Heat pipe play an important role in high temperature energy transfer system and storage system. It can be applied to the areas such as solar energy storage system and waste heat recovery. High temperature heat pipes with 420 mm in length, 13 mm in outer diameter and 2 mm in tube thickness have been developed and tested. The device was made of Inconel 600 equipped with a 316 stainless steel 100 mesh wick. The working fluid was metal sodium with a filling ratio of 10% (2.86 g). Heat pipes start-up and thermal characteristics were investigated at different orientations with slopes of -15, 0, +45 and +90 while heat sink temperatures were kept at 27 C air environment. The evaporator temperature of 800 C was achieved when the input power was set at 790 W. It has been found that the lowest value of the heat pipes thermal resistance was 0.11 C/W when the inclination angle was at 90.
Journal of Applied Science and Engineering 22(3), p.493-499