Abstract
Heat transfer in natural-convection film boiling with a wavy interface is investigated analytically. The vapor-film-unit model proposed in the first report for saturated film boiling is extended to subcooled film boiling with a wavy interface. In this extended model, based on the mean vapor velocity and the vapor film thickness under a subcooled condition, the vapor-film-unit length along an inclined flat plate is determined for subcooled film boiling as a function of the inclination angle. Using this result and accounting for movement of the vapor-film units, vapor-film units are arranged along the vertical surface and the periphery of the horizontal cylinder. The time-averaged local heat transfer coefficient is determined by integrating the time-dependent local heat transfer coefficient. The heat transfer coefficient averaged over the surface is determined by integrating the distribution of the time-averaged local values. The predictions of the model agree well with experimental data for film boiling along long vertical surfaces and around horizontal cylinders of large diameter. It is concluded, thus, that the extended vapor-film-unit model can correctly describe the effects of fluid properties, liquid subcooling, surface superheating and surface dimensions on film-boiling heat transfer with a wavy interface.
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