Correlation of pool boiling heat transfer and enhancement by microstructure surfaces at sub-atmospheric pressures

Abstract

Compared with standard atmospheric pressures (std-ATM), there is a significant difference in heat transfer phenomenon of pool boiling at sub-atmospheric pressures(sub-ATM). The mechanism by which pressure affects the heat transfer capacity of pool boiling cooling remains unknown. In this work, the effect of pressures on pooling boiling heat transfer was investigated and microstructure surfaces were proposed to enhance the heat transfer capacity. The experimental results demonstrate that the decrease of pressure has a suppressing effect on the pool boiling heat transfer capacity. At sub-atmospheric pressures, microstructure surface can improve pool boiling heat transfer, and the improvement increases with the decrease of pressure. The dimensionless correlation for pool boiling considering pressure was fitted, with an average error of 13.1%. A dimensionless correlation for pool boiling considering microstructure surfaces and pressures was fitted, and an average error of 12.5% was verified.