Monte Carlo simulation of diffusion of gases in a porous solid: Calculations for a new class of solids

In a previous paper, a Monte Carlo simulation of the Knudsen diffusion of a gas in a porous solid was carried out. The simulated porous solid had pore walls that were convex. In the present paper, the simulation is repeated using simulated solids whose pore walls are concave. It was found that the results of both studies could be correlated by a single equation. This equation enables the prediction of the Knudsen diffusiveness from the porosity and mean pore size without resort to a tortuosity factor.