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1998 Fiscal Year Final Research Report Summary

Dynamics of Gas Molecule near the Surface in Rarefied Flow

Research Project

Project/Area Number 09450074
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionYokohama National University

Principal Investigator

MATSUI Jun  Yokohama National Univ., Faculty of Eng., Assistant Professor, 工学部, 助教授 (40251756)

Co-Investigator(Kenkyū-buntansha) MATSUMOTO Yoichiro  Univ.of Tokyo, Faculty of Eng., Professor, 工学部, 教授 (60111473)
Project Period (FY) 1997 – 1998
Keywordsrarefied flow / gas surface interaction / diffuse scattering / boundary condition / molecular dynamics
Research Abstract

1) Using the molecular-dynamics simulation method, the scattering process of gas molecule on the surface with adsorbale gas molecules. There are 4 patterns of scattering process, that associated with the distribution of energy-transfer from gas molecule to other molecules. The parameters such as mass ratio of gas molecule, potential coefficients, number of adsorbate on surface are changed in the simulation, and their dependency on the scattering process is studied.
2) To study the sticking and escaping dynamics of gas molecule in thermal equilibrium stale, the behavior of Xenon molecules between two plate of Platinum are simulated for a long period. The escaping process has three types. Two of them are caused by interaction from adsorbated gas molecule. Also the dependency of escaping molecules on the coverage coefficients are studied.
3) The effrect of roughness of the surface to rarefied gas flow is estimated by "Direct Simulation Monte Carlo" method. The test case is Couette flow between two plates. One plate has some roughness that simulate the shape made by cutting bite of the lathe. With high Knudsen number, the effect of roughness reaches to all the flow field by some vortex structure at the sharp edge of roughness. The parameter study is done on the height of roughness, angle of bite, and Knudsen number.

  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] J.MATSUI, 他: "Numerical Study of Molecular Scattering on the Surface with Adsorbate Molecules" Proc.of 21th International Symposium on Rarefied Gas Dynamics. (in printing).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.MATSUI,M.NAKAKITA,and Y.MATSUMOTO: "Numerical Study of Molecular Scattering on the Surface with Adsorbate Molecules" Proc.of 21th International Symposium on Rarefied Gas Dynamics. (in printing).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-12-08  

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