Abstract

Spray cooling of a heated solid surface using water spray was investigated. In this experiment, uniform heat flux condition was assumed, and the liquid flow rates and nozzle orifice diameter were selected as main variables. Two water spray temperatures were used for the tests. Saturated water spray was used to measure the wall superheat temperature. Subcooled water was used to measure the effect of water spray in the single-phase regime. Tests using the saturated water showed that the heat transfer rate was a function of Weber number and the superheat temperature. The surface temperature was related to the characteristic velocity and the droplet diameter. On the other hand, tests using the subcooled water spray showed little dependence on the liquid flow rate and the nozzle orifice diameter in the single-phase regime. A correlation was obtained in terms of Reynolds number and Prandtl number. Test results indicated that the spray cooling was more effective during the evaporation of the thin liquid film above the saturation temperature.

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