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Exploration of surface nano structures to control micro thermal flow fields in the high Knudsen number regime

Research Project

Project/Area Number 21K03853
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 19010:Fluid engineering-related
Research InstitutionNagoya University

Principal Investigator

Yamaguchi Hiroki  名古屋大学, 工学研究科, 准教授 (50432240)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords高クヌッセン数流れ / 適応係数 / 境界条件
Outline of Research at the Start

マイクロ・ナノスケールの熱流動場においては境界条件によってその構造が大きく変化する.境界条件は,特に高クヌッセン数となる環境では,適応係数によってかなり表現することができる.そこで本研究では,様々な技術や材料により実現された表面ナノ構造を持つ固体表面を幅広く探索し,様々な性状の固体表面において適応係数がどのように変化するかを調査し,それらを用いることでマイクロ熱流動場の制御を実現することを目指す.

Outline of Final Research Achievements

A high Knudsen number micro-thermal flow field is strongly affected by the boundary conditions due to its large specific surface area. As parameters of the boundary conditions, we focused on the accommodation coefficients, which statistically represent the degree of accommodation of molecules to a solid surface. We explored the solid surfaces from the accommodation coefficients and studied the relationship between the surface properties and the boundary conditions on various processed and/or treated surfaces.
For the same sample surface, the energy accommodation coefficient related to a heat transfer and the tangential momentum accommodation coefficient related to a flow resistance were measured. These results suggested that the characteristics might not change monotonically, contrary to previous findings. From a complementary study of two accommodation coefficients, it was found that there were conditions that could not be described by the conventional scattering models.

Academic Significance and Societal Importance of the Research Achievements

高クヌッセン数のマイクロ熱流動場の状態を決定づける重要な要素としての固体表面における境界条件について,同一の固体表面試料に対して複数の適応係数を計測することにより探索した.その結果としてこれまでにはあまり知られていない特性をいくつか明らかにすることができ,得られた知見を発展させることによって将来的には固体表面を用いたマイクロ熱流動場の制御につながることが期待される.さらにその結果としてより効率的なマイクロ熱流動場の利用が可能になっていくと考えられる.

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (7 results)

All 2024 2023 2022 2021

All Presentation (7 results) (of which Int'l Joint Research: 3 results)

  • [Presentation] 工業表面における接線方向運動量適応係数の計測2024

    • Author(s)
      山口浩樹,遠藤周
    • Organizer
      日本機械学会2024年度年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 金属細線に対する接線方向運動量適応係数計測手法の開発2023

    • Author(s)
      川上大河,山口浩樹
    • Organizer
      日本流体力学会年会2023
    • Related Report
      2023 Annual Research Report
  • [Presentation] SCATTERING BEHAVIOR INVESTIGATED FROM MEASUREMENTS OF ACCOMMODATION COEFFICIENTS2023

    • Author(s)
      H. Yamaguchi, M. Osada, S. Endo, H. Okazaki
    • Organizer
      The 4th European Conference on Non-equilibrium Gas Flows
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Measurements of thermal and tangential momentum accommodation coefficients on a solid sample surface in high Knudsen number flows2022

    • Author(s)
      H. Yamaguchi, M. Osada, S. Endo
    • Organizer
      32nd International Symposium on Rarefied Gas Dynamics
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 適応係数から探るヘリウム分子の固体表面との相互作用2022

    • Author(s)
      山口浩樹,長田海裕,遠藤周
    • Organizer
      日本流体力学会年会2022
    • Related Report
      2022 Research-status Report
  • [Presentation] Measurements of thermal and tangential momentum accommodation coefficients on a solid sample surface in high Knudsen number flows2022

    • Author(s)
      H. Yamaguchi, M. Osada, S. Endo
    • Organizer
      The 32nd International Symposium on Rarefied Gas Dynamics
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 回転円板による接線方向運動量適応係数の計測2021

    • Author(s)
      高橋知宏,山口浩樹
    • Organizer
      日本流体力学会年会2021
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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