Tangential Flow and Heat Transfer of Power Law Fluids in an Annulus Between Two Rotating Cylinders With Suction and Injection

Abstract

The steady state tangential flow and heat transfer of a power-law fluid in an annulus between two rotating coaxial porous cylinders in presence of presence of suction and injection has been considered in this paper. The effect of suction and injection on the flow field has been investigated. The heat transfer is considered in two cases: (i) the inner wall is thermally insulated and outer wall is maintained at a fixed temperature; (ii) both the walls are maintained at fixed different temperatures, including the case when both the walls are at equal temperature. In the first case it has been found that the temperature increases with Brinkmans's number Br or flow behaviour index n and Br acts as a scale factor. In the second case the temperature increases with the increase of Br or n and decreases with increase of Peclet number (Pe'). In the second case the Nusselt number at the cylinders have been calculated.