Study on Isothermal Characteristics of Gravity Cesium Heat Pipe
ZHANG Kai1,2,YUE Kai1,YAN Xiao-ke2,TONG Wen-yu3
1. School of Energy & Environmental Engineering, University of Science & Technology Beijing, Beijing 100083, China
2. National Institute of Metrology, Beijing 100029, China; 3. Nanjing Tech University, Jiangsu, Nanjing 211816, China
Abstract：To verify the key technology of the development of the cesium heat pipe, the isothermal performance and the start-up characteristics of the gravity cesium heat pipe were studied under a constant temperature condition by measuring the temperature distribution of the outer wall of the heat pipe. Also, the effects of the length of the condensation section on the isothermal performance of the heat pipe were analyzed. The results showed that, the cesium heat pipe can start normally when the temperature of the heating furnace was in the range from 330℃ to 630℃ and had a good heat transfer ability. Moreover, the higher the temperature of the heating furnace, the faster the start-up of the heat pipe. The temperature of the wall surfaces of the heat pipe showed serrated temperature fluctuations when the length of the condensation section is 300mm. The mechanism of boiling phase transition heat transfer was analyzed in the heat pipe from the perspective of superheat. The selection of a suitable length of condensation section can avoid the occurrence of the phenomena of the periodic intermittent boiling. In addition, the experimental results proved that the cesium heat pipe can be used as a high-efficiency heat transfer element within the temperature range from 330℃ to 630℃, and is suitable for realizing the zinc freezing point of the ITS-90.
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2020, Vol. 41 
