Necessary Condition on the Onset of Double-diffusive Convection in Couple-stress Fluid in Hydromagnetics Saturated by a Porous Medium
نویسندگان
چکیده
In this paper, the effect of magnetic field on double-diffusive convection in couple-stress fluid saturating a porous medium is considered. By applying linear stability theory and normal mode analysis method, a necessary condition is derived which states that the viscoelastic double-diffusive convection at marginal state, cannot manifest as stationary convection if the thermal Rayleigh number R, the medium permeability parameter Pl the couple-stress parameter F, the stable solute gradient S, medium porosity and the Chandrasekhar number Q, satisfy the inequality
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