Title: Influence of Soret and Dufour effects on entropy generation in transient double diffusive convection

Authors: N. Hidouri, A. Ben Brahim

Addresses: Chemical and Processes Engineering Department, Engineers National School, Gabes University, Omar Ibn El Khattab Street, 6029 Gabes, Tunisia. ' Chemical and Processes Engineering Department, Engineers National School, Gabes University, Omar Ibn El Khattab Street, 6029 Gabes, Tunisia

Abstract: The influence of Soret and Dufour effects on entropy generation in transient double diffusive convection of a binary gas mixture for the special case of opposing buoyancy forces with equal intensity is numerically studied. It is an interesting case since it corresponds to minimum entropy generation. For moderate thermal Grashof number (Gr_T = 10⁴), Soret and Dufour parameters induce a slight increase of entropy generation, for relatively higher thermal Grashof number (Gr_T = 5 × 10⁴), oscillatory behaviour of entropy generation is obtained. Contributions of Soret and Dufour effects on entropy generation, on heat and mass transfer are discussed.

Keywords: double diffusive convection; entropy generation; numerical methods; Soret effect; Dufour effect; binary gas mixtures; buoyancy forces; heat transfer; mass transfer.

DOI: 10.1504/IJEX.2010.033414

International Journal of Exergy, 2010 Vol.7 No.4, pp.454 - 481

Received: 13 Aug 2008
Accepted: 16 May 2009
Published online: 02 Jun 2010 *

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