Experimental studies on a high performance compact loop heat pipe with a square flat evaporator |
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| Authors: | Ji Li Daming Wang G.P. Peterson |
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| Affiliation: | 1. Laboratory of Electronics Thermal Management, College of Physics, Graduate University of Chinese Academy of Sciences, 19A Yu-quan-lu Road, Shijingshan District, Beijing 100049, PR China;2. Beijing Technology Research Center, Asia Vital Components Co., LTD., Haidian District, Beijing 100085, PR China;3. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30318, United States;1. Key Laboratory of Surface Functional Structure Manufacturing of Guangdong Higher Education Institutes, South China University of Technology, Guangzhou 510640, China;2. Xiamen Institute of Technology Huaqiao University, Xiamen 361021, China;3. Department of Physics, School of Science, South China University of Technology, Guangzhou 510640, China;1. State Key Laboratory of Air-conditioning Equipment and System Energy Conservation, GREE Electric Appliances Inc. Zhuhai, 519070, China;2. School of energy and power engineering, Huazhong University of Science and Technology, Wuhan, 430074, China |
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| Abstract: | A thorough experimental investigation was carried out on a copper–water compact loop heat pipe (LHP) with a unique flat, square evaporator with dimension of 30 mm (L)×30 mm (W)×15 mm (H) and a connecting tube having an inner diameter of 5 mm. Using a carefully designed experimental system, the startup process of the LHP when subjected to different heat loads was studied and the possible mechanisms behind the observed phenomena were explored. Two main modes, boiling trigger startup and evaporation trigger startup, were proposed to explain the varying startup behavior for different heat loads. In addition, an expression was developed to describe the radius of the receding meniscus inside the wick, to balance the increased pressure drop along the LHP with increasing heat loads. Finally, insight into how the compact LHP can transfer heat loads of more than 600 W (with a heat flux in excess of 100 W/cm2) with no occurrence of evaporator dry-out was provided. |
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