2023 Fiscal Year Final Research Report
Exploration of surface nano structures to control micro thermal flow fields in the high Knudsen number regime
| Project/Area Number |
21K03853
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 19010:Fluid engineering-related
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| Research Institution | Nagoya University |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 高クヌッセン数流れ / 適応係数 / 境界条件 |
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| 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.
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| Free Research Field |
分子流体工学
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| 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．
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