Abstract
Pool boiling experiments are performed to investigate the onset of film boiling mechanisms on small horizontally oriented cylinders ranging in diameter from 11 to 510 μm. Three test liquids are used, FC-72, R-113 and methanol. Photographs indicate the existence of two mechanisms which proceed film boiling, hydrodynamic critical heat flux (CHF) and local dryout. The hydrodynamic CHF mechanism is observed for dimensionless radius ( R′) values as low as 0.0123. This leads to a modified version of Sun and Lienhard's hydrodynamic CHF correlation for cylindrical geometries which was developed in 1970. The local dryout mechanism is governed by boiling incipience phenomena. A method for predicting the local dryout heat flux for these conditions is presented.
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