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Source flow expansion of monatomic gas into vacuum under external field of forces

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Abstract

The steady flow expansions of monatomic gases consisting of Maxwellia molecules into a vacuum moving under external forces with a source of spherical symmetry are investigated. The analysis is based on the B-G-K model of the Boltzmann equation with the approximation in hypersonic limit. The kinetic equation is solved by using the moment method. Analytical forms for the density and temperature are obtained for small and large distances from the source. The results show that the temperature in free expansion is less than that in the case of the expansion under the influence of external field of forces.

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Authors and Affiliations

  1. Faculty of Science, Ain Shams University, Egypt

    A. G. El.-Sakka

  2. Faculty of Science, Zagazig University, Egypt

    S. A. Montasser

Authors
  1. A. G. El.-Sakka
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  2. S. A. Montasser
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El.-Sakka, A.G., Montasser, S.A. Source flow expansion of monatomic gas into vacuum under external field of forces. Astrophys Space Sci 113, 249–256 (1985). https://doi.org/10.1007/BF00650960

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  • DOI: https://doi.org/10.1007/BF00650960

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