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Title: Coupled transport processes in semipermeable media

Abstract

A numerical simulator has been developed to investigate the effects of coupled processes on heat and mass transport in semipermeable media. The governing equations on which the simulator is based were derived using the thermodynamics of irreversible processes. The equations are nonlinear and have been solved numerically using the n-dimensional Newton's method. As an example of an application, the numerical simulator has been used to investigate heat and solute transport in the vicinity of a heat source buried in a saturated clay-like medium, in part to study solute transport in bentonite packing material surrounding a nuclear waste canister. The coupled processes considered were thermal filtration, thermal osmosis, chemical osmosis and ultrafiltration. In the simulations, heat transport by coupled processes was negligible compared to heat conduction, but pressure and solute migration were affected. Solute migration was retarded relative to the uncoupled case when only chemical osmosis was considered. When both chemical osmosis and thermal osmosis were included, solute migration was enhanced. 18 refs., 20 figs.

Authors:
;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
DOE/ER
OSTI Identifier:
6400480
Report Number(s):
LBL-25619
ON: DE91004140
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; POROUS MATERIALS; HEAT TRANSFER; MASS TRANSFER; BOUNDARY CONDITIONS; COMPUTERIZED SIMULATION; EQUATIONS; IRREVERSIBLE PROCESSES; NONLINEAR PROBLEMS; NUMERICAL SOLUTION; OSMOSIS; PERMEABILITY; PRESSURE GRADIENTS; RADIOACTIVE WASTE STORAGE; TEMPERATURE DISTRIBUTION; DIFFUSION; ENERGY TRANSFER; MANAGEMENT; MATERIALS; SIMULATION; STORAGE; WASTE MANAGEMENT; WASTE STORAGE; Geothermal Legacy; 152002* - Geothermal Data & Theory- Properties of Minerals & Rocks; 990200 - Mathematics & Computers; 154000 - Geothermal Energy- Waste Management- (1990-)

Citation Formats

Jacobsen, J S, and Carnahan, C L. Coupled transport processes in semipermeable media. United States: N. p., 1990. Web. doi:10.2172/6400480.
Jacobsen, J S, & Carnahan, C L. Coupled transport processes in semipermeable media. United States. https://doi.org/10.2172/6400480
Jacobsen, J S, and Carnahan, C L. 1990. "Coupled transport processes in semipermeable media". United States. https://doi.org/10.2172/6400480. https://www.osti.gov/servlets/purl/6400480.
@article{osti_6400480,
title = {Coupled transport processes in semipermeable media},
author = {Jacobsen, J S and Carnahan, C L},
abstractNote = {A numerical simulator has been developed to investigate the effects of coupled processes on heat and mass transport in semipermeable media. The governing equations on which the simulator is based were derived using the thermodynamics of irreversible processes. The equations are nonlinear and have been solved numerically using the n-dimensional Newton's method. As an example of an application, the numerical simulator has been used to investigate heat and solute transport in the vicinity of a heat source buried in a saturated clay-like medium, in part to study solute transport in bentonite packing material surrounding a nuclear waste canister. The coupled processes considered were thermal filtration, thermal osmosis, chemical osmosis and ultrafiltration. In the simulations, heat transport by coupled processes was negligible compared to heat conduction, but pressure and solute migration were affected. Solute migration was retarded relative to the uncoupled case when only chemical osmosis was considered. When both chemical osmosis and thermal osmosis were included, solute migration was enhanced. 18 refs., 20 figs.},
doi = {10.2172/6400480},
url = {https://www.osti.gov/biblio/6400480}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Apr 01 00:00:00 EST 1990},
month = {Sun Apr 01 00:00:00 EST 1990}
}