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1 International Journal of Applied Mechanics and Engineering

1 2006

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Effect of temperature-dependent viscosity on ferroconvection in a porous medium

Ramanathan A., Muchikel N.

International Journal of Applied Mechanics and Engineering

2006

Vol. 11, no 1

93-104

The effect of temperature-dependent viscosity on the threshold of ferroconvective instability in a porous medium is studied using the Brinkman model. It is found that the stationary mode of instability is preferred to the oscillatory mode. The critical values of the magnetic Rayleigh number marking the onset of ferroconvection are obtained using the Galerkin technique. It is found that the effect of magnetization is to destabilize the system and so is the effect of temperature-dependent viscosity. The porous medium is found to have a stabilizing influence on the onset of convection. The problem is important in energy conversion devices involving ferromagnetic fluids as working media.