Thermosolutal Instability of Couple Stress Rivlin Ericksen Ferromagnetic Fluid with Rotation, Magnetic and Variable Gravity Field in Porous Medium

Abstract

In this paper thermosolutal instability of a couple stress Rivlin-Ericksen ferromagnetic fluid layerwith rotation, magnetic and variable  gravity field in porous medium is studied. Using normal mode analysis technique the dispersion relation has been obtained and solved analytically. For stationary convention, it is found that couple stress, magnetic field and permeability of medium have stabilizing effect on thermal instability under certain conditions. Rotation has stabilizing effect if λ> 0 and destabilizing effect if λ< 0. Solute gradients has stabilizing effect either λ > 0 or λ < 0. The presence of solute gradient, viscoelastic parameter, rotation and magnetic field introduces oscillatory modes, stability in the system and principle of exchange of stability is not satisfied if λ < 0 and system may be stable or unstable if λ > 0.