Modeling of the Evaporation and Condensation Phase-Change Problems with FLUENT

Based on the volume-of-fluid (VOF) method in the FLUENT code, many phase-change models have been proposed and applied to simulate evaporation and condensation problems. To further improve the accuracy, in this article a new phase-change model is built using user-defined functions (UDFs). The accuracy of this new phase-change model is verified by two evaporation problems (a one-dimensional Stefan problem and a two-dimensional film boiling problem) and one condensation problem (single steam bubble condensation in subcooled water). The simulation results of this new model show good agreement with the classical analytical or numerical results, proving its accuracy and feasibility.