JP Journal of Heat and Mass Transfer
Volume 3, Issue 2, Pages 147 - 166
(June 2009)
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MAGNETIC FIELD EFFECTS ON THE FLOW PATTERNS AND THE ENTROPY GENERATION OF NATURAL CONVECTION IN SQUARE CAVITY
Mourad Magherbi (Tunisia), Atef El Jery (Tunisia) and Ammar Ben Brahim (Tunisia)
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The effects of Hartmann number and
the magnetic field inclination angle are presented graphically in terms of
isotherm and streamline plots. The effect of the magnetic field is found to
suppress the convection currents and heat transfer inside the
cavity. This effect is significant for high Grashof numbers. Results show
that the Nusselt number is clearly affected by the magnetic field. The effect of
the Hartmann number on entropy generation was investigated in steady-unsteady
state of natural convection. It was found
that entropy generation in the steady state decreases when Hartmann number
increases. Additionally, the oscillatory behavior
of the entropy generation at the onset of natural convection can be
suppressed at critical Hartmann number.