UNSTEADY-FLOW AND HEAT-TRANSFER BETWEEN ROTATING COAXIAL DISKS

A study is made on the flow and heat transfer of a viscous fluid confi ned between two parallel disks. The disks are allowed to rotate with d ifferent time dependent angular velocities, and the upper disk is made to approach the lower one with a constant speed. Numerical solutions of the governing parabolic partial differential equations are obtained through a fourth-order accurate compact finite difference scheme. The normal forces and torques that the fluid exerts on the rotating surfa ces are obtained at different nondimensional times for different value s of the rate of squeezing and disk angular velocities. The temperatur e distribution and heat transfer are also investigated in the present analysis.