Experimental investigation of the thermal performance of high-temperature flat heat pipe with a single heat source and a multi heat source

This study proposed a sodium high-temperature flat heat pipe (HTFHP) and conducted a series experimental research. The experiment compared the impact of different heating power and heat source arrangement on the startup performance and temperature distribution of the HTFHP. The experimental conditions involved varying heating power and different heat source layouts, including the use of either one or two heat sources. Results indicate that the HTFHP could start stably when the input power was 450-600 W. The single heat source started the fastest at an input power of 600 W, with a startup time of 893 s. The multiple heat sources started the fastest, with a start time of 533 s, when both sides had an input power of 600 W. The startup time shortened as the input power increased. At high input power, the temperature distribution of the HTFHP was more uniform at different positions, and the minimum temperature difference between the evaporating section and the condensing section was 31celcius. In multiple heat source conditions, the temperature at the evaporating section fluctuated slightly except at the heat source points. The findings indicated that HTFHP has good startup performance, can quickly dissipate heat, and has great potential for application.