Open Access

ARTICLE

Numerical Simulation of Thermosolutal Convective Transitions in a Very Narrow Porous Annulus under the Influence of Lewis Number

A. Ja¹, A. Cheddadi¹

1 Research Team "Thermal Systems and Real Flows", Mohammadia School of Engineers, Mohammed V University in Rabat, Morocco.

Fluid Dynamics & Materials Processing 2017, 13(4), 235-249. https://doi.org/10.3970/fdmp.2017.013.235

Abstract

This paper reports on the natural convection within a very narrow horizontal annular cavity filled with a porous medium saturated by a binary fluid. The main objective of this study is the identification of the effect of Lewis number on the flow structure and on the heat and mass transfer rates, in a cavity of very small radius ratio R=1.05, in the case of equal buoyancy forces (N=1), for a Rayleigh number Ra=50. The dimensionless governing equations were solved by the centered Finite Difference method using the ADI scheme. Several multicellular flows appear during the variation of the Lewis number, resulting in a direct impact on the heat and solutal transfer rates.

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