Experiments on the transient film boiling heat transfer from a horizontal circular plate facing downward to a subcooled water at atmospheric pressure have been carried out by a quenching method. The test section used in the experiments is made of a copper cylinder with 30 mm in thickness and 50 mm in diameter, which is insulated on the sides and at the back surface by Teflon. Boiling curves are examined for saturated and subcooled conditions. Results show that film boiling heat fluxes are increased up to max. 230% with increasing of liquid subcooling from 0 to 60K.
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