Flow and Diffusion of Gases in Porous Media

A generalized treatment of gas transport in porous media is presented as developed on the basis of the ``dusty‐gas'' model, a model in which a porous medium is described as consisting of uniformly distributed, giant molecules (dust) held stationary in space. The problem is broken down into a series of special cases which involve the various combinations of gradients in composition, pressure, and temperature.Equations are given for the description of several well‐known phenomena. These include isobaric, isothermal diffusion; diffusion under the influence of a pressure gradient; Poiseuille's flow equation, including the Knudsen minimum; the Kramers—Kistemaker effect; thermal transpiration; and the effect of pressure on the thermal‐diffusion factor. The results are likewise applicable to capillaries by a suitable substitution for geometric parameters.

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