Turbulent Heat Transfer in Corotating Annular Disks

Abstract

This paper deals with heat transfer in turbulent flow through corotating annular disks. The dual-stream flow influx enters from both sides and proceeds radially outward. The governing equations are solved by a finite-difference technique using a modified SIMPLER algorithm. The effects of the disk size and spacing, influx Reynolds number, and rotational speed on the heat transfer performance are investigated. It is concluded that disk rotation produces a surge in local Nusselt number at the near-exit region and a substantial enhancement in the average heat transfer performance. Optimum enhancement may be achieved by using a smaller unit with stationary disks operating at high Reynolds numbers or a larger unit with rotating disks operating at lower Reynolds numbers