Abstract
The dusty-gas model is employed to obtain expressions for the flow of a dissociating gas (in local chemical equilibrium) through a porous medium, or a capillary tube. The resulting equations can be expressed in a manner that is formally similar to those for the flow of a single nonreacting gas, but with a viscous term involving a dependence of viscosity on pressure, and a diffusive term which involves not only Knudsen diffusion coefficients but also the binary mutual diffusion coefficient D1v for interdiffusion of dissociated and associated species.For an isomerizing gas, however, these complications virtually disappear. The equilibrium composition, and therefore the viscosity, no longer varies with pressure; and the dependence on the binary mutual diffusion coefficient (to a good approximation) is removed by a cancellation of terms.The effect of flow in an adsorbed layer is considered.
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