Gradient Driven Flow: Lattice Gas, Diffusion Equation and Measurement Scales

Document Type

Article

Publication Date

2-1-2001

Department

Physics and Astronomy

School

Mathematics and Natural Sciences

Abstract

Tracer diffusion and fluid transport are studied in a model for a geomarine system in which fluid constituents move from regions of high to low concentration. An interacting lattice gas is used to model the system. Collective diffusion of fluid particles in lattice gas is consistent with the solution of the continuum diffusion equation for the concentration profile. Comparison of these results validates the applicability and provides a calibration for arbitrary (time and length) units of the lattice gas. Unlike diffusive motion in an unsteady-state regime, both fluid and tracer exhibit a drift-like transport in a steady-state regime. The transverse components of fluid and tracer displacements differ significantly. While the average tracer motion becomes nondiffusive in the long time regime, the collective motion exhibits an onset of oscillation.

Publication Title

International Journal of Modern Physics C

Volume

12

Issue

2

First Page

273

Last Page

279

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