Spherical Source Flow Expansion of Single Monatomic Gases into Vacuum
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概要
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The source flow expansion of single monatomic gases into a vacuum is studied on the basis of the B-G-K kinetic equation. The analysis is made by means of a numerical method proposed, in combining the discrete ordinate method. The actual calculations are carried out covering a spatial region from the isentropic upstream to the far downstream over a wide range of the Knudsen numbers, for both hard sphere and Maxwell molecules. It is found that in the far downstream the velocity distribution function is of asymmetric with respect to the radial velocity. The results for the macroscopic quantities are compared with the results of previous treatments, and found to be in a reasonable agreement with the numerical experiment by means of the Monte-Carlo method.
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