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Transport Phenomena in Thermal Engineering. Volume 2

ISBN Print: 1-56700-015-0

CHARACTERISTICS OF HIGH PRESSURE SPRAY COOLING

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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