NUMERICAL ANALYSIS OF THERMAL-FLUID FLOW BETWEEN STATIONARY AND ROTATING PARALLEL DISKS

摘要

This paper investigates thermal-fluid transport phenomena in a laminar flow between a rotating bottom disk and a stationary upper disk, from whose center a circular jet is impinged on the heated horizontal bottom disk surface. Emphasis is placed on the effects of the Reynolds number, rotational velocity, and disk spacing on both the formations of velocity and thermal fields and the heat-transfer rate along the heated wall surface. The governing equations are discretized by means of a control volume technique and are numerically solved to determine the distributions of the velocity vector and fluid temperature under the appropriate boundary conditions. It is found from the study that (ⅰ) the recirculation zone which appears on the stationary disk moves along the outward direction with an increase in the Reynolds number, (ⅱ) when the Reynolds number is increased, heat transfer performance is intensified over the whole disk surface and the minimum value of the heat-transfer rate moves in the downstream direction, and (ⅲ) the heat-transfer rate is induced due to the disk rotation, whose effect becomes larger in the wider disk spacing.