Wetting delay due to film and transition boiling on hot surfaces

Abstract The time to achieve wetting of hot rods in air by a hot water jet was found to be a very strong function of water subcooling, and a strong function of jet velocity, surface thermal conductivity, heat generation rate, jet impact angle and surface temperature. Surface finish and rod size had little effect. The results agree with a simple model considering forced convection film boiling, heat generation and heat conduction from the surrounding surface.

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