PREDICTION OF HEAT-TRANSFER BY DIRECT CONTACT CONDENSATION AT A STEAM SUBCOOLED WATER INTERFACE

An investigation is carried out on heat transfer by direct contact condensation at a steam-subcooled water interface in a horizontal rectangular channel. Three types of models are used to predict the heat transfer coefficient at the interface. The heat conduction model is used to estimate the lowest limit of heat transfer. The modified k-epsilon model, which stimulates the near-interface variation of the turbulence quantities, shows the more improved prediction compared with the wall k-epsilon model and agrees with the experimental results with smooth interfaces. The experimental results with interfacial waves are predicted quantitatively by introducing the interfacial wave effect into the surface renewal model.