium onHydrodynamics of Magnetic Fluids and its Applications　1997/12

    DOI： 10.1016/S0029-5493(97)00165-9 　

  157. Wave propagation in two-phase flow of magnetic fluid under a nonuniform magnetic field Peer-reviewed

    Jun Ishimoto, Shinichi Kamiyama

    Nuclear Engineering and Design　175　(1-2)　87-96　1997/11/01

    Publisher: Elsevier BV

    DOI： 10.1016/S0029-5493(97)00165-9 　

    ISSN： 0029-5493

  158. Wave propagation in two-phase flow of magnetic fluid under a nonuniform magnetic field Peer-reviewed

    J Ishimoto, S Kamiyama

    NUCLEAR ENGINEERING AND DESIGN　175　(1-2)　87-96　1997/11

    DOI： 10.1016/S0029-5493(97)00165-9 　

    ISSN： 0029-5493

  159. Rotating Cavitation in Three and Four-Bladed Inducers Peer-reviewed

    Tomoyuki Hashimoto, Hitoshi Yamada, Shiro Funatsu, Jun Ishimoto, Kenjiro Kamijo, Yoshinobu Tsujimoto

    AIAA Paper, 97-3026, Presented at the 33th AIAA/ASME/SAE /ASEE Joint Propulsion Conference & Exhibit　1997/06

  160. 非一様磁場下における磁性流体中の気泡の挙動に関する数値解析 Peer-reviewed

    石本淳, 神山新一

    日本機械学会論文集（B編）　62　(603)　3777-3783　1996/11

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/kikaib.62.3777 　

    ISSN： 0387-5016

  161. Behavior and Dynamics of Magnetic Fluid as a Multiphase Fluid Peer-reviewed

    Shinichi Kamiyama, Jun Ishimoto

    Proceedings of The Japan - U.S. Seminar on Two-Phase Flow Dynamics　1996/11

  162. 磁性流体沸騰二相流の安定性に関する研究 Peer-reviewed

    石本淳, 大久保雅章, 神山新一

    日本機械学会論文集（B編）　62　(595)　903-912　1996/03

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/kikaib.62.903 　

    ISSN： 0387-5016

  163. Basic study on an energy conversion system using gas-liquid two-phase flows of magnetic fluid - (Analysis on the mechanism of pressure rise) Peer-reviewed

    J Ishimoto, M Okubo, H Nishiyama, S Kamiyama

    JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING　39　(1)　72-79　1996/02

    DOI： 10.1299/jsmeb.39.72 　

    ISSN： 1340-8054

  164. BOILING 2-PHASE FLOWS OF MAGNETIC FLUID IN A NONUNIFORM MAGNETIC-FIELD Invited Peer-reviewed

    S KAMIYAMA, J ISHIMOTO

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　149　(1-2)　125-131　1995/08

    DOI： 10.1016/0304-8853(95)00354-1 　

    ISSN： 0304-8853

  165. BUBBLE BEHAVIOR IN MAGNETIC FLUID UNDER A NONUNIFORM MAGNETIC-FIELD Peer-reviewed

    J ISHIMOTO, M OKUBO, S KAMIYAMA, M HIGASHITANI

    JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING　38　(3)　382-387　1995/08

    DOI： 10.1299/jsmeb.38.382 　

    ISSN： 0914-8817

  166. Visualization Analysis on the Boiling Two-Phase Flow Characteristics of Magnetic Fluid in a Nonuniform Magnetic Field Peer-reviewed

    Jun Ishimoto, Masaaki Okubo, Shinichi Kamiyama

    Proceedings of The Symposium on Flow Visualization and Image Processing of Multiphase Systems, ASME/JSME Fluids Engineering Division Meeting　FED-Vol.209　179-186　1995/08

  167. 7.Influence of Magnetic Field on the Bubble Size in the Boiling Magnetic Fluids Peer-reviewed

    Krakov, Mikhail, Shinichi Kamiyama, Jun Ishimoto

    Proceedings of the 14th International Riga Conference on Magnetohydrodynamics, MAHYD 95　1995/08

  168. Effect of Magnetic Field on the Stability of Boiling Two-Phase Flows of Magnetic Fluid, Peer-reviewed

    Jun Ishimoto, Masaaki Okubo, Shinichi Kamiyama

    Proceedings of the 2nd International Conference on Multiphase Flow　4　FC17-FC24　1995/04

  169. 感温磁性流体沸騰二相流エネルギー変換システムに関する基礎研究 （熱非平衡モデルによる理論解析と超音波エコーを用いた流れの可視化計測） Peer-reviewed

    石本淳, 大久保雅章, 神山新一

    日本機械学会論文集（B編）　61　(581)　157-165　1995/01

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/kikaib.61.157 　

    ISSN： 0387-5016

    More details Close

    Effects of magnetic field on the characteristics of boiling two-phase pipe flow of temperature-sensitive magnetic fluid are clarified in detail both theoretically and experimentally. Firstly, governing equations of two-phase magnetic fluid flow based on the thermal nonequilibrium two-fluid model are presented and numerically solved considering evaporation and condensation between gas- and liquid-phases. Next, behaviour of vapor bubbles is visualized with ultrasonic echo in the region of nonuniform magnetic field. This is recorded and processed with an image processor. As a result, the distributions of void fraction in the two-phase flow are obtained. Furthermore, detailed characteristics of the two-phase magnetic fluid flow are investigated using a small test loop of the new energy conversion system. From the numerical and experimental results, it is known that the precise control of the boiling two-phase flow and bubble generation is possible by using the nonuniform magnetic field effectively. These fundamental studies on the characteristics of two-phase magnetic fluid flow will contribute to the development of the new energy conversion system using a gas-liquid boiling two-phase flow of magnetic fluid.

  170. Basic Study on an Energy Conversion System Using Gas-Liquid Two-Phase Flows of Magnetic Fluid Peer-reviewed

    Masaaki Okubo, Jun Ishimoto, Hideya Nishiyama, Shinichi Kamiyama

    Proceedings of the ASME Fluids Engineering Division Summer Meeting　194　105-110　1994/06

  171. Basic Study on an Energy Conversion System Using Gas-Liquid Two-Phase Flow of Magnetic Fluid Peer-reviewed

    Masaaki Okubo, Jun Ishimoto, Shinichi Kamiyama, Hiroyuki Yamasaki

    Proceedings of the 16th Symposium on Efficient Use of Energy and Direct Electrical Power Generation　1994/06

  172. A Basic Study on an Energy Conversion System Using a Gas-Liquid Two-Phase Magnetic Fluid Flow in a Nonuniform Magnetic Field Peer-reviewed

    Jun Ishimoto, Masaaki Okubo, Hideya Nishiyama, Shinichi Kamiyama

    Proceedings of the International ISEM Symposium on Simulation and Design of Applied Electromagnetic Systems　461-464　1994/05

  173. Bubble Behavior in a Magnetic Fluid under a Nonuniform Magnetic Field Peer-reviewed

    Shinichi Kamiyama, Jun Ishimoto, Masaaki Okubo, Masaru Higashitani

    Proceedings of The Second International Symposium on Cavitation　305-310　1994/04

  174. Flow Visualization Measurement on Boiling Two-phase Flows of Magnetic Fluid Using Ultra Sonic Wave Echo

    ISHIMOTO Jun, OKUBO Masaaki, KAMIYAMA Shinichi

    Journal of the Visualization Society of Japan　14　(2)　197-200　1994

    Publisher: 社団法人 可視化情報学会

    DOI： 10.3154/jvs.14.Supplement2_197 　

    ISSN： 0916-4731

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    The flow visualization and the image processing of boiling two-phase pipe flow of magnetic fluid under nonuniform magnetic field are conducted with the ultrasonic wave echo technique. From this visualization measurement, it is clarified that the distributions of void fraction and the bubble generation are strongly influenced by the magnetic field. Next, the stabilization of the two-phase flow is experimentally examined using the image processing technique, and the experimental results are qualitatively agreement with theoretical results. These fundamental studies on the flow visualization measurement indicate that the precise control and stabilization of the two-phase flow are possible by using the magnetic force of the fluid effectively.

  175. Analytical Study on Two-Phase MHD Flow of Electrically Conducting Magnetic Fluid Peer-reviewed

    Masaaki Okubo, Jun Ishimoto, Hideya Nishiyama, Shinichi Kamiyama

    Magnetohydrodynamics　29　(3)　291-297　1994/01

  176. Study of the MHD Power-Generation System Using Two-phase Flows of Temperature-Sensitive Electrically Conducting Magnetic Fluids (Analysis of Flow Characteristics in a Pipe and the Power-Generation Characteristics) Peer-reviewed

    Jun Ishimoto, Masaaki Okubo, Shinichi Kamiyama

    Transactions of the Japan Society of Mechanical Engineers Series B　60　(571)　891-898　1994

    DOI： 10.1299/kikaib.60.891 　

    ISSN： 0387-5016

  177. 磁性流体気液二相流を用いたエネルギー変換システムに関する基礎研究 （圧力上昇効果に関する検討） Peer-reviewed

    石本淳, 大久保雅章, 西山秀哉, 神山新一

    日本機械学会論文集（B編）　59　(566)　3071-3077　1993/10

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/kikaib.59.3071 　

    ISSN： 0387-5016

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    The mechanism of the pressure rise in a gas-liquid two-phase pipe flow of magnetic fluid in a nonuniform magnetic field is investigated in detail both theoretically and experimentally. Firstly, governing equations of one-dimensional gas-liquid two-phase magnetic fluid flow are presented and numerically solved. Next, the pressure distribution in a nonuniform magnetic field region is measured in the cases of two-phase flow, single-phase flow and the stationary state using a new experimental apparatus for the flow system. From the numerical and measurement results, the magnitude of the pressure components which contribute to the total driving force is accurately estimated. These results on the pressure distribution will contribute to the development of a new energy conversion system using gas-liquid two-phase magnetic fluid flows.

  178. 磁性流体気液二相流の管内圧力分布に関する基礎研究

    石本淳, 大久保雅章, 西山秀哉, 神山新一

    磁性流体連合講演会講演論文集　49-51　1992/12

  179. 磁性流体沸騰二相流を用いたエネルギー交換システムに関する基礎研究

    石本淳, 大久保雅章, 西山秀哉, 神山新一

    混相流シンポジウム　25-28　1992/07

  180. 磁性流体気液二相流を用いたエネルギー変換システムに関する基礎研究

    石本淳, 大久保雅章, 西山秀哉, 神山新一

    第4回電磁力関連のダイナミックスシンポジウム講演論文集　305-308　1992/06

  181. 磁性流体気液二相流における気泡運動の画像解析

    大久保雅章, 石本淳, 西山秀哉, 神山新一

    磁性流体連合講演会講演論文集　31-33　1991/12

  182. 導電性磁性流体の沸騰二相流に関する理論解析

    石本淳, 大久保雅章, 西山秀哉, 神山新一

    磁性流体連合講演会講演論文集　25-27　1991/12

  183. Analytical Study on Two-Phase MHD Flow of Electrically Conducting Magnetic Fluid Peer-reviewed

    Masaaki Okubo, Jun Ishimoto, Hideya Nishiyama, Shinichi Kamiyama

    Proceedings of The International Conference on Energy Transfer in Magnetohydrodymamic Flows　323-328　1991/09

  184. 磁性流体沸騰二相流に関する研究

    伊豆浩樹, 長倉良樹, 大久保雅章, 西山秀哉, 神山新一, 石本淳

    第3回電磁力関連のダイナミックスシンポジウム　387-392　1991/06

Show all ︎Show first 5

Misc. 38

  1. 流体潤滑における摺動部摩耗・焼付き発生部位に関するシミュレーション予測法の開発（弾性流体潤滑における混相流体－構造体連成解析の新展開） Invited

    石本淳

    クリーンエネルギー　32　(2)　28-38　2023/02/10

  2. 津波・洪水等による自然災害ダメージ軽減に対する混相流体力学的アプローチ Invited

    石本 淳

    日本流体力学会誌「ながれ」　41　(3)　198-205　2022/06

  3. 統合型水素エネルギ－システムの新展開（カーボンニュートラル社会の新しい形） Invited

    石本 淳

    クリーンエネルギー　31　(5)　52-57　2022/05/10

  4. 0901 Development of snow property model using particle method and its application to snow behavior in snowblower

    YAMAMOTO Yosuke

    Fluids engineering conference ...　2015　"0901-1"-"0901-2"　2015/11/07

    Publisher: The Japan Society of Mechanical Engineers

    ISSN： 1348-0251

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    Snow properties are influenced by climate or region. For the efficient development of a snowblower, stable and quantitative performance evaluation method is required. In this study, we developed snow property model and tried to reproduce the snow removal work using Discrete Element Method (DEM). We developed snow compaction model and air drag model to consider the properties of actual snow. And we have improved the snow property model for fallen snow simulation. The obtained computational results were compared with the experimental results, and found that both results exhibit reasonable agreements. Therefore, we have succeeded in the computational reproduction of quantitative snow behavior in a snowblower using new snow property model.

