A study of thermal behavior of liquid nitrogen heat pipe for wide range of heat loads at several filling ratios
WANISON Ramnarong （総研大）； 木村 誠宏 （KEK）； 村上 正秀 （筑波大）
Abstract:It is the primary purpose of this research to survey the thermal behavior of cryogenic heat pipes under the condition of a wide range of heat load; from the normal heat pipe operation to the film boiling states. The heat pipes tested are commercially available ones but working fluid was replaced by liquid nitrogen. The size of the tubular copper heat pipe is; 6 mm in the outer diameter and 200 mm long, with a wick structure composed of fine axial grooves and sintered fine metal particles. The performance of the heat pipes with different liquid filling ratios was examined. The effective thermal resistance and the axial temperature distribution were measured for a wide range of heat load at several filling ratios. The thermal behavior in the film boiling and even the local dry-out states for large heat input was also examined for the potential application to a heat pipe heat switch.