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RECORD NUMBER: 40 OF 73

OLS Field Name OLS Field Data
Main Title Modeling Multicomponent Organic Chemical Transport in Three-Fluid-Phase Porous Media.
Author Kaluarachichi, J. J. ; Parker., J. C. ;
CORP Author Virginia Polytechnic Inst. and State Univ., Blacksburg. Center for Environmental and Hazardous Material Studies.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Publisher c1990
Year Published 1990
Report Number EPA-R-814320; EPA/600/J-90/216;
Stock Number PB91-117465
Additional Subjects Mathematical models ; Fluid flow ; Gas flow ; Liquid flow ; Porous materials ; Soils ; Permeability ; Separation ; Benzene ; Toluene ; Chloropropane ; Trichloroethylene ; Water ; Reprints ; Land pollution ; Environmental transport
Holdings
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Status
NTIS  PB91-117465 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 03/04/1991
Collation 26p
Abstract
A two-dimensional finite-element model was developed to predict coupled transient flow and multicomponent transport of organic chemicals which can partition between NAPL, water, gas and solid phases in porous media under the assumption of local chemical equilibrium. Gas-phase pressure gradients are assumed negligible and liquid flow equations are solved simultaneously using an upstream weighted solution method with time lagged interphase mass-transfer terms and phase densities. Phase-summed component transport equations are solved serially after computation of the velocity field also by an upstream weighted finite-element method. Mass-transfer rates are evaluated from individual phase transport equations by back-substitution and corrected for mass-balance errors. Results of hypothetical simulations of the transport of slightly soluble and volatile organics in three-phase porous media indicate that mass-transfer rate and fluid density updating have negligible effects during periods of highly transient NAPL migration but become important for long-term simulations. Due to low solubilities of environmentally important organic liquids, the efficiency of organic removal by aqueous-phase dissolution and transport can be very slow. Gas-phase diffusion can have a significant influence on the mass transport of organics with large Henry's constant. (Copyright (c) 1990 Elsevier Science Publishers B.V.)