Relaxation of a Free-Molecular Gas to Equilibrium Caused by Interaction with Vessel Wall

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Abstract

A free-molecular gas contained in a static vessel with a uniform temperature is considered. The approach of the velocity distribution function of the gas molecules from a given initial distribution to the uniform equilibrium state at rest is investigated numerically under the diffuse reflection boundary condition. This relaxation is caused by the interaction of gas molecules with the vessel wall. It is shown that, for a spherical vessel, the velocity distribution function approaches the final uniform equilibrium distribution in such a way that their difference decreases in proportion to an inverse power of time. This is slower than the known result for a rarefied gas with molecular collisions.

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Details 詳細情報について

  • CRID
    1050282677277732864
  • NII Article ID
    120002426865
  • NII Book ID
    AA00707889
  • ISSN
    00224715
  • HANDLE
    2433/126618
  • Text Lang
    en
  • Article Type
    journal article
  • Data Source
    • IRDB
    • CiNii Articles

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