  5. 0906 Numerical Simulation of Multiple Bubble Behaviors near Wall Boundary in Megasonic Field

    OCHIAI Naoya, ISHIMOTO Jun

    Fluids engineering conference ...　2015　"0906-1"-"0906-2"　2015/11/07

    Publisher: The Japan Society of Mechanical Engineers

    ISSN： 1348-0251

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    Megasonic cleaning, which uses higher frequency wave at and above 1 MHz, have been studies for efficient cleaning without pattern damage in semiconductor industry. To clarify multi bubble dynamics in megasonic field, in the present study, numerical simulations of two and three oscillating bubble near wall boundary in megasonic field are performed using a compressible locally homogeneous model of a gas-liquid two-phase model. In the calculation of two bubbles with the initial radii of 2.0 μm, the oscillating amplitudes of the bubbles grow, the bubbles approach, coalesce, and induce the higher pressure. It is found that in the cases of two bubbles, the induced pressures in the case of R_0 ≥ 2.2 μm are smaller than these in the case of single bubble and these in the case of R_0 ≤ 2:0 μm are larger than these in the case of single bubble.

  6. 機械工学年鑑，7. 流体工学

    西山秀哉, 福西祐, 伊澤精一郎, 浅井圭介, 澤田恵介, 孫明宇, 祖山均, 石本淳, 山本悟, 伊賀由佳, 須藤誠一, 中野政身, 佐藤岳彦, 高奈秀匡, 徳増崇, 米村茂, 早瀬敏幸, 石川拓司

    日本機械学会誌　118　(1161)　27-33　2015/08/05

    Publisher: 日本機械学会

  7. 高応答性流体の異分野融合展開

    石本淳, 西山秀哉, 高奈秀匡, 徳増崇, 寒川誠二, 久保田智広, SAITO Kozo, 姫野武洋, 新城淳史, 岡村崇弘, 松浦一雄, 井上元

    東北大学流体科学研究所共同利用・共同研究拠点流体科学研究拠点活動報告書　2013　2014

  8. 高応答性流体の異分野融合展開

    石本淳, 西山秀哉, 高奈秀匡, 徳増崇, 寒川誠二, 久保田智広, SAITO Kozo, 姫野武洋, 新城淳史, 岡村崇弘, 松浦一雄, 井上元

    東北大学流体科学研究所共同利用・共同研究拠点流体科学研究拠点活動報告書　2012　2013

  9. 高応答性流体の異分野融合展開

    石本淳, 西山秀哉, 高奈秀匡, 徳増崇, 寒川誠二, 久保田智広, SAITO Kozo, 姫野武洋, 新城淳史, 岡村崇弘, 松浦一雄, 井上元

    東北大学流体科学研究所共同利用・共同研究拠点流体科学研究拠点活動報告書　2011　2012

  10. 機能性流体のマルチスケール流動とシステム化

    西山秀哉, 中野政身, 大平勝秀, 山口博司, 澤田達雄, 石本淳, 川野聡恭ほか

    機能性流体のマルチスケール流動とシステム化に関する研究分科会成果報告書　1-135　2010/12

    Publisher: 日本混相流学会

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    2007.9～2010.7研究分科会 R&P Committee 6

  11. 0138 Sensing-based risk mitigation control of hydrogen jet leakage in a partially open space

    Matsuura Kazuo, Nakano Masami, Ishimoto Jun

    Fluids engineering conference ...　2010　81-82　2010/10/29

    Publisher: The Japan Society of Mechanical Engineers

    ISSN： 1348-2882

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    This paper treats the real-time sensing-based risk-mitigation control of hydrogen jet leakage in a partially open space with low openings by forced ventilation. After describing the computational geometry and scenarios, and the mathematical model and numerical procedure, we propose a partially open space that is robust to external environment. Related to this model, a risk-mitigation control algorithm to change the exhaust volume rate based on the least-square method for hydrogen sensor signals is proposed considering the results of applying various exhaust volume rates to the dispersion fields. The proposed method is validated against representative cases.

  12. 0511 Development of ultra-high heat flux cooling and ashing-less wafer cooling system using micro-solid spray

    Ishimoto Jun, Tan Daisuke

    Fluids engineering conference ...　2010　179-180　2010/10/29

    Publisher: The Japan Society of Mechanical Engineers

    ISSN： 1348-2882

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    The ultra-high heat flux characteristics and rapid cooling effect of the micro-solid nitrogen (SN_2) spray flow through a two-fluid nozzle to the heated plate was numerically investigated and measured by a new type of integrated simulation technique. Furthermore, PIA mesurement has been applied to clarify the solid-particle diameter profiles of the micro-solid spray, and the wafer resist removal characteristics by thermo-mechanical effect was investigated. Based on the integrated numerical and experimental study, a new type of ultra-high heat flux cryogenic cooling system and the thermomechanical resist removal-cleaning system using cryogenic micro-solid spray was developed.

  13. Integrated CFD-PIA shadow Measurement of Cryogenic Micro-Slush Atomizing Flow

    ISHIMOTO Jun, TAN Daisuke

    29　(2)　289-290　2009/10/15

    ISSN： 0916-4731

  14. Integrated Visualization of Atomization Process of Injector Nozzle with Micro-Cavitation

    ISHIMOTO Jun, SATO Fuminori, SATO Gaku

    28　(1)　431-432　2008/07/01

    ISSN： 0916-4731

  15. Pressure drop reduction and heat transfer characteristics of slush nitrogen in pipe flows

    OHIRA Katsuhide, TAKAHASHI Norifumi, ISHIMOTO Jun, NOZAWA Masakazu, TAKAHASHI Koichi

    78　59-59　2008/05/26

    ISSN： 0919-5998

  16. Integrated CFD of Atomization Process of Gasoline Injector Nozzle with Micro-Cavitation

    ISHIMOTO Jun, SATO Fuminori, SATO Gaku

    16　210-213　2007/12/19

    ISSN： 1341-6030

  17. Numerical Study of Slush Nitrogen Pipe Flow Characteristics

    MUKAI Yasuaki, OHIRA Katuhide, ISHIMOTO Jun, NOZAWA Masakazu, MAEMURA Takashi, KAMIYA Takanobu

    77　284-284　2007/11/20

    ISSN： 0919-5998

  18. Pressure Drop Characteristic and Solid Particle Behavior in Slush Nitrogen Pipe Flow

    NOZAWA Masakazu, OHIRA Katsuhide, ISHIMOTO Jun, OKAZAKI Naoto, TAKAHASHI Koichi, KAMIYA Takanobu

    77　283-283　2007/11/20

    ISSN： 0919-5998

  19. Heat Transfer Characteristics of Slush Nitrogen in Horizontal Straight Pipe

    TAKAHASHI Norifumi, KUMAGAI Noriaki, OHIRA Katsuhide, ISHIMOTO Jun, NOZAWA Masakazu

    77　285-285　2007/11/20

    ISSN： 0919-5998

  20. Basic study of heat transfer and flow characteristics for practical applications of slush hydrogen

    OHIRA Katsuhide, ISHIMOTO Jun, NOZAWA Masakazu

    77　287-287　2007/11/20

    ISSN： 0919-5998

  21. 7・3・4 機能性混相流体(7・3 機能性流体, 7.流体工学,<特集>創立110周年記念機械工学年鑑)

    石本 淳

    日本機械学會誌　110　(1065)　593-593　2007/08/05

    Publisher: 一般社団法人日本機械学会

    ISSN： 0021-4728

  22. Modeling and Simulation : Modeling-II

    ISHIMOTO Jun

    15　(52)　129-129　2007/01/31

    ISSN： 1341-6022

  23. Report of 10th Organized Multiphase Flow Forum (OMF2006-Sendai)

    ISHIMOTO Jun

    Japanese journal of multiphase flow　20　(4)　367-369　2006/12/15

    Publisher: 日本混相流学会

    ISSN： 0914-2843

  24. Pressure drop reduction characteristics for cryogenic slush nitrogen pipe flow

    OHIRA Katsuhide, KOIZUMI Noriyasu, NIIYAMA Kazuki, KURA Toshio, ISHIMOTO Jun, KAMIYA Takanobu

    75　167-167　2006/11/15

    ISSN： 0919-5998

  25. 1301 Integrated Simulation on the Liquid Atomization in Gasoline Injector(2)

    ISHIMOTO Jun, HOSHINA Hidehiro, WATANABE Hideyuki, HAGA Asako

    Fluids engineering conference ...　2006　"1301-1"-"1301-4"　2006/10/28

    Publisher: The Japan Society of Mechanical Engineers

    ISSN： 1348-2882

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    The governing equations for high-speed lateral atomizing injector nozzle flow based on the LES-VOF model in conjunction with the CSF model are presented, and then an integrated parallel computation are performed to clarify the detailed atomization process of a high speed nozzle flow and to acquire data which is difficult to confirm by experiment such as atomization length, liquid core shapes, droplets size distributions, spray angle and droplets velocity profiles. According to the present analysis, it is found that the atomization rate and the droplets-gas two-phase flow characteristics are controlled by the turbulence perturbation upstream of the injector nozzle, hydrodynamic instabilities at the gas-liquid interface, shear stresses between liquid core and periphery of the jet. Furthermore, stable and a high-resolution computation can be attained in the high density ratio (ρ_l/ρ_g=554) conditions conditions by using our numerical method.

