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Experimental and theoretical research on capillary limit of micro heat pipe with compound structure of sintered wick on trapezium-grooved substrate

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Abstract

Since heat flux increases sharply yet cooling space in microelectronic and chemical products gradually decreases, a micro heat pipe has been an ideal device for heat transfer for high heat-flux products, and its performance depends largely on its capillary limit. This study proposed an integrated utilization of the advantages of lower backflow resistance to working fluid in trapezium-grooved-wick micro heat pipes and greater capillary force in sintered-wick micro heat pipes; first the factors that are crucial to both types’ heat transfer performances were analyzed, and then mathematical modeling was built for capillary limit of a micro heat pipe with the compound structure of sintered wick on trapezium-grooved substrate, and finally heat transfer limits for micro heat pipes with a trapezium-grooved wick, a sintered wick and with a compound structure were tested through experiments. Both the theoretical analysis and experimental results show that for a micro heat pipe with proposed compound structure, its capillary limit is superior to that of a micro heat pipe with a simplex sintered wick or trapezium-grooved wick.

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Acknowledgments

This project supported by National Natural Science Foundation of China (51075218), Natural Science Foundation of Heilongjiang Province of China (E200909) and Hei Long Jiang Postdoctoral Foundation (LBH-Z10006).

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Authors and Affiliations

  1. School of Mechanical Engineering, Qiqihar University, Qiqihar, 161006, China

    Xibing Li, Jianjia Wang, Qingming Hu, Li Bao & Hongjun Zhang

  2. Qiqihar CNC Equipment Corp. Ltd., Qiqihar, 161005, China

    Xibing Li

  3. Department of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin, 150080, China

    Xibing Li

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  1. Xibing Li
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  2. Jianjia Wang
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  3. Qingming Hu
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  4. Li Bao
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  5. Hongjun Zhang
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Correspondence to Xibing Li.

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Li, X., Wang, J., Hu, Q. et al. Experimental and theoretical research on capillary limit of micro heat pipe with compound structure of sintered wick on trapezium-grooved substrate. Heat Mass Transfer 49, 381–389 (2013). https://doi.org/10.1007/s00231-012-1090-y

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  • DOI: https://doi.org/10.1007/s00231-012-1090-y

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