Document Detail

Supercritical fluids in porous composite materials: direction-dependent flow properties.
MedLine Citation:
PMID:  16605656     Owner:  NLM     Status:  PubMed-not-MEDLINE    
The results of extensive nonequilibrium molecular dynamics simulations of flow and transport of a pure fluid, as well as a binary fluid mixture, through a porous material composed of a macropore, a mesopore, and a nanopore, in the presence of an external pressure gradient, are reported. We find that under supercritical conditions, unusual phenomena occur that give rise to direction-dependent and pressure-dependent permeabilities for the fluids' components. The results, which are also in agreement with a continuum formulation of the problem, indicate that the composite nature of the material, coupled with condensation, give rise to the direction-dependent permeabilities. Therefore, modeling flow and transport of fluids, in the supercritical regime, in porous materials with the type of morphology considered in this paper (such as supported porous membranes) would require using effective permeabilities that depend on both the external pressure drop and the direction along which it is applied to the materials.
Mahnaz Firouzi; Muhammad Sahimi; Theodore T Tsotsis
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Publication Detail:
Type:  Journal Article     Date:  2006-03-24
Journal Detail:
Title:  Physical review. E, Statistical, nonlinear, and soft matter physics     Volume:  73     ISSN:  1539-3755     ISO Abbreviation:  Phys Rev E Stat Nonlin Soft Matter Phys     Publication Date:  2006 Mar 
Date Detail:
Created Date:  2006-04-11     Completed Date:  2006-08-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101136452     Medline TA:  Phys Rev E Stat Nonlin Soft Matter Phys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  036312     Citation Subset:  -    
Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089-1211, USA.
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