Abstract
Exact analytical methods are applied to description of the thermal and isothermal slip of a molecular gas along a hard spherical surface with a relatively small curvature. The thermal and isothermal slip coefficients of the gas are determined in an approximation linear with respect to the Knudsen number. The problem is solved within the framework of the generalized Bhatnagar-Gross-Kruck (BGK) model of the Boltzmann kinetic equation taking into account the rotational degrees of freedom. The values of the thermal and isothermal slip coefficients have been numerically calculated for several molecular gases. It is shown that the obtained slip coefficients depend on the Prandtl number.
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