긴 히트파이프와 써모사이폰의 열수력적 특성 연구

The present study is to compare thermal hydraulic characteristics between a heat pipe and a thermosyphon with relatively large length. Recently the heat transfer devices have been seriously considered for the passive heat removal of reactor core or spent fuels in the nuclear industry. In this research, a series experimental works have been made to measure the thermal performances of heat pipe and thermosyphon with large length conditions. A heat pipe and a thermosyphon with 3m of length and 16.57mm of inner diameter were specially manufactured for experiment. Surface temperature and pressure were measured to compare their performances. The experimental results show that the thermal resistance of heat pipe is 92.61% higher than that of thermosyphon in maximum. It was also found that the gap of thermal resistance increases as the heat input increases. The reason seems to be that the wick structure may work as obstacle for vapor and fluid flow in the large length condition. Therefore, it can be concluded that a thermosyphon shows better performance than heat pipe in the large length condition.