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Effect of rotational degrees of freedom of molecules on energy flux in attenuated gas

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Abstract

On the basis of model kinetic equations a solution is obtained by a numerical method for the flow of attenuated gas around a sphere. The effect of rotational degrees of freedom on the energy flux to the body is investigated. Values of the ratio between the energy flux Q and its free-molecular value Q* for monatomic and diatomic gases are compared; for the comparison, the dimensionless temperature of the body, the gas velocity at infinity, and the law of viscosity must be the same in the two cases. For sufficiently cold bodies (when the body temperature is below the equilibrium temperature for a diatomic gas) the difference between Q/Q* for monatomic and diatomic gases is insignificant. For a diatomic gas when the body temperature is close to equilibrium, the ratio Q/Q* is found to have a nonmonotonic dependence on the Knudsen force.

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Literature cited

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Authors and Affiliations

  1. Moscow

    I. N. Larina & V. A. Rykov

Authors
  1. I. N. Larina
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  2. V. A. Rykov
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Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 5, pp. 119–124, September–October, 1977.

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Larina, I.N., Rykov, V.A. Effect of rotational degrees of freedom of molecules on energy flux in attenuated gas. Fluid Dyn 12, 739–743 (1977). https://doi.org/10.1007/BF01050489

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  • DOI: https://doi.org/10.1007/BF01050489

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