Interdiffusion of Gases in a Low-Permeability Graphite. II. Influence of Pressure Gradients

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Abstract
A previous experimental investigation of the interdiffusion behavior of two unlike gases within a porous medium at uniform pressure has been extended. The extended studies were focused on interdiffusion under the influence of pressure gradients which, in turn, give rise to both viscous and diffusive components of the experimentally determined fluxes. The fact that the diffusion processes investigated occurred within the region bounded by the normal and Knudsen regimes (the transition region), constituted one of the most important features of these studies. The experimentally observed flux phenomena could be readily explained within the framework of a ``dust‐gas'' model. The flux equations exhibited only one major weakness and this involved the absence of viscous flow contributions resulting from the pressure gradients. However, it was possible to use these and related equations and, with associated parameters, to reconstruct the experimental curves via computations. It was found that the range of applicability of the equations was limited and that none of the parameters could be predicted beforehand. This was partially the result of the internal‐pore geometry of the graphite. Nevertheless, the applicability of the existing dust‐gas equations to nonuniform pressure conditions has been established for the transition region insofar as is possible with a medium such as graphite.

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