MHD oscillatory motion of Rivlin-Erickson fluid between two co-axial circular cylinders through porous medium

This problem is concerned with the magnetohydrodynamic oscillatory motion of Rivlin-Erickson fluid between two co-axial circular cylinders both which execute longitudinal oscillation in their own plane. The amplitudes of the frequency have been taken different for the cylinders. The effect of porosity of medium on velocity is obtained and discussed. (author)