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Diffusion of gases in porous solids: Monte Carlo simulations in the Knudsen and ordinary diffusion regimes
Author(s) -
Abbasi M. H.,
Evans J. W.,
Abramson I. S.
Publication year - 1983
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690290415
Subject(s) - knudsen number , monte carlo method , diffusion , porosity , knudsen diffusion , spheres , porous medium , molecular diffusion , hard spheres , thermodynamics , range (aeronautics) , materials science , chemistry , statistical physics , physics , mathematics , statistics , composite material , metric (unit) , operations management , astronomy , economics
Porous solids have been simulated in the computer as assemblages of spheres. When such assemblages contain spheres distributed in size and randomly arranged in space, the structure of the resulting solid resembles that of a real porous solid. Monte Carlo calculations of gas molecule trajectories through the assemblages were carried out for both the Knudsen and ordinary diffusion régimes. Tortuosities calculated from the simulated diffusion “data” fell in the range obtained experimentally by other investigators. Correlations were obtained that enable the prediction of diffusion rates from measurement of the porosity, mean pore size, and standard deviation of the pore size.