  26. 1301 Integrated Simulation on the Liquid Atomization in Gasoline Injector(1)

    ISHIMOTO Jun, HOSHINA Hidehiro, WATANABE Hideyuki, HAGA Asako

    Fluids engineering conference ...　2006　"1301-a"　2006/10/28

    Publisher: The Japan Society of Mechanical Engineers

    ISSN： 1348-2882

  27. Development of a flow characteristic test system for cryogenic slush fluid

    OHIRA Katsuhide, NIIYAMA Kazuki, KOIZUMI Noriyasu, KURA Toshio, ISHIMOTO Jun, KAMIYA Takanobu

    74　124-124　2006/05/15

    ISSN： 0919-5998

  28. Numerical Analysis on Mist Cooling System of Aluminum Ingot for Crack Reduction : Numerical Prediction on Cooling Characteristics of the Water Mist Flow Impinging to Heated Aluminum Plate

    ISHIMOTO Jun, ITO Akihiko, SAITO Kozo

    11　158-163　2002/12/19

    ISSN： 1341-6030

  29. Numerical Analysis on Mist Cooling System of Aluminum Ingot for Crack Reduction : Numerical Prediction on Cooling Characteristics of the Water Mist Flow Impinging to Heated Aluminum Plate

    OHNO Ryusuke, ISHIMOTO Jun, ITO Akihiko, SAITO Kozo

    11　152-157　2002/12/19

    ISSN： 1341-6030

  30. Numerical Simulation of Cavitating Flow of Superfluid Helium

    ISHIMOTO Jun, OIKE Mamoru, KAMIJO Kenjiro

    65　162-162　2001/11/23

    ISSN： 0919-5998

  31. 812 Numerical Analysis of Cavitating Flow of Superfluid Helium II

    Ishimoto Jun, Oike Mamoru, Kamijo Kenjiro

    Fluids engineering conference ...　2001　111-111　2001/09/28

    Publisher: The Japan Society of Mechanical Engineers

    ISSN： 1348-2882

  32. Effect of Magnetic Field on the Stability of Boiling Two-Phase Flows of Magnetic Fluid

    ISHIMOTO J.

    Proc. 2nd Int. Conf. Multiphase Flow, 2001　4　FC17-FC24　2001

  33. Numerical Analysis of Cavitating Flow of Liquid Helium Using Multi-Fluid Model

    Ishimoto Jun, Oike Mamoru, Kamijo Kenjiro

    2001　571-572　2001

    Publisher: 日本流体力学会

    ISSN： 1342-8004

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    The two-dimensional characteristics of the vapor-liquid cavitating flow of liquid helium in a pipe are numerically investigated to realize the further development and high performance of new cryogenic engineering applications. First, the governing equations of the two-phase flow of liquid helium based on the unsteady thermal nonequilibrium multi-fluid model are presented and several flow characteristics are numerically calculated, taking into account the effect of superfluidity. Based on the numerical results, the two-dimensional structure of the cavitating flow of liquid helium is shown in detail, and it is also found that the phase transition of the normal fluid to the superfluid and the generation of superfluid counterflow against normal fluid flow are conspicuous in the large gas phase volume fraction region where the liquid to gas phase change actively occurs.

  34. 116 Study on a Gas-Liquid Two-Phase Flow of Liquid Nitrogen in a Pipe

    Yamamori Shinya, Ishimoto Jun, Oike Mamoru, Kamijyo Kenjiro

    2000　(35)　34-35　2000/03/11

    Publisher: The Japan Society of Mechanical Engineers

  35. Numerical Analysis on Boiling Multiphase Flow of Superfluid Helium

    ISHIMOTO Jun, OIKE Mamoru, KAMIJO Kenjiro

    61　42-42　1999/11/10

    ISSN： 0919-5998

  36. 液体ヘリウム沸騰二相流の数値シミュレーション (「スーパーコンピューティングと計算流体科学」SCFS '98)

    石本 淳, 尾池 守, 上條 謙二郎

    流体科学シンポジウム講演論文集　1998　67-72　1998/09

    Publisher: 東北大学流体科学研究所

    ISSN： 1344-2236

  37. Report of the First Organized Multiphase Flow Forum : Numerical Analysis of Multiphase Flow

    ISHIMOTO Jun

    12　(1)　92-93　1998/03/15

    ISSN： 0914-2843

  38. Bubble Behavior in Magnetic Fluid under a Nonuniform Magnetic Field

    ISHIMOTO Jun, OKUBO Masaaki, KAMIYAMA Shinichi, HIGASHITANI Masaru

    JSME international journal. Ser. B, Fluids and thermal engineering　38　(3)　382-387　1995/08/15

    Publisher: The Japan Society of Mechanical Engineers

    ISSN： 1340-8054

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    Experimental study is made to clarify the effects of nonuniform magnetic field on bubble behavior in a magnetic fluid. The behavior of vapor bubbles is visualized with ultrasonic wave echo under the nonuniform magnetic field. It is found that the void fraction in two-phase flow decreases with increase in the magnetic field due to the effect of magnetic body force. Furthermore, the effects of nonuniform magnetic field on translational motion and deformation of a single gas bubble in a magnetic fluid are experimentally examined using a transparent thin duct, called a Hele-Shaw cell. The experimental results indicate that a single bubble is decelerated in the region of positive magnetic field gradient and accelerated in the region of negative magnetic field gradient, and that it is elongated in the direction of the magnetic field.

Show all ︎Show first 5

Books and Other Publications 2

  1. Hydrogen production and its transportation, storage, and utilization technology

    2022/09

    ISBN: 9784861048999

  2. Nano-Mega Scale Flow Dynamics in Complex Systems (Edited by S. Maruyama and H. Nishiyama), The 21st Century COE Program International COE of Flow Dynamics Lecture Series

    Hideya Nishiyama, Michio Tokuyama, Takehiko Sato, Toshiaki Ikohagi, Yasuaki Kohama, Jun Ishimoto

    Tohoku University Press.　2007/11

    ISBN: 9784861630811

Presentations 79

  1. Elucidation of Elastohydrodynamic Lubrication with Phase Change Phenomena by Multiphase Fluid-Structure Coupled Computing Invited

    2024/09/05

  2. Multiphase Flow Approach for Biological Thermodynamics and Carbon-Neutral Energy Sciences Invited

    Jun Ishimoto

    The 21st International Conference on Flow Dynamics (ICFD2024) OS8:A dvanced Physical Stimuli and Biological Responses　2024/11/19

  3. 加熱する2次元ノズル壁面近傍における気泡生成の可視化

    大島逸平, 川原田光典, 石本 淳

    日本混相流学会 混相流シンポジウム2024（富山大学五福キャンパス（富山市五福3190））　2024/09/05

  4. クロスフロー型マイクロ水車の混相流動特性に関する数値解析

    金田太樹, 石本 淳

    日本混相流学会 混相流シンポジウム2024（富山大学五福キャンパス（富山市五福3190））　2024/09/05

  5. 液体アンモニアの相変化・拡散現象に関する混相流体解析

    印宮 惇, 石本 淳

    日本混相流学会 混相流シンポジウム2024（富山大学五福キャンパス（富山市五福3190））　2024/09/05

  6. Computational Study for Atomization and Spray Behavior of Liquid Ammonia with Phase Change

    Jun Ishimoto

    Core-to-Core Joint Workshop Between KAUST & Tohoku University IFS　2024/02/02

  7. マイクロ溝部における溶融ろう材の表面張力流れに関する数値解析

    大槻拓史, ケーヒン・サーマル・テクノロジー, 小笠原直樹, ケーヒン, サーマル・テクノロジー, 石本淳(東北大, 仲野是克

    混相流シンポジウム2020 オーガナイズドセッション（OS-5マルチスケール混相流と異分野融合科学）　2020/08/21

  8. Coupled computing of cryogenic fine solid particle production and its impingement with deformable behavior International-presentation

    Nobuhiro Asanuma (GSIS, Tohoku University, Jun Ishimoto (IFS, Tohoku University, Naoya Ochiai (IFS, Tohoku Universi

    ELyT Workshop 2019, On-Campus Workshop　2019/03/09

  9. Advanced computational study for high-pressure spray and atomization phenomena

    ISHIMOTO Jun

    Australia-Japan Fluid Dynamics Workshop　2019/01/31

  10. 極低温ファイン固体窒素粒子生成と基板衝突変形挙動に関する連成解析

    浅沼 伸寛, 石本 淳, 落合 直哉

    第32回数値流体力学シンポジウム　2018/12/11

  11. Coupled FSI computing for resilient energy systems and disaster science International-presentation

    ISHIMOTO Jun

    2nd Workshop Lyon Center (Organized with ELyT Global and ELyTMaX, with INSA Lyon and IFS, Tohoku University) November 20th, 2018, Ecole Centrale de Lyon, France　2018/11/20

  12. LES-VOF法によるダイカストの射出時微粒化現象のシミュレーションシステムの開発

    小屋栄太郎, 中川昌彦, 北川真也, 究所, 石本淳, 仲野是克, 落合直哉

    日本鋳造工学会 第172 回全国講演大会　2018/10/13

  13. ダイカスト射出時の微粒化現象の撮影

    小屋栄太郎, 中川昌彦, 北川真也, 究所, 石本淳, 仲野是克, 落合直哉

    日本鋳造工学会 第172 回全国講演大会　2018/10/13

  14. 極低温微細固体粒子噴霧流動特性の解明とNon-aqueous ウエハ洗浄への応用 Invited

    石本 淳

    混相流シンポジウム2018 オーガナイズドセッション（OS-4混相噴流・後流・はく離流れの流動と制御）　2018/08/10

  15. メガソニック場中の気泡振動による粒子除去の流体構造連成数値解析

    落合直哉, 石本淳

    混相流シンポジウム2018 オーガナイズドセッション（OS-5マルチスケール混相流と異分野融合科学）　2018/08/08

  16. 砂塵を含む混相竜巻の旋回流動特性に関する研究

    平田憲真, 石本淳, 東, 落合直哉

    混相流シンポジウム2018 オーガナイズドセッション（OS-5マルチスケール混相流と異分野融合科学）　2018/08/08

  17. 高圧容器のき裂伝ぱを伴う水素漏えい現象に関する連成解析

    嶋田悟, 石本淳, 東, 落合直哉, Alain Combescure(INSA

    混相流シンポジウム2018 オーガナイズドセッション（OS-5マルチスケール混相流と異分野融合科学）　2018/08/08

  18. Numerical research of solidification dynamics with anisotropy and thermal fluctuations International-presentation

    Przemysław Smakulski, Jun Ishimoto, Sławomir Pietrowicz

    XI-th International Conference on Computational Heat, Mass and Momentum Transfer (ICCHMT 2018), May 21st– 24th, Galaxy Hotel, Kraków, Ploland.　2018/05/21

  19. Coupled particle and Euler method for leaked hydrogen-air mixing with crack propagation of pressure vessel International-presentation

    Jun Ishimoto, Toshinori Sato, Alain Combescure

    8th European-Japanese Two-Phase Flow Group Meeting, The Watson Hotel in Manhattan, 22nd – 26th, April, 2018, New York, USA.　2018/04/22

  20. 高密度水素貯蔵に関する安全性シミュレーション

    低温工学・超伝導学会 第5回冷凍部会（公開）例会／環境・安全委員会，2014年12月17日，（川崎重工業 新東京本社，港区）　2014/12/17

  21. Supercomputing of tsunami damage mitigation by offshore mega floating structures International-presentation

    International Innovation Workshop on Tsunami, Snow Avalanche and Flash Flood Energy Dissipation, Oct. 20-21, 2014, Chamonix, France　2014/10/21

  22. Development of Thermomechanical Resist Removal-Cleaning Technology using Cryogenic Micro-Solid Nitrogen Spray International-presentation

    11th International Conference on Flow Dynamics (ICFD2014), Oct. 8-10, 2014, Sendai International Center, Sendai, Japan.　2014/10

  23. Dynamic Simulation of Snowblower in Consideration of Snow Characteristic International-presentation

    The SecondProceedings of the International Symposium on Innovative Energy Research III, Multiphase Energy Science and Risk Mitigation　2014/10

  24. Numerical Prediction of Compressible Vapor Flow with LDI Erosion International-presentation

    11th International Conference on Flow Dynamics (ICFD2014), Oct. 8-10, 2014, Sendai International Center, Sendai, Japan.　2014/10

  25. Numerical Study of Flotsam Mixed Tsunami and Tsunami Scale Modeling International-presentation

    11th International Conference on Flow Dynamics (ICFD2014), Oct. 8-10, 2014, Sendai International Center, Sendai, Japan.　2014/10

