Experimental Study On Phase Change Heat Transfer Enhancement In Vertical Tube

High-flux reboiler is a new energy-efficient heat transfer equipment, it is widely used at home and abroad currently. High-flux tube is a double-sided reinforced heat transfer tube, the particularity of its structure also bring challenge to the heat exchanger design. The enhancement of heat transfer performance of copper-based high-flux tube is rarely reported currently. In order to evaluate it’s heat transfer performance, we self-designed and built a phase change heat transfer multi-purpose experimental station. Finished heat transfer performance comparative experiments of UOP high flux tube and smooth tube, the working fluid was water. The results showed under the same condition, the heat transfer performance of UOP high flux tube was obviously better than the smooth tube. The total heat transfer coefficient, boiling heat transfer coefficient, condensation heat transfer coefficient were1.85-2.25times,2.85-3.53times,1.17-1.76times of the smooth tube.Analysed heat transfer enhancement mechanism of high flux tube, including the enhancement of boiling heat transfer by sintered porous surface and the enhancement of condensation heat transfer by vertical flute. Established boiling heat transfer correlation and condensation heat transfer correlation by using the experimental data and physical properties of the working fluid under experimental temperature. The research in this paper provides certain theoretical basis for the process design of the same kind of heat transfer equipment.