The experimental facility about the test of pressure drop and heat transfer coefficient in pump-assisted heat pipe was built for the study of characteristics during flow condensation heat transfer. The experimental investigation about characteristics during flow condensation heat transfer of R134a in pump-assisted heat pipe at different mass flux and vapor quality was conducted. The experimental results indicated that pressure drop increases with the increasing vapor quality and the mass flux. The experimental results were compared with three different pressure drop models and the conclusion that Muller-Steinhagen-Heck model can better predict the characteristics of pressure drop in the process of flowing condensation is obtained. In addition

the experimental results indicated that heat transfer coefficient increases with the increasing vapor quality and the mass flux and the growth slope of low vapor quality is higher than that of high vapor quality. The experimental results were compared with four different heat transfer models and the conclusion that Chen model can better predict the characteristics of heat transfer in the process of flowing condensation is obtained. The study provides a theoretical reference for the selection of the pump

the design of the heat exchanger

the optimization of the system and the study of two-phase flow condensation.