Abstract
In this report, subcooled film-boiling heat transfer of liquid film flow formed by liquid spray on a hot surface was simulated by film-boiling heat transfer of a subcooled liquid film flow supplied from a nozzle along the hot surface. Experimental data indicated that the effects of film thickness, wall superheat and distance from the leading edge on the film-boiling heat transfer were weak. The main parameters controlling the film-boiling heat transfer were liquid velocity and subcooling. The modified heat transfer coefficient was defined as the ratio of wall heat flux to liquid subcooling and a heat transfer correlation between the Nusselt number based on the modified heat transfer coefficient and the Reynolds number was obtained. The correlating equation was very similar to that of turbulent heat transfer of single phase flow, and it was found that most of the heat flux was dissipated to increase the liquid temperature.
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