EFFECT OF MASS-TRANSFER ON A SIMILAR FLOW IN THE MAGNETOHYDRODYNAMIC SQUEEZE FILM

An exact similarity solution has been obtained for the magnetohydrodyn amic squeeze flow between two parallel disks with suction or injection at the porous disk. The disks, at time t are spaced a distance H(1-a lpha t)(1/2) apart and a magnetic field proportional to B-0(1-alpha t )(-1/2) is applied perpendicular to the disks. Approximate analytic s olutions are given and a numerical solution to the resulting nonlinear ordinary differential equation is obtained The effects of magnetic fo rces on the velocity profiles and on the normal forces which the fluid exerts on the disks with suction or injection on the stationary porou s disk are studied. It has been found that the effect of injection is to increase the load carrying capacity and it is the reverse in the ca se of suction.