A study of the thermal behavior of a nitrogen heat pipe for a wide range of heat loads at several filling ratios

27th International Cryogenics Engineering Conference and International Cryogenic Materials Conference 2018

Wanison, R.^1 ; Kimura, N.^1^2 ; Murakami, M.^3

Graduate University for Advanced Studies (SOKENDAI), 1-1 Oho Ibaraki, Tsukuba

305-0801, Japan^1

High Energy Accelerator Research Organization (KEK), 1-1 Oho Ibaraki, Tsukuba

305-0801, Japan^2

University of Tsukuba, 1-1-1 Tennodai Ibaraki, Tsukuba

305-85773, Japan^3

关键词: Cryogenic heat pipe;    Effective thermal resistance;    Fine metal particles;    Liquid nitrogen temperature;    Outer diameters;    Temperature applications;    Thermal behaviors;    Wick structures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/502/1/012093/pdf
DOI  :  10.1088/1757-899X/502/1/012093

来源: IOP

【 摘 要 】

The primary purpose of this research was to investigate the thermal behavior of cryogenic heat pipes with a wide range of heat loads, from normal heat pipe operation to film boiling states. The heat pipes tested are commercially available from Fujikura Electronics (Thailand) Ltd., and they were originally designed and optimized for room temperature applications using water as a working fluid. We replaced the water with nitrogen as a working fluid, and we operated it as a cryogenic heat pipe at a liquid nitrogen temperature. The size of the tubular copper heat pipe was 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 loads at several filling ratios. The thermal behavior in the film boiling and the local dry states for large heat input were also examined for the potential application to a heat pipe heat switch.Published under licence by IOP Publishing Ltd.