  26. Researches on a Sensing-based Dynamic Forced Ventilation Control of Leaking Hydrogen International-presentation

    11th International Conference on Flow Dynamics (ICFD2014), Oct. 8-10, 2014, Sendai International Center, Sendai, Japan.　2014/10

  27. 先端産業における混相流動のスーパーコンピューティングと高度化

    日本機械学会 産業界におけるCFD利用の高度化に関する研究分科会，2014年9月26日, (東京理科大学・神楽坂キャンパス, 新宿区)　2014/09/26

  28. 一成分極低温マイクロ・ナノ固体窒素スプレー利用型ナノデバイス洗浄システムの開発

    STARCワークショップ2014，2014年9月3日，新横浜国際ホテル（横浜市）　2014/09/03

  29. 先端混相流に関する融合型スーパーコンピューティング

    第4回DADiSP利用技術研究会，2014年8月1日, (ベルサール九段，千代田区)　2014/08/01

  30. リアルタイムセンシングに基づく漏洩水素の強制ベントにおける上限排出量の動的調節

    混相流学会年会講演会2014 オーガナイズドセッション（OS-6 サステナブル異分野融合型混相流），2014年 7月28 -30日，道民センター「かでる2・7」（札幌市）　2014/07/28

  31. 固相変化を伴うラバルノズル内極低温混相流動と冷却熱伝達特性に関するスーパーコンピューティング

    混相流学会年会講演会2014 オーガナイズドセッション（OS-6 サステナブル異分野融合型混相流），2014年 7月28 -30日，道民センター「かでる2・7」（札幌市）　2014/07/28

  32. 粒子法を用いた雪の特性モデリングと挙動シミュレーション 第2 報

    混相流学会年会講演会2014 オーガナイズドセッション（OS-6 サステナブル異分野融合型混相流），2014年 7月28 -30日，道民センター「かでる2・7」（札幌市）　2014/07/28

  33. Ultra-High Heat Flux Cooling Characteristics of Cryogenic Micro-Solid Nitrogen Particles and Its Application to Semiconductor Wafer Cleaning Technology International-presentation

    25th International Cryogenic Engineering Conference and the International Cryogenic Materials Conference in 2014, ICEC 25–ICMC 2014, July 7-11, 2014, University of Twente, Enschede, The Netherlands.　2014/07

  34. 混相流動のスーパーコンピューティングと先端産業応用

    日立研究所 技術研究会，2014年7月1日（日立研究所機械研究センター，ひたちなか市）　2014/07/01

  35. Multiphase High Density Hydrogen Energy and its Risk Assessment International-presentation

    The 20th World Hydrogen Energy Conference 2014, June 15-20, 2014, Kimdaejung Convention Center,Gwangju Metropolitan City, Korea.　2014/06

  36. Coupled Supercomputing of Fluid and Structure Interaction Caused by Flotsam Mixed Tsunami International-presentation

    1st International Conference on Computational Engineering and Science for Safety and Environmental Problems (COMPSAFE2014), Sendai International Center, 13-16 April 2014 in Sendai, Japan.　2014/04

  37. Multiscale coupled computing of multiphase fluid-structure interaction International-presentation

    2nd Core-to-Core Workshop ”Japan-China Joint Workshop on Bio, Material and Flow Dynamics”　2014/02/27

  38. Multiscale Coupled Supercomputing of Multiphase Fluid-Material Interaction International-presentation

    ELyT Workshop 2014 in Frejus, France, February 19 – 21, 2014　2014/02/20

  39. Multiscale coupled computing of multiphase fluid-structure interaction International-presentation

    2nd Core-to-Core Workshop ”Japan-China Joint Workshop on Bio, Material and Flow Dynamics, Feb. 27, 2014, IFS, Tohoku University, Sendai, Japan　2014/02

  40. Thermomechanical Resist Removal‐Cleaning Technology Using Cryogenic Micro‐Nano Solid Nitrogen Spray International-presentation

    Center for High-rate Nanomanufacturing Fall Seminar Series, November 16th , 2012, College of Engineering, Northeastern University, Boston, USA　2012/11/16

  41. Numerical Prediction of Cavitation Erosion Using a Coupled Analysis of Cavitating Flow Field and Bubbles International-presentation

    12th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration, AFI/TFI-2012, Sendai, Miyagi, Japan, Nov. 19-21　2012/11

  42. Innovative Development of Frontier Multiphase Flow Systems by Reality Coupled Computation International-presentation

    12th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration, AFI/TFI-2012, Sendai, Miyagi, Japan, Nov. 19-21　2012/11

  43. Numerical Study of Influence of Initial Standoff Distance on Impulsive Pressure Induced by Single Bubble Collapse near Wall Boundary (Integration to the Next-generation Megasonic Cavitation Cleaning Technology) International-presentation

    12th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration, AFI/TFI-2012, Sendai, Miyagi, Japan, Nov. 19-21　2012/11

  44. Integrated Research Collaboration for Frontier Science of Next Generation Reactive Fluid International-presentation

    12th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration, AFI/TFI-2012, Sendai, Miyagi, Japan, Nov. 19-21　2012/11

  45. Thermomechanical Nano Device Resist Removal-Cleaning Technology by Using Cryogenic Spray Flow of Solid Nitrogen International-presentation

    12th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration, AFI/TFI-2012, Sendai, Miyagi, Japan, Nov. 19-21　2012/11

  46. Super Computational Study of High-Speed Droplet-Vapor Flow and LDI Erosion International-presentation

    12th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration, AFI/TFI-2012, Sendai, Miyagi, Japan, Nov. 19-21　2012/11

  47. 極低温マイクロ・ナノ固体窒素噴霧を用いたレジストはく離・洗浄特性に関する基礎研究

    第73回応用物理学会学術講演会　2012/09/11

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    シンポジウム 界面ナノ電子化学：産業界と学術界との界面融合へ(界面ナノ電子化学研究会企画) [9/11日 愛媛大学]

  48. Supercomputing approach of flotsam mixed tsunami in narrow region International-presentation

    International Innovation Workshop on Off Shore Tsunami Energy Dissipation and Peak Height Alleviation, September 10-12, 2012, Tohoku University, Sendai, Japan　2012/09/10

  49. 微細固体窒素スプレーを用いたウエハレジストはく離－洗浄特性に関する研究

    日本混相流学会年会講演会2012（東京大学 柏キャンパス)　2012/08

  50. ULTRA-COOLING HEAT TRANSFER CHARACTERISTICS USING CRYOGENIC MICRO-SOLID NITROGEN SPRAY International-presentation

    ASME 2012 Summer Heat Transfer Conference, July 8-12, 2012, Rio Grande, Puerto Rico, USA　2012/07

  51. Innovative Nano-Device Cleaning Technology Using Cryogenic Spray Flow of Micro-Solid Nitrogen International-presentation

    Technical Congress of Progress and Innovation for Smart Materials and Related Technology (PI-SMART), April 24 2012, Hirosaki, Japan　2012/04

  52. New technology for physical photoresist removal-cleaning method using cryogenic micro-solid nitrogen spray International-presentation

    Annual Workshop of ELyT Laboratory on March 12 - 14, 2012 Presqu’ile de Giens, France　2012/03/14

  53. Thermomechanical Resist Removal-Cleaning Technology Using Cryogenic Micro-Solid Nitrogen Spray International-presentation

    第14回韓国洗浄技術協議会（漢陽大学ERICAキャンパス）　2011/11/24

  54. Integrated Experimental and Numerical Study of Thermomechanical Resist Removal-Cleaning Performance Using Cryogenic Micro-Solid Nitrogen Spray International-presentation

    220th ECS Meeting and Electrochemical Energy Summit　2011/10/09

  55. 「OpenFOAMによる混相流体解析手法の新展開」

    異業種交流会 「混相流のための OpenFOAM セミナー」　2011/01/11

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    主催： 日本鉄鋼協会 精錬反応プロセスにおける混相流・多重スケール解析技術の開発研究会 協賛： 日本混相流学会 混相流技術リエゾン専門委員会

  56. 「極低温マイクロ・ナノソリッドスプレー利用型半導体洗浄システムの開発」 次世代技術パビリオンの出展社によるプレゼンテーション International-presentation

    SEMICON 2010　2010/12/01

  57. The Effect of Micro-Cavitation on Interfacial Phenomena and Vortex Structure of Atomizing Flow in Gasoline Injector Nozzle International-presentation

    10th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration, AFI/TFI-2010　2010/11/01

  58. Integrated Super Computational Prediction of Liquid Droplet Impingement Erosion International-presentation

    The Joint International Conference of the 7th Supercomputing in Nuclear Application and the 3rd Monte Carlo (SNA + MC2010)　2010/10/17

  59. Thermomechanical Resist Removal-Cleaning System Using Cryogenic Micro-Slush Jet International-presentation

    The Symposium on Ultra Clean Processing of Semiconductor Surfaces (UCPSS),　2010/09/20

  60. Integrated super computational analysis of atomization process of magnetic fluid jet International-presentation

    The 12th International conference on Magnetic Fluids　2010/08/01

  61. マイクロキャビテーションを伴うガソリンインジェクター乱流噴霧微粒化プロセスに関する融合計算

    東京大学ロケットエンジンモデリングラボラトリー 第3回ワークショップ「微粒化現象解明へのアプローチ」　2009/11/20

  62. 二流体ノズルによるマイクロスラッシュ粒子生成の融合計算

    日本機械学会 2009年度年次大会　2009/09/13

  63. マイクロキャビテーションを伴うインジェクター噴霧微粒化の融合CFD

    石本 淳, 佐藤 史教, ケーヒン, 佐藤 岳

    キャビテーションに関するシンポジウム (第14回)　2009/03/19

  64. 液体水素ピンホール漏洩ジェットの微粒化に関する融合CFD予測

    平成19年度 第3回 電気・水素複合エネルギーシステム研究会　2008/01/11

  65. O-6.マイクロキャビテーションを伴うガソリンインジェクター噴霧微粒化機構に関する融合計算

    第16回微粒化シンポジウム　2007/12/20

  66. Integrated Computation of the Effect of Micro-Cavitation on Atomization Process International-presentation

    AFI/TFI-2007, Commemoration of the 100th Anniversary of Tohoku University　2007/12/14

  67. 液体水素ピンホール漏洩ジェット流の微粒化過程に関する融合数値シミュレーション

    第27回水素エネルギー協会大会　2007/12/06

  68. 噴霧微粒化プロセスにおける各種カスタマイズドソルバーの開発

    CAEソリューションズフェア　2007/11/16

  69. 噴霧微粒化プロセスにおける各種カスタマイズドソルバーの開発

    第2回OpenFOAMワークショップ報告会　2007/07/20

  70. Integrated Numerical Prediction of Atomization Process of Liquid Hydrogen Jet International-presentation

    22nd Space Cryogenics Workshop　2007/07/11

  71. O-1.極低温マイクロスラッシュの噴霧流動特性

    第26回 混相流学会年会講演会2007　2007/06/22

  72. Integrated CFD Planning of Gasoline Injector (Virtual Computational Designing of Injector Nozzle for High Fuel-Efficient Automobile)

