HR: 1340h
AN: H23A-1422    [Abstracts]
TI: Pore-Scale Study of NAPL Dissolution with a Lattice-Boltzmann Model
AU: * Liu, E B
EM: Elizabeth.Liu@jhu.edu
AF: Johns Hopkins University, Department of Geography and Environmental Engineering, 313 Ames Hall, 3400 North Charles Street, Baltimore, MD 21218 United States
AU: Hilpert, M
EM: Markus_Hilpert@jhu.edu
AF: Johns Hopkins University, Department of Geography and Environmental Engineering, 313 Ames Hall, 3400 North Charles Street, Baltimore, MD 21218 United States
AB: In recent years, Lattice Boltzmann (LB) modeling has emerged as a powerful numerical scheme for simulating multiphase fluid flows. The LB method is based on a quasi-molecular approach in which the movement of particles is tracked on a lattice. This method allows simulating various transport processes in the complex pore geometries that are typical for subsurface systems in a straightforward manner. A multicomponent-multiphase LB model was used to simulate NAPL dissolution in porous media in two and three dimensions. By applying the Chapman-Enskog expansion, diffusion coefficients for a two fluid phase system were derived. Using experimental values obtained from a tetrachloroethylene (PCE) and water system, the model was first calibrated by simulating a NAPL blob dissolving into an aqueous phase. Results from this test satisfy the Young-Laplace equation. Next, we simulate the dissolution of a NAPL blob in the presence of a flowing aqueous phase. For the two dimensional model, mass transfer rates of a NAPL blob agree well with empirical relations. By varying the Peclet and Reynolds numbers in these simulations, we were able to derive mass-transfer correlations for NAPL dissolution. We then simulated NAPL dissolution in a two-dimensional porous medium system. Results of these simulations will also be presented.
DE: 0515 Cellular automata
DE: 0792 Contaminants (0432)
DE: 1831 Groundwater quality
DE: 1832 Groundwater transport
DE: 1847 Modeling
SC: Hydrology [H]
MN: Fall Meeting 2005