Abstract
The effect of forced convection on boiling heat transfer was investigated by experiment using water jet for a small unwetted heating surface which was coated with a silicon resin, AY49-208, on the copper surface under atmospheric pressure. The water jet velocity and the subcooling of water gave no effect on the heat transfer for a wetted heating surface in the nucleate boiling region, but the heat flux increased remarkably with the increase of jet velocity and the subcooling of water at the same superheat of heating surface for the unwetted heating surface. And the heat flux increased monotonously with the increase of the superheat of the heating surface. This unusual heat transfer was the same one for the pool boiling in the same kind of unwetted heating surface.
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