Numerical investigation on pulsating heat pipes with nitrogen or hydrogen

[摘要] With flexible structure and excellent performance, pulsating heat pipes (PHP) are regarded as a great solution to distribute cooling power for cryocoolers. The experiments on PHPs with cryogenic fluids have been carried out, indicating their efficient performances in cryogenics. There are large differences in physical properties between the fluids at room and cryogenic temperature, resulting in their different heat transfer and oscillation characteristics. Up to now, the numerical investigations on cryogenic fluids have rarely been carried out. In this paper, the model of the closed-loop PHP with multiple liquid slugs and vapor plugs is performed with nitrogen and hydrogen as working fluids, respectively. The effects of heating wall temperature on the performance of close-looped PHPs are investigated and compared with that of water PHP.

[发布机构] Institute of Cryogenics and Refrigeration, Zhejiang University, Hangzhou; 310027, China^1;Department of Mechanical Engineering, University of Wisconsin Madison, Madison; 53706, United States^2;Department of Mechanical Engineering, Rongcheng Campus, Harbin University of Science and Technology, Rongcheng; 264316, China^3;Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Hangzhou; 310027, China^4;National Quality Inspection Center of Refrigeration Equipment (Henan), Minquan; 476800, China^5

[效力级别] 物理学 [学科分类] 材料科学（综合）

[关键词] Cooling power;Cryogenic fluids;Cryogenic temperatures;Numerical investigations;Oscillation characteristics;Pulsating heat pipe;Wall temperatures;Working fluid