Unsteady MHD flow of a non-Newtonian fluid due to eccentric rotations of aporous disk and a fluid at infinity

An exact solution of the unsteady flow of a second-order fluid due to non-c oaxial rotations of a porous disk and a fluid at infinity in the presence o f a uniform transverse magnetic field is investigated. It is once again sho wn that for uniform suction or uniform injection at the disk an asymptotic profile exists for the velocity distribution. The effects of the magnetic f ield, the material parameters of the second-order fluid, suction and inject ion on the velocity distribution are studied. Further, from the solution of a rigid disk, it is found that for parameter beta >.01, a non-Newtonian ef fect is present in the velocity field. However, for beta <.01 the velocity field becomes a Newtonian one.