Transport Phenomena in Thermal Engineering. Volume 2

ISBN Print: 1-56700-015-0

CHARACTERISTICS OF HIGH PRESSURE SPRAY COOLING

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DOI: 10.1615/ISTP-VI.870
pages 1320-1324

I. S. Lee Department of Mechanical Engineering, Monash University, Clayton, Victoria 3168, AUSTRALIA

R. Gani Department of Mechanical Engineering, Monash University, Clayton, Victoria 3168, AUSTRALIA

T. T. Nguyen CRC for Alloy and Solidification Technology (CAST) CSIRO Division of Manufacturing Technology Preston, Victoria 3072, Australia

G .M. Leigh Divsion of Mathematics and Statistics, CSIRO, Clayton, Victoria 3168, AUSTRALIA

R. J. Esdaile Division of Manufacturing Technology, CSIRO, Preston, Victoria 3072, AUSTRALIA

Abstract

We describe an experimental program for investigating the effects of high pressure sprays of water on a hot target. The experimental variables were target initial temperature, spray pressure and nozzle orifice size.
The results obtained from the experiments showed that high pressure liquid sprays provided a very high heat removal rate, with a large heat transfer coefficient. Average heat fluxes during the first 3 seconds of spraying were from 0.93 to 7.66 MWm−2 and average heat transfer coefficient from 13.3 to 68.7 kWm−2 K−1. The average heat flux was correlated well by a two region correlation which identifies that an optimum water flux occurs at 0.073 m3s−1m−2 :
qs = 0.027 W0.21ΔTi, 0.011 ≤ W ≤ 0.073
qs = 0.0155 ΔTi, 0.073 ≤ W ≤ 0.244
where 90 < ΔTi < 480

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