An Official Journal of the American Society of Thermal and Fluids Engineers

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Effects of Viscous Dissipation and Joule Heating on Thermal Instability of Natural Convection Flow in a Boundary Layer Flow Subjected to Magnetic Field

RESUMO

Effects of viscous dissipation and Joule heating on the thermal instability in natural convection over a heated horizontal plate subjected external magnetic field are studied. The criterion on the position marking on the onset of longitudinal vortices is defined in this paper. The results show that the onset position characterized by the Grashof number depends on the Prandtl number, the wave number, the Eckert number, and the magnetic field parameter. The flow is found more stable as the magnetic field increases. However, the destabilizing effect is found when the Eckert number increases. The results of the present numerical prediction show reasonable agreement with the experimental data in the case of zero magnetic field parameter in the literature.