Natural Convection In Porous Media Under
Cross Temperature And Concentration Gradients
With Boundary Element Method
Author(s)
J. Kramer, R. Jecl & L. Skerget
Abstract
Double-diffusive natural convection in a horizontal enclosure is studied numerically
with the use of Boundary Element Method. The enclosure is heated and
cooled along vertical walls, while horizontal walls are maintained at different concentration
values. The Brinkman model is used to simulate the fluid flow through
porous media, the density variation is taken into account by the Boussinesq approximation.
The governing parameters of the problem are the Darcy number, porous
Rayleigh number, Lewis number and buoyancy coefficient. Different flow regimes
for thermal and solutal dominated flows are demonstrated for different values of
governing parameters. The results are compared to those in published studies,
obtained with other approximative methods.
Keywords: Boundary Element Method, porous medium, double-diffusive natural
convection, Brinkman model.
1 Introduction
Double-diffusive natural convection in a saturated porous media is of fundamental
importance in many engineering branches e.g. civil engineering, mechanical
engineering, chemical engineering. Several problems in nature or industry can be
modeled as convective flow in enclosure filled with porous media such as underground
spreading of pollutants, geophysical systems, fuel storage installations. In
general two main configurations have been considered in the literature: heat and
mass gradients are imposed horizontally along the enclosure or heat and mass gradients
are imposed vertically along the height of the enclosure. Only few recently
Keywords
Boundary Element Method, porous medium, double-diffusive natural
convection, Brinkman model.
Related Book
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