Abstract
In the present, film boiling heat transfer and minimum heat flux condition were experimentally studied for subcooled pool boiling of water at atmospheric pressure from a platinum sphere (D=10 mm). Transient tests of subcooled boiling were conducted from an initial temperature of the sphere about 1500K. Experimental parameters were liquid subcooling (075 K) and the depth of immersion of the sphere (0.75 D3.0 D). The obtained boiling curves indicated that the ideal depth was 1.8D. Even for large subcooling conditions, the measured temperature at the minimum heat flux point for such a depth did not remarkably exceed the maximum superheat of water. Further, accounting for the density-viscosity ratio, the analytical equation for subcooled film boiling derived by Hamill and Baumeister was modified. This modified equation was in good agreement with experimental data of water and freon-11 under various conditions of surface geometry, size and system pressure.
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