Computational Investigation in Two-Phase Flow Dynamics of Highly Subcooled Flow Boiling Using FC-72 Dielectric Fluid in Vertical Up-flow

Abstract

This computational simulation examines the flow of a specific dielectric electronic cooling fluid, FC-72, as it boils in a narrow channel with two opposing walls that supply heat at different rates. The heat flux provided by the walls is between 42-45% of the critical heat flux. The physical experiment with which the numerical data is compared with involved measuring local wall temperatures at various points along the channel and using this information to determine the heat transfer coefficient. The flow patterns and phases present are also observed. The results of a previously done experiment is compared with the predictions made by computer simulation using ANSYS FLUENT. The numerical calculations have been based on multiphase VOF model along with Lee model as the phase transition mechanism. The simulation takes into account the movement of the liquid and gas phases and heat transfer along the walls and the effect of gravity on fluid.