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Title: Estimation of effective diffusivity in drying of heterogeneous porous media

Abstract

This work presents a new method to evaluate the effective diffusivity in porous solids, considering the mass-transfer mechanisms occurring in the pores and on the surface. The binary friction model was used to evaluate the effective gas-phase diffusivity and the Maxwell-Stefan surface diffusion equation to the transport of bound water. Different expressions for the effective diffusivity for porous solids were derived considering parallel diffusion, series diffusion, and the Clausius-Mossotti model. The numerical results were compared to experimental data obtained for Son clay. In the pore diffusivity, when both are present, capillary flow showed dominance over gas diffusion. For the entire moisture content range, only a combination of the models presented good agreement with experimental data, showing changes in the interdependence of mechanisms during the drying process.

Authors:
; ;
Publication Date:
Research Org.:
Lab. of Separation Processes and Transport Phenomena-TUE, Eindhoven (NL)
OSTI Identifier:
20076084
Resource Type:
Journal Article
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 39; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0888-5885
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; POROUS MATERIALS; DRYING; MOISTURE; DIFFUSION; MATHEMATICAL MODELS; CLAYS; CAPILLARY FLOW; FLUID FLOW

Citation Formats

Silva, M.A., Kerkhof, P.J.A.M., and Coumans, W.J. Estimation of effective diffusivity in drying of heterogeneous porous media. United States: N. p., 2000. Web. doi:10.1021/ie990563n.
Silva, M.A., Kerkhof, P.J.A.M., & Coumans, W.J. Estimation of effective diffusivity in drying of heterogeneous porous media. United States. doi:10.1021/ie990563n.
Silva, M.A., Kerkhof, P.J.A.M., and Coumans, W.J. Mon . "Estimation of effective diffusivity in drying of heterogeneous porous media". United States. doi:10.1021/ie990563n.
@article{osti_20076084,
title = {Estimation of effective diffusivity in drying of heterogeneous porous media},
author = {Silva, M.A. and Kerkhof, P.J.A.M. and Coumans, W.J.},
abstractNote = {This work presents a new method to evaluate the effective diffusivity in porous solids, considering the mass-transfer mechanisms occurring in the pores and on the surface. The binary friction model was used to evaluate the effective gas-phase diffusivity and the Maxwell-Stefan surface diffusion equation to the transport of bound water. Different expressions for the effective diffusivity for porous solids were derived considering parallel diffusion, series diffusion, and the Clausius-Mossotti model. The numerical results were compared to experimental data obtained for Son clay. In the pore diffusivity, when both are present, capillary flow showed dominance over gas diffusion. For the entire moisture content range, only a combination of the models presented good agreement with experimental data, showing changes in the interdependence of mechanisms during the drying process.},
doi = {10.1021/ie990563n},
journal = {Industrial and Engineering Chemistry Research},
issn = {0888-5885},
number = 5,
volume = 39,
place = {United States},
year = {2000},
month = {5}
}