Kinetic Phenomena in the Diffusion of Gases in Capillaries and Porous Bodies

Abstract

The flow of gases and gaseous mixtures in capillaries and porous bodies were considered. Phenomenological transfer equations were derived using methods of non-equilibrium thermodynamics. Integral and local equations of non-equilibrium thermodynamics were constructed and phenomenological relations of two types were obtained. Different approaches to the calculation of kinetic coefficients were indicated. Methods of kinetic theory based on Boltzmann's equation and the dusty gas model were analyzed separately. Results of the calculations of kinetic coefficients for small and large Knudsen numbers were reported with allowance for incomplete accommodation of molecules on the surface of channel walls. A number of kinetic effects exhibiting during the flow of gases and gaseous mixtures through the capillaries and porous bodies was discussed.