AN ANALYSIS OF SUBCOOLED TURBULENT FILM BOILING ON A MOVING ISOTHERMAL SURFACE

When film boiling occurs on a moving superheated surface, the vapor la yer which forms between the surface and liquid reduces the drag force and heat transfer. In this study, heat transfer associated with subcoo led turbulent film boiling on a moving isothermal surface is investiga ted using both local similarity and integral methods. Using a two-phas e boundary-layer model and assuming power-law profiles for the velocit y and temperature distributions, integral forms of the mass, momentum and energy-conservation equations, together with compatibility conditi ons at the vapor-liquid interface, were solved for both the vapor and liquid layers. In order to assess the merit of this analytical procedu re, a local similarity solution to the same problem was obtained using the modified Cebeci-Smith eddy-viscosity model with the Cebeci-Bradsh aw algorithm for turbulent boundary-layer flow. Numerical results reve al the effects of relevant parameters such as plate velocity, the rati o of plate-to-free-stream velocity, and liquid subcooling.