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Effect of an External Oriented Magnetic Field on Entropy Generation in Natural Convection
Chemical and Processes Engineering Department, Engineers National School of Gabès, Omar Ibn El Khattab Street, 6029 Gabès, Tunisia
Civil Engineering Department, High Institute of Applied Sciences and Technology, Omar Ibn El Khattab Street, 6029 Gabès, Tunisia
* Author to whom correspondence should be addressed.
Received: 28 April 2010; Accepted: 28 May 2010 / Published: 28 May 2010
Abstract: The influence of an external oriented magnetic field on entropy generation in natural convection for air and liquid gallium is numerically studied in steady-unsteady states by solving the mass, the momentum and the energy conservation equations. Entropy generation depends on five parameters which are: the Prandtl number, the irreversibility coefficients, the inclination angle of the magnetic field, the thermal Grashof and the Hartmann numbers. Effects of these parameters on total and local irreversibilities as well as on heat transfer and fluid flow are studied. It was found that the magnetic field tends to decrease the convection currents, the heat transfer and entropy generation inside the enclosure. Influence of inclination angle of the magnetic field on local irreversibility is then studied.
Keywords: heat transfer; convection; magnetic field; cavity; entropy generation; numerical methods
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MDPI and ACS Style
El Jery, A.; Hidouri, N.; Magherbi, M.; Brahim, A.B. Effect of an External Oriented Magnetic Field on Entropy Generation in Natural Convection. Entropy 2010, 12, 1391-1417.
El Jery A, Hidouri N, Magherbi M, Brahim AB. Effect of an External Oriented Magnetic Field on Entropy Generation in Natural Convection. Entropy. 2010; 12(6):1391-1417.
El Jery, Atef; Hidouri, Nejib; Magherbi, Mourad; Brahim, Ammar Ben. 2010. "Effect of an External Oriented Magnetic Field on Entropy Generation in Natural Convection." Entropy 12, no. 6: 1391-1417.