CO{sub}2 Impinging Jet Cooling of a Porous Surface using a Circular Nozzle with a Flange

摘要

The present study aims at improving the impinging jet heat transfer by placing an open-cellular porous plate on a heated surface, on which a circular jet nozzle with a flange is installed, and thus the porous plate is bounded by the heated surface and the flange and is expected to act as a heat sink. In the experiment, CO{sub}2 gas was used as a coolant and Ag, Cu, Ni and Ni-Cr porous plates having various porosities, pores per inch and thicknesses were examined. It is found that the impingement heat transfer can be augmented appreciably by placing an appropriate open-cell porous plate in a heating section and incorporating a throttle valve into a flow system.