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Two-phase flow characteristics of a high performance loop heat pipe with flat evaporator under gravity

机译：重力作用下带有平面蒸发器的高性能回路热管的两相流动特性

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摘要

Aiming to fully investigate the two-phase flow characteristics inside a loop heat pipe (LHP), a visualization study for a compact copper-water loop heat pipe with flat evaporator was carried out under gravity favorable mode in this work. Under forced water cooling condition with the cooling water temperature of 25 ℃, the results indicated that the compact LHP could efficiently dissipate a maximum heat load of 550 W with the evaporator temperature of 91.2 ℃ A minimum LHP thermal resistance was 0.068 ℃/W, which was obtained at 500 W. In addition, the evaporator temperatures at boiling incipience under different heat loads were evaluated, which showed slight dependence on the input heat load. Finally, the flow patterns during the startup stage and the steady stage associating with different heating loads were recorded and analyzed to investigate the internal operation mechanism of the LHP. As a result, various two-phase flow patterns were found to be related to the heat load, and the occurrence of partial dry-out was observed in the evaporator at the maximum heat load of 550 W, corresponding to a heat flux of 88 W/cm~2.
机译：为了充分研究回路热管（LHP）内部的两相流动特性，在重力有利模式下，对紧凑的带平面蒸发器的铜水回路热管进行了可视化研究。结果表明，在冷却水温度为25℃的强制水冷却条件下，紧凑型LHP可以有效耗散550 W的最大热负荷，蒸发器温度为91.2℃。LHP的最小热阻为0.068℃/ W。在500 W功率下获得的蒸发温度。此外，还评估了在不同热负荷下沸腾开始时的蒸发器温度，该温度对输入热负荷的依赖性很小。最后，记录并分析了启动阶段和稳态阶段与不同热负荷相关的流动模式，以研究LHP的内部运行机理。结果，发现各种两相流型与热负荷有关，并且在最大热负荷为550 W（对应于88 W的热通量）的情况下，在蒸发器中观察到部分变干的发生。 /厘米〜2。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2018年第2期|1063-1074|共12页
  • 作者

    Guohui Zhou; Ji Li;

  • 作者单位

    School of Engineering Science, University of Chinese Academy of Sciences, WA Yu-quan-lu Road, Shijingshan District, Beijing 100049, China;

    Laboratory of Advanced Thermal Management Technologies, School of Engineering Science, University of Chinese Academy of Sciences, 19A Yu-quan-lu Road, Shijingshan District, Beijing 100049, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Loop heat pipe; Visualization study; Two-phase flow; Flow patterns; Thermal resistance;

    机译：回路热管;可视化研究;两相流;流型;热阻;

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