Resumen

RANA, G.C  y  THAKUR, R.C. Necessary condition on the onset of double-diffusive convection in couple-stress fluid in hydromagnetics saturated by a porous medium. Lat. Am. appl. res. [online]. 2013, vol.43, n.4, pp. 307-311. ISSN 1851-8796.

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 P_l the couple-stress parameter F, the stable solute gradient S, medium porosity e and the Chandrasekhar number Q, satisfy the inequality the result clearly established the stabilizing character of couple-stress parameter, stable solute gradient and magnetic field whereas destabilizing character of medium permeability and porosity

Palabras llave : Couple-Stress Fluid; Double-diffusive Convection; Magnetic Field; Porous Medium.