Title: Entropy generation in double diffusive convection in presence of the Soret effect

Authors: N. Hidouri, M. Magherbi, H. Abbassi, A. Ben Brahim

Addresses: Engineers National School of Gabes, Gabes University, Avenue of Omar Ibn El Khattab, 6029 Gabes, Tunisia. ' High Institute of Applied Sciences and Technology, Gabes University, Avenue of Omar Ibn El Khattab, 6029 Gabes, Tunisia. ' Faculty of Sciences, Sfax University, 3018 Sfax, Tunisia. ' Engineers National School of Gabes, Gabes University, Avenue of Omar Ibn El Khattab, 6029 Gabes, Tunisia.

Abstract: Influence of the Soret effect on entropy generation in a square cavity filled with a binary gas mixture in double diffusive convection is numerically studied. It was found that entropy generation increases with the increase of thermal diffusion and buoyancy ratios for fixed thermal Grashof number. Total irreversibility takes a minimum value at a special buoyancy ratio ranging between –1 and 0. Soret effect causes the increase of total irreversibility by more than 50% at higher values of thermal Grashof number and buoyancy ratio. More details of the irreversibilities localisation are discussed.

Keywords: square cavity; heat transfer; mass transfer; entropy generation; irreversible processes; numerical methods; Soret effect; double diffusive convection; binary gas mixture; thermal diffusion; buoyancy ratios; irreversibilities localisation.

DOI: 10.1504/PCFD.2007.013885

Progress in Computational Fluid Dynamics, An International Journal, 2007 Vol.7 No.5, pp.237 - 246

Published online: 01 Jun 2007 *

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