高クヌッセン数流れにおける固体壁面での反射境界条件の検討

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書誌事項

タイトル別名
  • Study of Reflection Boundary Conditions on Solid Wall Surfaces in High Knudsen Number Flows
  • (Influence of Adsorbed Water Molecules on Scattering Properties of Gas Molecules)
  • （吸着水分子が気体分子散乱特性に及ぼす影響）

抄録

<p>In flows around a spacecraft or flows in micro/nanoscale channels of MEMS/NEMS devices, the ratio of the mean free path λ of gas molecule to the characteristic length L of the flow (Knudsen number: Kn = λ/L) becomes large. In these flows, the scattering behavior of gas molecules on a solid surface has a considerable influence on the flow; therefore, the boundary condition for the gas molecules reflected at the solid surface is considerably important. In this study, we consider a Couette flow of a rarefied Ar gas with heat transfer between two parallel walls. The upper wall is assumed to move with a constant velocity (U0), while the lower wall remains stationary. The temperature of the lower wall TL is set at 300 K, while the upper wall TU is set at 360, 450, or 600 K. The Knudsen number Kn is set at 0.2. We simulate the reflection of gas molecules on the lower wall by Molecular Dynamics (MD) method to represent the gas-surface interaction while, at the upper wall, we assume the diffuse reflection of the gas molecules. We apply the Direct Simulation Monte Carlo (DSMC) method to analyze the gas motions between two walls, assuming the gas molecules to be hard spheres. We obtain both of the accommodation coefficients for the gas molecules and the velocity distribution functions. Furthermore, we discuss the validity of Maxwell-type reflection model.</p>

収録刊行物

  • 年次大会

    年次大会 2018 (0), J0530305-, 2018

    一般社団法人 日本機械学会

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