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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

FULL COVERAGE IMPINGEMENT HEAT TRANSFER: THE INFLUENCE OF CHANNEL HEIGHT

Get access (open in a dialog) DOI: 10.1615/IHTC8.2090
pages 1205-1211

Abstract

Square arrays of circular jets, with an X/D of 7.1, impinging on an electrically heated continuous metal target plate were investigated for 0.5 < Z/D < 9.5 with a single side exit from the impingement gap. Crossflow produced a reduction in the impingement heat transfer at large Z/D but an enhancement of heat transfer with small Z/D. It was shown that this latter effect was mainly due to flow maldistribution caused by pressure gradients within the gap. A simple procedure was developed to predict when this effect was significant. For turbine blade impingement cooling designs, it was shown that flow maldistribution should not be a problem. The influence of crossflow heat transfer at small Z was also a significant contribution to the higher heat transfer.