    第3回国際産学連携交流会　2006/11/16

  73. Reality Coupled Computation of Complex Multiphase Flow, International-presentation

    3rd International Conference on Flow Dynamics　2006/11/07

  74. 液体微粒化メカニズムに関する一体型シミュレーションと可視化

    第84期 日本機械学会流体工学部門 講演会　2006/10/28

  75. ガソリンインジェクター内微粒化機構に関する一体型融合計算

    第10回オーガナイズド混相流フォーラム (OMF2006-Sendai)　2006/10/16

  76. Integrated CFD on Atomization Process of Lateral Flow in Injector Nozzle International-presentation

    Second Korea-Japan CFD Workshop,　2006/10/13

  77. Integrated CFD Approach of the Liquid Atomization Mechanism in an Injector Nozzle International-presentation

    The 10th International Conference on Liquid Atomization and Spray Systems (ICLASS-2006),　2006/08/27

  78. CFD Analysis on two phase pipe flow of slush nitrogen International-presentation

    2005 Cryogenic Engineering Conference and International Cryogenic Materials Conference (CEC-ICMC 2005)　2005/08/29

  79. Computational study of liquid ammonia atomization and spray characteristics in an injector nozzle

    Jun Ishimoto

    International workshop on science and technology supporting energy conversion towards carbon neutrality, University of Orléans (France)　2024/07/03

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Industrial Property Rights 5

  1. 凍結装置、凍結方法

    石本 淳

    Property Type: Patent

  2. 一成分極低温微細固体粒子連続生成装置、および、その一成分極低温微細固体粒子連続生成方法

    石本 淳

    特許第6153110号

    Property Type: Patent

  3. 換気システムおよび換気制御法

    松浦一雄, 中野政身, 石本淳

    5494169

    Property Type: Patent

  4. 極低温マイクロスラッシュ超高熱流束冷却システム

    石本 淳

    5419000

    Property Type: Patent

  5. 極低温マイクロスラッシュ生成システム

    石本 淳

    特許4961551

    Property Type: Patent

Research Projects 23

  1. Supercomputing and Scale Modeling the Effect of Flotsam mixed Tsunami: Implication to Tsunami generated by The 2011 Great East Coast Earthquake Competitive

    System: The Other Research Programs

    2013/01 - Present

  2. A Coupled Scientific Approach to Peer-to-Peer Multiphase Hydrogen Energy Systems

    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: Tohoku University

    2023/04/01 - 2026/03/31

  3. Development of a tribology analysis solver ahead of the times

    Hiroshi Kuribara, Daisuke Kanayama, Yoshikatsu Nakano

    Offer Organization: Honda R&D Co., Ltd.

    System: Collaborative research

    Institution: Tohoku University

    2017/10 - 2021/03

  4. Development of environmentally conscious cleaning method using cryogenic fine solid particles and its application to high density hydrogen storage

    ISHIMOTO JUN, OCHIAI NAOYA, Combescure Alain

    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: Tohoku University

    2015/04/01 - 2018/03/31

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    The application of cryogenic high-speed spray of micro-solid nitrogen (SN2) to the non-aqueous resist-removal and ultra-cleaning system of semiconductor wafer is a focus of great interest. In the present study, we have newly developed the new single-component micro-nano SN2 particle production method by using super adiabatic Laval nozzle (converging-diverging nozzle). The physical photo resist removal-cleaning performance using cryogenic particulate spray are investigated by a new type of integrated ToF-SIMS, XPS measurement coupled supercomputing technique. As a result, it has been clarified that the newly developed cryogenic spray cleaning method is effective particularly for the removal and cleaning process of novolac type resists.

  5. Development of new cleaning-removal system using cryogenic micro-nano solid spray

    ISHIMOTO Jun, MATSUURA Kazuo

    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: Tohoku University

    2011/04/01 - 2014/03/31

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    The basic characteristics of a thermomechanical resist removal-cleaning system using cryogenic micro-nano solid nitrogen spray flow was investigated using a new type of integrated measurement coupled numerical technique. The effect of ultra-high heat flux cooling on the resist removal performance due to the thermal contraction of resist material was clarified. It was numerically predicted that resist removal performance could be improved by the scraping effect of impinging micro-solid nitrogen particle with plastic deformation in the narrow region between the resist. Furthermore, it was numerically and experimentally found that the hybrid interactive effects of fluid mechanical force by impingement of micro-solid particles and the thermomechanical effect due to ultra-high heat transfer characteristics contribute to the resist removal-cleaning process.

  6. Development of multiphase ultra-high heat flux electronic cooling system using micro-slush

    ISHIMOTO Jun, OHIRA Katsuhide

    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: Tohoku University

    2008 - 2010

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    The fundamental characteristics of the heat transfer and cooling performance of the micro-solid nitrogen particle spray impinging to the heated plate was numerically investigated and experimentally measured by a new type of integrated computational-experimental technique. The used Computational Fluid Dynamics (CFD) analysis based on Euler-Lagrange model is focused on the cryogenic spray behavior of atomized micro-solid nitrogen and on the ultra-high heat flux characteristics of the micro-solid particle. Based on the numerically predicted performance, a new type of cryogenic spray cooling technique which can be available to apply the ultra-high heat power density device is developed.

  7. マイクロ・ナノ固体窒素噴霧利用型超高熱流束冷却システムの開発 Competitive

    System: Cooperative Research

    2007/04 -

  8. 液体水素ピンホール漏えいジェット流の微粒化過程に関する融合数値予測 Competitive

    System: Cooperative Research

    2007/04 -

  9. マイクロ・ナノ固体窒素噴霧利用型半導体洗浄システムの開発 Competitive

    2007/04 -

  10. Forced Convection Heat Transfer Characteristics of Slush Nitrogen in Turbulent Pipe Flows

    OHIRA Katsuhide, ISHIMOTO Jun

    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: Tohoku University

    2006 - 2007

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    Slush Fluids, such as slush hydrogen and slush nitrogen, are two-phase (solid-liquid) single-component cryogenic fluids containing solid particles in a liquid. The objectives of the present study are to investigate the forced convection heat transfer characteristic and thermo-fluid instability of slush nitrogen flowing in a pipe, and to develop the numerical code to evaluate the thermo-fluid phenomenon of the slush fluid flowing in a pipe. Experimental tests were performed with the slush nitrogen in the ranges of solid fraction from 0 to 40 wt% and mean velocity from 1 to 6m/s to obtain both the forced convection heat transfer coefficient and the frictional pressure drop flowing in a horizontal copper pipe. Compared with the experimental results of subcooled liquid nitrogen, the deterioration phenomena of heat transfer coefficients for slush nitrogen caused by the pressure drop reduction were found and cleared in the present study. This is the important and useful result for applying the slush fluid as a refrigerant to superconducting equipments. Three-dimensional numerical simulation method including the gravity effect based on the two-fluid model has been developed to clarify the characteristics of the cryogenic two-phase slush fluid in a straight pipe flow. It was found that the calculated results were in good agreement with the velocity distributions of solid particles measured by the new PIV (Particle Image Velocimetry) method. In consequence, the developed numerical code has been verified to be able to calculate the slush flow characteristics with sufficient accuracy.

  11. 極低温マイクロスラッシュ二相流を用いた超伝導冷却システムの開発

    石本 淳

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 若手研究(A)

    Institution: 東北大学

    2005 - 2006

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    加圧過冷却液体窒素流と極低温ヘリウムガスの高速流の衝突により固体窒素の生成とマイクロ微粒化を可能にするマイクロスラッシュ二流体エジェクターノズルを新たに開発した.続いてこの新型二流体ノズルを用いたマイクロスラッシュ生成システムを構成し,基本性能に関するPIV可視化画像計測を行い極低温二相微粒化流動特性に関する検討を行うとともにCFD計算結果との比較検討を行った.その結果,以下の知見を得た. 1.マイクロスラッシュ噴霧流に関するPIV計測を行うことにより,マイクロスラッシュはノズル出口から数mm程度の区間で非常に粒子数密度の高い領域をもって形成され,スラッシュ噴霧角は非常に小さくスラッシュ相流速-周囲気相流速スリップ比はかなり大きい値を有することを明らかにした. 2.極低温ヘリウムガスの流量を増大させると,微粒化が促進され小粒径マイクロスラッシュの生成頻度が増大するが,粒子数密度は減少することを明らかにした.さらにマイクロスラッシュ粒子微粒化に際しては,過冷却液体窒素と寒剤である極低温ヘリウムガスの供給流量に最適値が存在する可能性があることを明らかにした. 3.CFD解析により,可視化実験によっては流動現象の把握が不可能であるノズル内領域における微粒化メカニズムが明らかにするとともに,マイクロスラッシュの生成領域に関しPIV計測結果との良好な一致を確認し,ノズル最適設計に対するCFD利用の有効性を示した.

  12. 微小重力液滴燃焼場の電磁場制御 Competitive

    2005/04 -

  13. 先端機能性流体混相流の活用による次世代マイクロスケール発電システムに関する融合研究 Competitive

    2005/04 -

  14. マイクロキャビテーションを伴う高速液体噴霧微粒化に関する一体型シミュレーション技術の開発と各種ノズル融合設計手法の確立 Competitive

    2005/04 -

  15. Study on Inert Gas-Form Extinction Method applied for Three-dimensional Arranged Fire

    ITO Akihiko, KUDO Yuji

    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: Hirosaki University

    2003 - 2005

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    To reveal the fire characteristics subsisting multiple fire sources and fire extinguishing by inert gas-form, experiments were conducted for two small pool fires arranged in three dimensions. Two different kinds of fuels, n-heptane (luminous flame) and methanol (non-luminous flame) were employed for test fuels. As a result, mass burning rates for both of pans are lager than that of a single pool fire, especially the burning rate for upper pan is remarkable increases compared with that for lower pan. The external radiation heat and induced air flow by multiple flames contributes to increase of the burning rate for multiple pool fires. To clarify the effects of external radiation and induced flow on burning rate for multiple fire sources, the model calculations considered the effects of radiative heat fluxes and change of flow fields. When the fires are separated, the increases of burning rate depend on the radiative heat flux emitted from the other fire. When the fire sources are arranged in three dimensions, we found that not only the effect of the external radiation but the effect of the flow field is important. When the pan diameter is larger, the effect of radiative heat flux is larger and the influence of flow fields is relatively small. From the characteristic of the three-dimensional fire obtained by this study, supplying a strong and high fluidity form to the upper fire efficiently is required. To make a strong and high fluidity form, the diameter of a form was changed and the fire-extinguishing experiment was conducted. By setting the diameter of a form to about 1mm, the fluidity and the intensity of a form were able to increase, and a three-dimensional fire was able to effectively extinguish.

  16. 液体ヘリウムキャビテーション流を用いた超流動マイクロ冷却システムの開発

    石本 淳

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 若手研究(B)

    Institution: 弘前大学

    2003 - 2004

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    常流動He Iの蒸気相への相変化時(キャビテーション生成時)におけるHe IIへの相転移と超流体対向流を利用した新型の超流動二相流冷却システム開発の基礎研究として,ラムダ点近傍におけるHe IからHe IIへの相転移と超流動性の影響を考慮に入れた多流体モデルに基づく基礎方程式系を新たに構築し,垂直先細-末広ノズル内の液体ヘリウム気液二相流動特性に関する二次元数値解析を行った.その結果,以下の知見を得た 1.常流体流に圧力降下に基づく蒸気相への相変化が発生すると,液相から蒸発潜熱が奪われる効果により気泡周囲とクラウドキャビティ内部の高ボイド率領域においてHe IからHe IIへの相転移(ラムダ転移)が生ずることを明らかにした. 2.常流体の蒸気相変化に起因するHe IIへの相転移が生ずると,超流体の常流体に対する対向流が誘起され,それに伴い気相流速分布が超流動ヘリウム特有の熱力学的効果の影響を受けることを確認し,気泡に対して温度こう配に基づく力(熱機械効果)等が作用することを明らかにした.この結果から,熱機械効果等を効果的に用いることにより,液体ヘリウム二相流中の気泡運動と流動場を制御できる可能性があることを明らかにした. 3.本解析により得られたクラウド・キャビティの形成・発達と移流・拡散現象に関わる二相流動様式は,可視化計測結果と傾向が定性的に一致していることを確認した.さらに,He Iキャビテーション生成と温度降下に伴うHe IIへのラムダ転移現象に関しても,飽和液体ヘリウムキャビテーションの温度計測に関する実験結果と傾向が定性的に一致していることを確認した.

