© Hindawi Publishing Corp. UNSTEADY FLOW INDUCED BY VARIABLE SUCTION ON A POROUS DISK ROTATING ECCENTRICALLY WITH A FLUID AT INFINITY

We study the effect of variable suction or blowing on the flow of an incompressible viscous fluid due to noncoaxial rotations of a porous disk and a fluid at infinity. The inquiries are made about the components of fluid velocity and the shear stress at the disk. It is found that the effect of uniform suction or blowing on the flow is enhanced in the presence of variable suction or blowing. 2000 Mathematics Subject Classification: 76S05. 1. Introduction. Thornley [5] has studied the unsteady flow developed in an in-compressible viscous fluid due to nontorsional oscillations of an infinite rigid plate when both the fluid and the plate are in a state of solid body rotation. A similar prob-lem of magnetohydrodynamic Ekman layer over an infinite rigid nonconducting plate was examined by Gupta [3]. On the other hand, the flow due to noncoaxial rotation