Experimental Study on Cooling of a Disk by Impinging Jet of Water

Abstract

An experimental study was made to discuss an unsteady heat transfer composed of two steps of the conduction in a disk and the forced convection between an impinging jet of water and the disk.
Temperature changes with time at two points in the disk depended upon its dimensions, diameter of a cylindrical nozzle and average velocity of water in the nozzle. The heat flux in the vertical direction at the interface between the fluid and the disk depended upon the local radius of the disk.
These experimental results were expressed by a heat-transfer model combined with the steady convection and the unsteady conduction. An empirical equation of the heat-transfer coefficient based on the model was presented. However, further study of the steady convection is necessary, because the heat-transfer mechanism under the experimental conditions was not clarified.