Thermal Instability of the Couple-Stress on Micro Polar Fluid Flow

Effect of the couple-stress on micro polar fluid layer heated from below in a porous medium is studied. The dispersion relation was obtained using the normal mode and the problem has been numerically analyzed by MATLAB. The effect of permeability, couple-stress parameter, magnetic field and micro-polar parameters have been obtained and the effect of magnetic field on the system is very important result. The condition of over stability is also obtained.