Development of Multiscale Two-Phase Flow Analysis Method Using Phase-Field Method and Two-Fluid Model

Abstract

Thermal and/or nuclear power plants utilize heat transfer phenomena caused by phase changes of fluids to transport the enormous amount of heat generated by boilers or reactors. Thus, a detailed understanding of their heat transfer behavior is important for improving plant performance and safety. The two-phase flow generated in the plants is unsteady and multi-scale ranging from mm to several meters, and it was difficult to understand the details by the conventional two-fluid model based on averaging. In this study, we proposed the hybrid method by combining the two-fluid model with the phase field method which is recently known as the attractive method for phase-change simulations. The proposed hybrid method was compared with reference data in the benchmark problems and good agreement between them was obtained.