Numerical Simulation of Hydrodynamic Dispersion in Random Porous Media.
Numerical Simulation of Hydrodynamic Dispersion in
Random Porous Media.
(737 K)
Martys, N. S.
Journal of Chromatography A, Vol. 707, 35-43, 1995.
Keywords:
building technology; hydrodynamic dispersion; porous
media; diffusion; convection; conductivity;
chromatography
Abstract:
In this paper we present results demonstrating the
utility of computational methods to numerically simulate
and visualize hydrodynamic dispersion in random porous
media. The role of Peclet number in the spread of a dye
through porous media is illustrated. From examination
of concentraion profiles, effective diffusion
coefficients were numerically determined for different
Peclet numbers. In contrast to the case of fluid-driven
dispersion, we discuss the spread of a dilute
concentration of ions driven by an electric field. We
also consider a simple model of size exclusion
chromatography where materials that advect and diffuse
through pore space also diffuse through the solid
matrix.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899