Flow Boiling Heat Transfer and Pressure Drop Characteristics in Expanding Microgap Channel

Abstract

The current chapter presents the heat transfer and pressure drop data of three different microgap heat sinks collected during the experimental program. The aims of this study are to understand the parametric effects including heat flux, mass flux, and channel dimension on heat transfer and pressure drop in expanding microgap experimentally. High-speed flow visualizations are conducted simultaneously along with the experiments to explore the bubble behavior in expanding microgap heat sink. Results are presented for wide range of heat and mass fluxes, validated by high-speed visualizations and compared with literatures. Enhanced heat transfer performances and reduced pressure drop are reported in flow boiling expanding microgap heat sinks.