  17. 超流動ヘリウム混相流を用いた極低温高速冷却システムに関する研究

    石本 淳

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 若手研究(B)

    Institution: 弘前大学

    2001 - 2002

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    ラムダ点近傍における超流動ヘリウム混相流の効果的活用による高速冷却システム開発および高性能化ための基礎研究として,鉛直ベンチュリ流路内における液体ヘリウムキャビテーション流れに関し,多流体モデルとEulerian-Lagrangianモデルに基づく超流動性を考慮に入れた基礎方程式系の定式化と数値解析を行うとともに,可視化画像処理を用いた実証実験を行い以下の知見を得た. ・常流体にキャビテーションが発生すると,特に気相生成が活発な高ボイド率領域においては,蒸気相生成の際に液相から蒸発潜熱が奪われることにより液相温度がλ点以下まで降下し,He IからHe II(超流体)への相転移が発生し超流動冷却効果が発生すること明らかにした. ・キャビテーション生成に基づくHe IIへの相転移時に生ずる超流体の対向流と,超流体温度こう配に起因する気泡運動を効果的に制御することにより,従来より高い冷却効率を有する極低温冷却システムの構築が期待できることを明らかにした. ・液体ヘリウム高速キャビテーション流の可視化計測装置を設計・試作し,PIV法を用いた流動場の観測と管内圧力・温度分布の測定を行った.その結果,He Iのキャビテーション発生時に温度降下が生じHe IIの超流動成分の流動に起因する流速分布・圧力変動を示すことを確認した.

  18. Study on Instabilities of Two-Phase He II/vapor flow in a pipe

    KAMIJO Kenjiro, MATSUMOTO Yoichiro, TOKUMASU Takashi, OIKE Mamoru

    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: Tohoku University

    2000 - 2002

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    The aim of this research is to analyze the flow instability of multi-phase flow of liquid helium which consists of superfluid, normalfluid and vapor phase. The experimental apparatus for the generation of multiphase flow of superfluid helium is improved. It is important to shield the superfliud helium from the heat for high accuracy measurement. To protect the liquid helium from the outside heat the copper shield is added to the upstream and downstream tank and around the test section. Using this improved apparatus, the two-phase flow of superfluid helium is generated at the test section and the data of the relation between Reynolds number and cavitation number are obtained. For this reason, it is confirmed that the cavitation number is decreased as the Reynolds number is increased. Moreover, the phenomena are analyzed by the numerical method. The two-phase flow is assumed as bubble cavitation and the governing equations are constructed so that continuum equation, momentum equation and energy conservation is satisfied. These equations are solved by SMAC method and the flow structure at the nozzle is analyzed. Consequently, at the blowdown, the pressure decreases immediately and vortex is generated downstream of the throat.

  19. 超流動液体ヘリウム非平衡沸騰混相流の複雑性流動に関する研究

    石本 淳

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 奨励研究(A)

    Institution: 弘前大学

    1999 - 2000

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    極低温下において複雑性を有する超流動液体ヘリウム非平衡混相流の基礎流動特性および熱伝達特性の解明を目的とし、オリフィスを有する二次元鉛直円管内における液体ヘリウム沸騰二相流に関して、多流体モデルに基づく超流動性を考慮に入れた基礎方程式系の定式化を行うとともに数値解析による理論的検討を行い、以下の知見を得た。 (1)液体ヘリウム沸騰二相流におけるボイド率分布ならびに圧力分布の時間発展解を数値的に求めることにより、液相から気相への相変化の過程で液相から蒸発潜熱が奪われ液相温度がλ点以下となることによりHe IからHe IIへの相転移が生じ、特に高ボイド率領域においてはHe II生成に基づく流動特性の大幅な変化が発生することを明らかにした。 (2)液相から気相への相変化が顕著である高ボイド率領域においては、He IからHe IIへの相移転(λ転移)が促進され、さらに超流体の常流体に対する対向流が誘起されることにより液相圧力こう配が変化し、気相ダクトの全領域にわたって散在する分布となって現れることを明らかにした。 さらに、超流動液体ヘリウム管内沸騰二相流の可視化計測装置を設計・試作し、高速度ビデオカメラを用いた流動場の二次元的観測を行い、液体ヘリウムの相変化速度が液体窒素のそれよりもかなり大きいことを確認するとともに、管軸方向の二相圧力・温度分布を計測し、蒸気相発生に基づくHe IからHe IIへの相転移を含む基礎流動特性に関する詳細な知見を得た。また、二相化により生じた液体ヘリウムの蒸気泡流は非常に微細な球形状を有し、超微細気泡雲となってダクト内に停留しスリップ比の大きい流動場を形成することを確認した。

  20. Study on Instabilities of Cryogenic Two-Phase Flows in a Pipe

    OIKE Mamoru, TUJIMOTO Yoshinobu, MATSUMOTO Yoichiro, KAMIJO Kenjiro, TOKUMASU Takashi, ISHIMOTO Jun

    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: TOHOKU UNIVERSITY

    1998 - 1999

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    Applications using cryogenic fluid generally encounter obstacles or complex pipe shapes such as an orifice or a converging-diverging nozzle. Therefore, a flow visualization study on boiling two-phase flow of liquid helium passing through the convergent-divergent nozzle of a horizontal pipe was carried out. The pipe is filled with pressurized liquid helium and flow immediately occurs by opening the on-off valve installed in the pipe outlet. Liquid helium is continuously supplied form the storage tank, the flow is accelerated at the nozzle throat and the phase change is induced by a pressure decrease. The transient evolution of the multi-bubble dispersion was observed from a high-speed video image. Comparison with results of liquid helium and liquid nitrogen indicated that the two-phase flow state of liquid helium is much more rapidly formed in a more homogeneous bubbly mixture two-phase flow than that of liquid nitrogen. The fundamental feature of two-phase flows is its multi-scale structure. Thus, numerical analyses were carried out in the following scales : The bubble formation in liquid oxygen was simulated by the Molecular Dynamics method. Lennard-Jones potential is used as the intermolecular potential. Simulations were carried out at various number densities in order to determine the number density at the limit of metastability. The results showed that in the liquid of diatomic molecules the bubble is formed at large number density than in the liquid of monatomic molecules against the prediction of the equation of sate of Lennard-Jones fluid. The direct numerical simulations of rising spherical bubbles in an impure liquid were conducted for various gravities and void fractions. The Navier-Stokes equations were solved by the finite difference method with the rectangular grid system. The mean velocity field induced by rising bubbles was investigated for various void fractions. The results showed that the boundary thickness becomes thinner in the higher void fraction due to the stronger bubble-bubble interaction. The two-dimensional characteristics of the oiling two-phase flow of liquid helium in a duct were numerically investigated. The governing equations based on the unsteady drift-flux model were conducted and several flow characteristics were numerically calculated, taking into account the effect of superfluidity. The results showed that the vapor gas phase rapidly spreads throughout the inner flow duct because of the change of the pressure gradient due to the effect of superfluidity which appears in momentum equations.

  21. 極限環境下における極低温混相流体の非平衡流れに関する研究

    石本 淳

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 奨励研究(A)

    Institution: 東北大学

    1997 - 1998

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    低温流体沸騰二相流を用いた応用機器開発のための基礎研究として,極低温流体気液二相流動特性の二次元的解明を目的とし,二次元水平ダクト内における液体ヘリウム沸騰二相流に関して,超流動性を考慮に入れた数値解析的検討を行い,以下の知見を得た. (1) 液体ヘリウム沸騰二相流におけるボイド率分布ならびに圧力分布の時間発展解を数値的に求めることにより,液体ヘリウムの超流体としての性質は,二相流動場の圧力分布の変化に起因する物性値の変化と,相変化の過程で液相から蒸発潜熱が奪われ混相流体温度がλ点以下となることにより生じることを明らかにした. (2) 液体ヘリウムに特有の超流体としての性質が混相流中に生じると,オリフィス部より下流側において圧力こう配が変化し,高ボイド率領域がダクトの全領域にわたって散在する分布となって現れることを明らかにした. (3) 液体ヘリウム二相流中の高ボイド率領域においては常流体蒸気相への相変化に基づく超流動性の影響が大きく現れ,超流体混相流の常流体混相流に対する対向流が発生するため双方の流速分布に差異が生じ,超流体の対向流がオリフィス後流渦の発達を抑制する効果となって働くことを明らかにした. さらに,液体窒素管内沸騰二相流の可視化計測装置を設計・試作し,PIV法を用いた流動場の二次元的計測を行い,低温流体の相変化速度が常温流体のそれよりもかなり大きいことを確認するとともに,管軸方向の二相圧力・温度分布を計測し,低温流体二相流動場の基礎流動特性に関する詳細な知見を得た.

  22. Investigation on Suppression Mechanism of Rotating Cavitation in Inducers

    KAMIJO Kenjiro, NAGASHIMA Toshio, YAMADA Hitoshi, ISHIMOTO Jun, OIKE Mamoru

    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: Tohoku University

    1997 - 1998

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    Rotating cavitation and cavitation surge occurred in a liquid oxygen pump inducer of the LE-7 engine and in a fluid system including the pump, respectively, Both the phenomena were almost completely suppressed by a simple modification of the inducer upstream housing. However, the mechanism of the suppression could not be fully explained. In this study suppression mechanism of the rotating cavitation and the common characteristics between rotating cavitation and cavitation surge were investigated. First, an experiment was performed using three inducer housings including a modified one and an inducer which had almost similar dimensions of the LE-7 pump inducer to obtain a map of modes of unsteady cavitating flows. It was clarified that the modified inducer housing shifted the region in which the rotating cavitation occurred to higher flow rates. Second, another experiment was conducted using a high speed filming and a particle image velocimeter(PIV) to observe the flow upstream of the inducer. It was clarified that the modified inducer housing increased back flow near the tip of the inducer inlet and that the back flow increased the cavity volume, which resulted in the increase of cavitation compliance. The increase of cavitation compliance is also considered to be a main cause of suppressing the rotating cavitation. Third, it was also clarified that rotating cavitation and cavitation surge was a very similar phenomena from both the experimental and theoretical analyses. Furthermore, fairly high frequency of the cavitation surge could be explained by taking into consideration the phase delay of the mass flow gain factor which is a major cause of both the rotating cavitation and cavitation surge. Fourth, it was confirmed that an analysis of a cryogenic two-phase flow which includes the effect of cavitating bubbles could be applied to the unsteady internal flow of an inducer.

