Study of boundary conditions for engineering surfaces in micro thermal-fluid fields

• Project/Area Number: 18K03946
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 19010:Fluid engineering-related
• Research Institution: Nagoya University
• Principal Investigator: Yamaguchi Hiroki 名古屋大学, 工学研究科, 准教授 (50432240)
• Co-Investigator(Kenkyū-buntansha): 松田 佑 早稲田大学, 理工学術院, 准教授 (20402513)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: 高クヌッセン数流れ / 適応係数 / 散乱分布

Outline of Final Research Achievements

In a micro-thermal flow field with a large Knudsen number, the boundary conditions at solid surfaces have a large influence. The boundary condition in such a field is usually modeled using a parameter called the accommodation coefficient, which represents the average degree of accommodation of gas molecules to the solid surface. In this study, we developed systems to measure the energy accommodation coefficient (EAC) for heat transport and the tangential momentum accommodation coefficient (TMAC) for flow resistance on the same solid surface sample. A method to determine the parameters of the boundary condition model from the measured accommodation coefficients was studied based on the data in literature. Finally, we obtained the parameters from our measured data, and the boundary condition model was studied.

Academic Significance and Societal Importance of the Research Achievements

マイクロ熱流動場においては，固体表面での状態を決める境界条件モデルが重要な役割を担う．この境界条件モデルについて検討し，二つの適応係数を計測することによって境界条件を決定できることを明らかにした．そして，それを実現するために，同一の固体表面試料に対して二つの適応係数の計測手法を開発するとともに，適応係数から境界条件モデルのパラメータを決定する方法を解析した．

Research Products

• [Journal Article] Measurement of Heat Transfer from Anodic Oxide Film on Aluminum in High Knudsen Number Flows (2020)
  • Author(s): Yamaguchi Hiroki、Kito Kenji
  • Journal Title: Micromachines Volume: 11 Issue: 3 Pages: 234-234
  • DOI: 10.3390/mi11030234
  • Peer Reviewed / Open Access
• [Journal Article] Measurement of conductive heat transfer through rarefied binary gas mixtures (2019)
  • Author(s): H. Yamaguchi, J. Hosoi, Y. Matsuda, T. Niimi
  • Journal Title: Vacuum Volume: 160 Pages: 164-170
  • DOI: 10.1016/j.vacuum.2018.11.021
  • NAID: 120006623811
  • Peer Reviewed
• [Presentation] MEASUREMENT OF HEAT TRANSFER IN HIGH KNUDSEN NUMBER FLOW FROM ANODIC OXIDE ALUMINUM FILMS (2019)
  • Author(s): H. Yamaguchi, K. Kitou
  • Organizer: International Symposium on Thermal Effects in Gas flows In Microscale (ISTEGIM 2019)
  • Int'l Joint Research
• [Presentation] 陽極酸化皮膜における熱的適応係数の計測 (2019)
  • Author(s): 山口浩樹，鬼頭憲司
  • Organizer: 日本機械学会2019年度年次大会
• [Presentation] 接線方向運動量適応係数に対する流路材質の影響 (2018)
  • Author(s): 山口浩樹，森大騎，松田佑，新美智秀
  • Organizer: 日本流体力学会年会2018
• [Presentation] マイクロスケール気体流れに対する実験的計測 (2018)
  • Author(s): 山口浩樹，松田佑，新美智秀
  • Organizer: 第79回応用物理学会秋季学術講演会
  • Invited