Abstract
ABSTRACT A new approach to the description of mass transfer for the statistic model of a porous body on the basis of the methods of the kinetic theory of gases is suggested. The collision integral in the one-dimensional kinetic equation is replaced by a term with the effective“external” force, which is the result of the collective interaction of gas molecules with the motionless particles. The cases of evaporation from a recessed boundary and gas filtration in a porous layer are considered. Simple expressions for the permeability coefficient and pressure jump (output resistance) at the gas-porous medium boundary in the dependence of Kn number are obtained. Theoretical and experimental data are compared.
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