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ENTROPY GENERATION IN NATURAL CONVECTION UNDER AN EVANESCENT MAGNETIC FIELD

DOI: 10.1615/ICHMT.2009.CONV.620
9 pages

Mourad Magherbi
Chemical and Process Engineering Department, Engineers National School of Gabes, Gabes University, Applied Thermodynamics Unit, Omar Ibn El Khattab St., 6029 Gabes, Tunisia

Atef El Jery
National School of Engineers of Gabes, Omar Ibn El Khattab Street, 6029 Gabes, TUNISIA

Ammar Ben Brahim
Ecole Nationale d’Ingénieurs de Gabès, Rue Omar Ibn El Khattab, 6029 Gabès, Tunisia, Département de Génie Chimique Procédés, Unité de Recherche : Thermodynamique Appliquée

Résumé

We numerically study the effect of an externally-evanescent magnetic field on total entropy generation in conducting and non-reactive fluid enclosed in a square cavity. The horizontal walls of the enclosure are assumed to be insulated while the vertical walls are kept isothermal. A control volume finite element method is used to solve the conservation equations at Prandtl number of 0.71. The values of relaxation time of the magnetic field are chosen, so that the Lorentz force acts only in the transient state of entropy generation in natural convection. The total entropy generation was calculated for fixed value of irreversibility distribution ratio, different relaxation time varying from 0 to 1/5 and Grashof number equal to 105.

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