Modeling multicomponent reactive chemical transport in nonisothermal unsaturated/saturated soils. 1. Mathematical model development
1995
Wu, G. | Chieng, S.T.
A set of coupled equations has been developed to describe the simultaneous transport of water, heat, and multicomponent reactive chemicals in saturated/unsaturated subsurface soils. The water movement equation takes into account vapor transport in the unsaturated zone, as well as the fluxes caused by the gradients of temperature and solute concentrations. The heat transfer equation includes the components of heat conduction and latent heat transfer. A phase conversion factor is used to simplify the heat transfer equation, as introduced by Luikov (1966). The chemical transport equations are formulated in terms of the total analytic concentrations of all aqueous components. These equations are identical in form and can be solved one by one to save computer CPU storage. Chemical reactions which can be dealt with in this model include complexation, acid base reaction, ion exchange, and precipitation-dissolution.
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