Interdiffusion of Helium and Argon in a Large-Pore Graphite.

Modelling of multi-component gas flows in capillaries and porous solids

“…For clarification and validation purposes, CPIM calculations have been compared with the extensive experimental data of helium-argon counter-diffusion obtained by Evans et al [29][30][31]. As shown in Figs.…”

“…It is interesting to note that, for given R, Dp and DX 1 , Eq. (39) predicts that the absolute fluxes are proportional to e/s 2 L. This procedure can be illustrated by reference to the experimental measurements of helium-argon counterdiffusion performed by Evans et al [29][30][31]. The first paper describes flow measurements in Ôspecimen BÕ which was a porous graphite material with high permeability and large pore size, while the second and third papers describe experiments in Ôspecimen AÕ which was also graphite but had a much lower permeability and smaller pore size.…”

“…The experimental results for specimen B are presented in Evans et al [29] but the data are much less Tables I and II of the paper but there are only 4 tests with non-zero Dp. CPIM calculations for these tests using Eqs.…”

Gaseous counterdiffusion in catalyst pellets

“…The method may be called steady counterdifwion. Early measurements of this type were made by Buckingham ( 3 ) on porous soils; more recent measurements on adsorbents, catalysts, and other synthetic porous media inc!ude those of Wicke and Kallenbach ( 2 9 ) , Weisz ( 2 6 ) , Dubik ( 7 ) , Roiter and Korneichuk ( 1 7), Hoogschagen ( 1 3 ) , Scott and Cox ( 2 0 ) , Henry and co-workers ( 1 2 ) , Scott and DulIien ( 2 2 ) , and Evans and co-workers (8).…”

“…The present work sought to clarify this issue by measuring both fluxes over a range of total pressures A.1.Ch.E. Journal (8) SufFiciently broad to cover the intermediate range.…”