  23. Study on Rocket-Based Combined-Cycle Engines

    KAMIJO Kenjiro, ISHIMOTO Jun, OIKE Mamoru, TUJIMOTO Yoshinobu, NAKAHASHI Kazuhiro, MASUYA Goro

    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: Tohoku University

    1997 - 1998

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    Recently, rocket-based combined-cycle (RBCC) engines have been discussed more frequently because of their attractive characteristics, such as an increased payload-to-take-off-weight ratio and a higher specific impulse. In this study the ScramLACE (liquefied air cycle / supersonic-combustion ramjet) engine was chosen for the transatmospheric accelerating mode of the RBCC system to investigate the feasibility of using the LACE mode and the Scramjet mode combination with the RBCC system. An experimental study on cooling the heat exchanger by liquid hydrogen was conducted to validate a method of estimating the air liquefaction ratio, alpha, based on the study of corrugated-straight-fin heat exchangers. The results showed that the measurements of alpha are well coincident with the calculations obtained by this method of estimating alpha. Based on this method of estimating alpha, the relationship between alpha and the flight Mach number, M, was obtained using a parameter of the heat transfer area of the heat exchanger in order to evaluate the system performance of a basic model of the LASE system. From the results, it was clarified that changing a hydrogen supply line from LACE 1 to LACE 2 at a selected value of the flight Mach number is one of the most reasonable ways to achieve a high specific impulse during the LACE mode operation, M=1 to 5. An experiment of an air intake model during the LACE mode operation was performed using a supersonic wind tunnel to validate numerical results obtained from Navier-Stokes equations. It was found that this computational method has sufficient accuracy to evaluate the qualitative performance of the supersonic intake. Based on this method, characteristics of two types of the intake model were investigated. Effect of airframe integration on scramjet performance were calculated on the assumption of quasi-one-dimensional flow. Three different types of airframe integration were investigated. From the results, it was clarified that it is desirable for the engine to be integrated on the airframe paralleled to the airframe axis, as well as to have an inlet inhaling the air compressed by the shock wave from the nose of the airframe. The pseudo-shock waves in rectangular scramjet isolators with steps were investigated, When the front of the pseudo-shock waves first reached to the step, pressure at the first shock vibrated with the clear frequency peak of 320-480 Hz. Then the pseudo-shock waves propagated further upstream of the step, the pressure around the first shock vibrated with 100-200 Hz. From these results, it was found that these features in the rectangular duct with the step were caused by the recirculation right downstream of the step.

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Social Activities 3

  1. 高校生への研究活動紹介

    2010/12/07 -

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    盛岡一高 高校生への研究活動紹介

  2. Science Direct TOP 25 Hottest Articles

    2008/08 -

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    Elsevier社のCryogenics誌において，2008年4月～7月の期間において最もダウンロード回数の多い論文のTop 25を集計したところ，以下の論文は21位にランクインした． Integrated numerical prediction of atomization process of liquid hydrogen jet Cryogenics, Volume 48, Issue 5-jun, May 2008, Pages 238-247 Ishimoto, J.; Ohira, K.; Okabayashi, K.; Chitose, K.

  3. FM放送番組「りんご王国こうぎょくカレッジ」出演

    2004/07/18 -

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    テーマ「キャビテーションの不思議」 番組名称「りんご王国こうぎょくカレッジ」 番組コンセプト：「コミュニティＦＭアップルウェーブを通じて行う地域貢献のための公開講座」という形をとった教育的雰囲気を持つ番組 番組のボリューム：日曜日午後６時から１時間 番組の構成：講義形式，対談を選択。２０分×３セクション（他の形式も可） 番組の種別：すべて録音 スタッフ：ディレクター兼番組責任者（庄司）、ミキサー、アシスタントほか

Media Coverage 14

  1. 世界で初めてスパコンによる「摺動部摩耗」と「焼付き発生部位」のシミュレーション予測に成功

    産経新聞　産経 東北6県版（15段）

    2022/10/08

    Type: Newspaper, magazine

  2. Computationally predicting where the wear will occur in engines

    ScienceDaily

    2022/10/06

    Type: Internet

  3. 経営ひと言／東北大学・石本淳教授「幅広く使える」

    日刊工業新聞

    2022/10/05

    Type: Newspaper, magazine

  4. ピストンエンジンの摺動部摩耗、３Ｄ予測で特定 東北大・ホンダが成功

    日刊工業新聞

    2022/10/04

    Type: Newspaper, magazine

  5. 東北⼤、スーパーコンピューターでエンジンの摺動部摩耗と 焼付き発⽣部位のシミュレーション予測に成功

    ⽇本経済新聞

    2022/09/30

    Type: Newspaper, magazine

  6. グラフ理論を用いたCOVID-19パンデミックAI予測 Myself

    AI Japan R&D Network　https://www.ai-japan.go.jp/603/covid-19ai

    2020

    Type: Internet

  7. 半導体洗浄，人体に害無く －東北大が新技術 固体窒素を利用－

    日経産業新聞

    2011/10/07

    Type: Newspaper, magazine

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    東北大学流体科学研究所の石本淳准教授と寒川誠二教授らの研究チームは，半導体素子の製造に欠かせない洗浄工程で有害物質を不要にできる新技術を開発した． 現在のプラズマ照射と有害な薬剤を使う洗浄の2工程を，固体窒素の微粒子を吹き付ける1工程に置き換える．本技術は洗浄プロセスにおけるプラズマ照射による配線ダメージを回避し，特に酸素ラジカルによりダメージを受けやすいデバイスに対して有効で，環境調和型のエコ洗浄技術として注目されている． 開発したのは大規模集積回路(LSI)製造工程に組み込む洗浄技術．微細な回路パターンはフォトレジスト(感光性樹脂)を使い書き込んだ後，レジストを取り除く．現在は酸素プラズマで分解した後，残った不純物などを有害なアンモニアや臭化物の溶液で洗い流している．新技術は固体窒素の微粒子を高速で吹き付けるだけで済む．微粒子は液体窒素を急速冷却して作る．内径1mmのノズルから毎秒30mの速さで噴き出す極低

  8. 原発配管の劣化箇所予測 新システムで画像化

    日経産業新聞

    2011/06/21

    Type: Newspaper, magazine

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    東北大学の石本淳准教授らは東北電力と共同で、原子力発電所の配管劣化を画像化できるコンピューターシミュレーション(模擬実験)システムを開発した。配管が破断する事態を予測し、事故を未然に防ぐだけでなく、丈夫な配管の設計にも役立つ。東北電・女川原発の運転再開に合わせて利用を開始する。名称は「配管脆弱(ぜいじゃく)箇所予測システム」。東北大と東北電が3年かけて開発した。配管の形状、通過する水蒸気の流速、温度、圧力などのデータを入力すると、配管の厚さが減少する様子が表示される。 特に配管の曲がった部分は水蒸気が内側から衝突して肉厚が減少しやすい。開発したシステムを使えば肉厚減少の時間経過を可視化できる。 石本准教授は東京電力福島第1原発では、津波でなく地震の震動で脆弱な配管が破断した可能性も否定できないとみており、「原発の設計図が提供されれば計算できる」と話している。

  9. CAT-V 120ch Meet the professor -TOHOKU UNIVERSITY-

    CAT-V

    2010/11/26

    Type: Other

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    http://www.cat-vnet.tv/category120/120_011/120_011_0001_a.html

  10. ヘリウムでつくる窒素の粉雪，東北大，微粒子状固体窒素の連続生成装置を開発

    ガスレビュー

    2007/11/15

    Type: Newspaper, magazine

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    ヘリウムでつくる窒素の粉雪，東北大，微粒子状固体窒素の連続生成装置を開発

  11. 粒径0.1mm以下の固体窒素粒子 連続生成技術を開発

    日刊工業新聞

    2007/07/17

    Type: Newspaper, magazine

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    東北大学流体科学研究所 石本 淳 准教授は高温超伝導ケーブル用新型冷媒として適用可能な，粒径0.1mm以下の固体窒素粒子（極低温マイクロスラッシュ）の連続生成技術開発に成功した．同技術は「断熱二流体ノズル方式」という従来にない新型粒子生成法を開発したものであり，過冷却液体窒素に極低温ヘリウムガスを高速衝突させることにより，大気圧開放雰囲気においても均一球形状の超小型固体窒素粒子を連続生成することが可能である．開発には流体科学研究所未来流体創造センターのスーパーコンピューターを用いた融合計算手法が用いられており，固体窒素粒子の噴霧流動をコンピューター上で数値予測してノズルのバーチャルプランニングを行った後，実際の装置に関する最適設計・製作が行われている．

  12. 効率的な冷却システム実現 微細窒素粒子を生成

    河北新報

    2007/06/20

    Type: Newspaper, magazine

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    高温超伝導ケーブルの冷却に用いる微細な固体窒素粒子（極低温マイクロスラッシュ）の生成技術を開発した．本生成法による高機能性マイクロスラッシュ冷媒を用いることにより，従来型の液体窒素単相流を用いる冷却法よりも数倍程度の冷却能を有し，かつコンパクトな超電導ケーブル冷却システムを実現できることから、電力の需要増などに対応する次世代型ケーブルの実用化に大きく貢献するものと期待される．研究成果は2007年6月20日の河北新報に紹介された．

  13. 異種物体の混合研究で論文賞

    東奥日報

    2003/07/30

    Type: Newspaper, magazine

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    弘前大学理工学部の石本淳助教授(36)がこのほど、日本混相流学会の論文賞を受賞した。受賞論文は石巻専修大学の尾池守教授、東北大学の上條謙二郎教授らとの共同研究によるもので、石本助教授が筆頭著者。石本助教授は「研究が評価されてうれしい。地方大学でも最前線の研究ができるのを証明した」と語っている。 日本混相流学会は、空気と水、砂と水といった異種物体が混合した流体の流れと、その工学的応用について研究する学会。現在、約六百五十人の会員がいる。 学会賞は六種類あり、今回の二〇〇二年度学会賞は論文賞と技術賞に該当者があり、全部で三研究グループが選ばれた。 受賞論文は、二〇〇一年に米専門誌に掲載されたもので、タイトルは「多流体モデルを用いた液体ヘリウム管内二相流の数値解析」。 超流動ヘリウムと同じ効果を持つ常流動ヘリウムをつくり出す方法を開発した。 超電導磁石を利用したリニアモーターカーなどの装置の縮小

  14. インテリジェントコスモス奨励賞を受賞した弘前大学理工学部助教授 石本淳さん

    東奥日報

    2003/02/14

    Type: Newspaper, magazine

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Academic Activities 1

  1. 混合したながれ

    2018/08/24 -

Other 22

  1. 反応性混相流の活用によるナノデバイス物理洗浄

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    半導体製造工程においては電子基板のフォト製版工程で不要になったレジストを除去する必要があり、現在はコストが高く人体に極めて有害な薬液が大量に使用されている．半導体洗浄に関しては，アンモニア過酸化水素水を用いたWet洗浄プロセスが一般的であるが，最近の高集積デバイスに対してこのようなエッチングによるリフトオフを用いた洗浄法は適用限界に近づきつつある．これに対し，ドライ洗浄法の一例として低温エアロゾル洗浄がケミカルフリーな洗浄法として提案されているが，これは液体窒素の断熱膨張のみを利用した固体窒素粒子形成法を用いており，基本的なアッシングプロセスが終了した後の不要微小固体粒子を窒素粒子で吹き飛ばすのみで，生成固体窒素粒子の除去性能は弱く，レジストをはく離するまでの力学的性能を有せず，粒径や数密度の制御が不安定という難点を有する．そこで，これら従来型の化学反応プロセスに依存した洗浄法の有する欠点を解決しうる，新しい発想から成る新型アッシングレス・ドライ洗浄システムの開発が強く望まれている． このような現状に対し，本研究により開発を目指しているマイクロ・ナノソリッドジェット利用型アッシングレスレジストはく離・除去システムは，マイクロ・ナノソリッド粒子の運動力学的高速衝突と極低温粒子流の有する超高熱流束特性を利用し，従来のケミカルWet洗浄の有する適用限界を打破しうる完全ケミカルフリー，純水フリータイプ，ドライ型レジストはく離・洗浄システムを開発しようとしている点に新規性・優位性を有する．

  2. マイクロ・ナノ固体粒子噴霧流を用いた半導体スーパー洗浄

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    マイクロ・ナノ固体粒子噴霧流を用いた半導体スーパー洗浄

