Abstract
Micro heat pipes (MHPs) with excellent heat transfer performance have been the ideal radiating components to meet increasingly higher requirements posed by high heat-flux products. Based on MHPs’ working principle, this study deduced capillary limit of a novel MHP with compound structure of sintered wick on grooved substrate, and probed into its forming mechanism: first, high-speed oil-filled spinning was applied to fabricating micro grooves, with optimal spinning and drawing speeds determined; then a mini-type vibration machine was used to help fill copper powders fast and uniformly, with appropriate sintering temperature and time fixed; the manufacturing method that integrates vacuum-pumping–cold-welding with secondary-degassing–cold-welding to increase vacuumizing efficiency. The results of experiments on its heat transfer performance show that the MHPs with sintered-wick-on-grooved-substrate structure fabricated through the proposed forming method can not only acquire much better heat transfer performance, but have advantages such as higher productivity and lower cost.
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This project supported by University Key Teacher Foundation of Heilongjiang Province of China (1253G065).
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Li, X., Li, M., Li, M. et al. Forming method of micro heat pipe with compound structure of sintered wick on grooved substrate. Heat Mass Transfer 52, 581–593 (2016). https://doi.org/10.1007/s00231-015-1585-4
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DOI: https://doi.org/10.1007/s00231-015-1585-4