Flow and diffusion of gases through porous substrates

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Abstract
An experimental study of simultaneous flow and binary diffusion through four porous catalyst substrates was conducted in the range of pressure from 1 to 3 bar absolute. Experiments on the flow of pure gases and isobaric binary diffusion were carried out on the same catalyst substrates. The differential equations describing simultaneous flow and diffusion in the form of the Chapman‐Enskog first‐order approximations were solved analytically, taking into account the variation of viscosity with composition. The parameters for the diffusion and flow processes were found from separate experiments on flow and diffusion, from experiments on nonisobaric flow and diffusion, and from composition transients in fixed beds. There was good agreement between theory and experiment except for permeability experiments at low pressures, where significant differences were found.

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