  3. 極低温マイクロ・ナノソリッドを用いたスーパードライ型半導体洗浄

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    過冷却液体窒素と極低温ヘリウムガス（寒剤）の高速衝突により連続生成される微細固体窒素粒子から成るマイクロ・ナノスラッシュ噴霧流の有する超高熱流束冷却特性とそれに伴うレジスト熱収縮効果を有効活用した新型半導体洗浄法に関する検討を行う．マイクロスラッシュ噴霧を高温加熱ウエハー面上のレジストに高速衝突させ，粒子の慣性力と噴霧の熱流体力学的効果，超高熱流束急冷によるレジスト熱収縮効果の相互作用により，アッシングプロセスを経ずにレジストをウエハー面上からはく離・除去，洗浄するという，レジスト除去・洗浄同時プロセス機構から成るドライ型アッシングレス洗浄システムを開発する．その結果，マイクロ・ナノスラッシュジェットの衝突による物理的レジストはく離と超高熱流束急冷による熱収縮の相乗効果を利用し，フォトレジストの一部をはく離することに成功した．加熱無しの場合，レジストはく離には至らないことから，レジストはく離に及ぼす熱収縮効果の影響はかなり大きいことを明らかにした．

  4. マイクロ・ナノスラッシュ噴霧による新型半導体洗浄方式の開発

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    マイクロ・ナノスラッシュ噴霧による新型半導体洗浄方式の開発

  5. スラッシュ超高熱流束プロセッサの研究

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    スラッシュ超高熱流束プロセッサの研究

  6. 極低温マイクロスラッシュジェットを用いた レジストはく離システムの開発

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    半導体ウェハー製造プロセスにおける，完全ケミカルフリー，純水フリータイプ，ドライ型極低温マイクロスラッシュの高速二流体ジェット流を用いた新型レジストはく離・除去システムを開発する．従来型の極低温エアロゾル洗浄法とは異なり，過冷却液体窒素と極低温ヘリウムガス（寒剤）の高速衝突により連続生成される微細固体窒素粒子から成るマイクロスラッシュ噴霧流をウェハー面上のレジストに衝突させ，粒子の慣性力と噴霧の熱流体力学的効果の相互作用によりレジストをウェハー面上からはく離・除去，洗浄するシステムの開発である．本システムは，液体窒素と極低温ヘリウムガスの流量制御によるスラッシュ粒径制御が可能である。

  7. 原子力発電所における液滴衝撃エロージョン予測に関する研究

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    原子力発電所において最も多くトラブルが頻発し大事故に直結する事象となりうるのが，配管系における減肉現象である．減肉とは高速流動・腐食（エロージョン・コロージョン）その他の要因により配管内部の材料組織が浸食され，配管に穴が開き，ついには破断に至る現象である．これは原子炉内配管が非常に複雑な形状を有し，なおかつ高温・高速という非常にシビアな条件で配管内流動が行われているからであり，現在のところ減肉現象を事前に予測あるいは未然に防止することは非常に困難である． 本研究は，原子力発電所の配管系と高速熱流動をスーパーコンピュータ上に再現し，トラブルの発生箇所・原因を事前に予測するシステムを確立することを目的とする．本システムの実用化により，原子炉保守・点検に要する時間的・人的コストは大幅に軽減化し，極めて安全性の高い原子力発電の運用が可能になると言える． 本年度実施した数値計算結果より，オリフィス絞り部直下において過冷却度が急激に上昇することを明らかにするとともに凝縮液滴発生位置を特定した．また，蒸気流の湿り度が上昇した場合，オリフィス下流は超音速流れになり，テーパー型 オリフィスでは流速の急激な上昇が起こる可能性があることが明らかとなった．

  8. マイクロ・ナノスラッシュジェットを用いた半導体スーパー洗浄

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    【研究目的】 半導体ウエハー洗浄プロセスにおける，完全ケミカルフリー・純水フリータイプ・極低温マイクロ・ナノスラッシュの超高速ジェット流を用いた，ドライ型アッシングレス洗浄システムを開発する． 【オリジナリティ】 従来型の極低温エアロゾル洗浄とは異なり，過冷却液体窒素と極低温ヘリウムガス（寒剤）の高速衝突により連続生成される微細固体窒素粒子から成るマイクロ・ナノスラッシュジェット噴霧流をウエハー面上のレジストに衝突させ，粒子の慣性力と噴霧の熱流体力学的効果，超高熱流束急冷によるレジスト熱収縮効果の相互作用により，アッシングプロセスを経ずにレジストをウエハー面上からはく離・除去，洗浄するという，レジスト除去・洗浄同時プロセス機構から成るドライ型アッシングレス洗浄システムを開発しようとしている点に独創性を有する．また，従来型のブラスト洗浄に用いられているCO2よりも分子量の小さいN2の固体粒子を用いることにより，微細パターン特に次世代型3次元ゲート構造の配線パターンに及ぼす粒子衝撃ダメージを極力軽減させ，洗浄時における歩留まりを向上させることが可能になる点にも独創性を有する．さらに，N2は不活性ガスであるので，チャージダメージがほとんど生ぜず，新Low-k材料へのダメージが少ないと言うメリットを有している．

  9. Massively parallel integrated computation of micro-atomizing spray mechanism

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    ガソリンインジェクターノズル内における高速現象を伴う微粒化現象に対し，新型バロトロピックLES-VOF法を用いることにより統一的に数値シミュレーションすることが可能な専用ソルバーを開発し，超並列融合計算手法によりインジェクター噴霧マイクロ微粒化機構に及ぼすキャビテーション等の高速現象の影響を明らかにする．実施に当たっては，対象とする計算内容が複雑・高難度であるため，専用の「超並列流体融合計算システム」と，流体研スーパーコンピュータを用いる．

  10. 原子力発電所における配管減肉予測システムの開発に関する研究

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    女川２号機高圧給水加熱器ベント系配管の減肉事例をもとに，液滴衝撃エロージョンによる配管これらの減肉予測コードを開発し，これに基づく本事象事象発生のメカニズムを解明および今後の確実かつ合理的な液滴衝撃エロージョン管理に資することを目的とする。

  11. マイクロスラッシュ噴霧流利用型超高熱流束電子冷却システムの開発

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    次世代高性能CPUは従来のCPUに比べて消費電力が高く，熱流束が レベルの放熱性能を有しなければ所定の性能を発揮出来ず，現在の液冷法ならびに強制対流沸騰熱伝達を用いてももはや追従できないレベルにまで達するものと予測される．以上の困難を打破しうる10^6 W/m^2レベルの超高熱流束の冷却性能を有する新型電子冷却システムを開発することを主目的とする．

  12. ガソリンインジェクタの噴霧シミュレーションに関する研究

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    インジェクタ噴孔上流流れを含めた数値解析を行い，インジェクタ内部流やキャビテーションなどの諸因子が微粒化へ及ぼす影響に関して検討を加える．

  13. 氷状フレーク窒素を用いた超伝導ケーブル冷却法の開発

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    本研究では，氷状フレーク窒素二相流を用いた長距離超伝導ケーブルの極低温冷却システム開発を目的とし，スラッシュ窒素－過冷却窒素二相流の熱・流動特性ならびに冷却効果に関して，最新の多流体モデルに基づく混相流数値解析とスラッシュ窒素生成・流動試験装置を用いた基礎実験による総合的研究を行うことを計画している．本研究により，超伝導体ケーブルの新型冷却法としてスラッシュ窒素の融解潜熱を利用し，過冷却液体窒素を利用する場合よりも高効率の冷却効果が期待できるシステムを実現させる．さらには冷却流路内部形状を変化させ，圧力こう配の変化に基づくスラッシュの加速流動を促進させることにより熱伝達性能を向上させることを目的としている．また，極低温スラッシュ製造技術は窒素はもとより水素に対しても転用可能であるので，スラッシュ水素の利用による燃料電池用バッテリーの小型化や液体燃料ロケット用推進剤ストレージ系の軽減化に寄与するものと考えられる．

  14. 垂直先細―末広ノズル内における磁性流体キャビテーション流れに関する数値解析

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    先細―末広ノズル内における磁性流体キャビテーション流れに関する数値解析

  15. 超流動ヘリウムキャビテーション流れの活用による新型冷却システムの開発

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    超流動ヘリウムキャビテーション流れの活用による新型冷却システムの開発

  16. 超流動ヘリウムキャビテーション流れを用いた極低温高速冷却システムの開発

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    液体ヘリウムの管内キャビテーション流れを利用することにより，液体ヘリウム単相流冷媒を用いるよりも高性能の超流動冷却効果が得られる新型極低温混相流高速冷却システムの開発を目的としている．この方式による冷却法は，冷媒自身のキャビテーション初生に基づく蒸発潜熱の移流効果を利用しヘリウムIIの相転移を生成させ，超流体対向流による極低温冷却を可能なものにする． 本冷却方式により，究極の寒剤である超流動ヘリウム混相流の特異な性質を混相流応用機器の高速冷却システムとして有効に利用できれば，その工学的有用性は非常に高いといえる．

  17. スラッシュ窒素を用いた長距離超電導ケーブル冷却に関する研究

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    スラッシュ窒素を用いた長距離超電導ケーブル冷却に関する研究

  18. スラッシュ窒素を用いた長距離超電導ケーブル冷却に関する研究

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    スラッシュ窒素二相流を用いた超伝導冷却システムを利用することにより，1) 固相粒径をミリオーダからマイクロオーダまで最適制御することにより，混相冷媒流体の二相見かけ粘度を低下させ冷媒流路内における圧力損失の軽減化が可能，2) マイクロオーダの粒径を有効活用することによるマイクロチャネル内のMEMS冷却が可能，3) Slush Phaseのポンピング効果（Liquid-Slush運動量交換）による流体加速と伝熱促進が可能であることを明らかにした．

  19. 積雪寒冷地における自然エネルギー利用技術の開発研究

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    (2) 冬季季節風を利用した風力発電による融雪システムの実用化に関する研究 （弘前大学理工学部） 青森県は北海道に並んで風力資源に恵まれており，現在，県内数ヶ所で規模の大きな風力発電が実施ないし計画されている。しかし風力エネルギーは広く分散しているため，まだ十分には利用されていないのが実状である。この潜在的な自然エネルギーの有効利用を図るために，本研究では，季節風の強い市街地（あるいは市街地に隣接する地域）で風力発電を行い，その電力を利用してコミュニティ規模の融雪を行うシステムを構築するために，基礎的なフィールド実験を行う。実用化のためには，低騒音であることと低コストであることに加えて，小型（回転翼の直径が３ｍ以下）であることからくる発電効率の低下，また発電装置への積雪・雪氷の問題を解決する必要がある。 本研究では，小型発電装置を実際に設置して，年間を通じた風況や発電能力を調べるフィールド実験を行うとともに，既設の風洞を利用して発電装置周りの風の流れを調べ，発電効率の向上を探る。また，ウッドセラミックスヒータを用いた融雪システムについて，融雪のメカニズムを調べ，融雪効率の向上を図る。さらに，風力発電システムと融雪システムと組み合わせて，システム全体の効率化を図り，小型風力発電による融雪システムの技術開発を目指す。

  20. 積雪寒冷地における自然エネルギー利用技術の開発研究

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    積雪寒冷地における自然エネルギー利用技術の開発研究

  21. アルミインゴットクラック軽減型ミストクーリングシステムの開発

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    アルミインゴットクラック軽減型ミストクーリングシステムの開発

  22. 微小重力単一液滴燃焼時における振動現象に関する基礎研究

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    微小重力単一液滴燃焼時における振動現象に関する基礎研究

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