Subcooled Forced Convection Film Boiling Drag And Heat Transfer Of A Wedge

Subcooled laminar forced convection film boiling flow on a wedge is analyzed considering the streamwise pressure gradient imposed on the flow and the streamwise buoyancy force acting on the vapor film. A two-phase boundary-layer model is proposed, and the local similarity concept is applied to obtain an approximate solution of the governing equations. For a water-steam system at atmospheric pressure considered within this study, wall skin friction results display a strong dependency on the streamwise buoyancy force driving the vapor film and the external pressure gradient. Adverse streamwise buoyancy force acting on the vapor film, which is the case on the lower surface of a horizontally aligned wedge, may cause vapor flow separation. In contrast to wall skin friction dependency, the wall heat transfer parameter shows a secondary dependence on the streamwise pressure gradient and the buoyancy force