Modeling of Bulk Evaporation and Condensation

摘要: This report describes the modeling and mathematical formulation of bulk evaporation condensation involved in liquid-vapor phase change processes. An internal energy formulation, for these processes that occur under constraint constant volume, was studied. Compared to enthalpy has a more concise compact form. The velocity time scales interface movement were obtained through scaling analysis verified by performing detailed numerical experiments. convection effect induced density analyzed found be negligible compared conduction effect. Two iterative methods updating value vapor fraction, based (E-based) temperature (T-based) methods, investigated. Numerical experiments revealed problems E-based method is superior T-based terms computational efficiency. used compute different conditions. evolution work provided basis thermal performance multi-phase nuclear fuel elements variable gravity conditions, which buoyancy due effects heating are involved.