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ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

International Heat Transfer Conference 13
August, 13-18, 2006, Sydney, Australia

MULTI-NOZZLE SPRAY COOLING: EFFECTS OF SPRAY INTERACTION

Get access (open in a dialog) DOI: 10.1615/IHTC13.p12.370
12 pages

Resumo

Heat transfer distributions produced by arrays (1, 1×2, and 2×2) of hollow-cone, gas-saturated PF5060 sprays were measured using a 7×7 mm2 microheater array operated at constant temperature. A total internal reflectance technique was used to visualize the liquid-vapor distribution on the surface. The local wall heat transfer at varying radial locations produced by a typical nozzle was determined by averaging the results from three nozzles placed at various locations above the microheater array. Single nozzle results were then used as a building block to predict the heat transfer produced by 1×2 and 2×2 nozzle arrays. The distance between the nozzles and heater surface (5 mm) was chosen such that there would be overlap between the sprays. Three models of multi-nozzle heat transfer were evaluated. Simple superposition of the single nozzle heat transfer to predict multi-nozzle data resulted in overprediction of the data. Dividing the heater surface into zones of influence based on symmetry and assuming single nozzle heat transfer within each zone resulted in underprediction of the data. Good results were obtained when the two models were combined-single nozzle heat transfer was used within a zone of influence except in the spray interaction zone where superposition was used. A comparison of the local heat transfer between the measured and predicted cases, however, indicated serious discrepancies that will require development of more sophisticated models if multi-nozzle spray cooling heat transfer is to be accurately predicted.