Abstract
The purpose of this work is to present a stationary method for measuring heat transfer characteristics between a hot solid surface and impinged droplets. The stationary temperature distribution of the thin metal disk by impingement of a steady stream of uniform water droplets onto its central zone was measured. The results were analyzed to determine the heat transfer coefficient of spray cooling. It was found that the wetting regime was prevailing below 350°C and the non-wetting regime was above 400°C of the metal surface temperature. Within a few drops per second, the heat transfer coefficient is independent of collision rate of droplets to the surface in the non-wetting regime, while it is dependent even on such a small rate of droplets in the wetting regime.
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