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Experimental analysis of the evaporation regimes of an axially grooved heat pipe at small tilt angles

机译：小倾角下轴向开槽热管蒸发状态的实验分析

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摘要

Using a high-speed digital microscope, visualization experiments of the vapor-liquid two-phase flow and heat transfer in an axially grooved heat pipe are conducted to investigate the evaporation regimes that occur at small tilt angles. The effects of the heat load and tilt angle on these evaporation regimes are analyzed. The evaporation regimes are further quantitatively characterized with a regime diagram developed based on the Bond number and Weber number. The results indicate that, unlike in a horizontal position, the evaporation regime of a grooved heat pipe with a small tilt angle can include corner-film evaporation induced by the combination of gravity and capillary force in addition to pool-surface evaporation and fin film evaporation. Corner-film evaporation is the characteristic evaporation regime of an axially grooved heat pipe-with-a-small tilt-angle, and it exhibits-random-oscillatory motion of the vapor-liquid interface. Pool-surface evaporation is observed at small Weber numbers, corner-film evaporation occurs at large Weber numbers when the Bond number is approximately greater than 0.003, and fin-film evaporation occurs at medium Weber numbers. (C) 2018 Elsevier Ltd. All rights reserved.
机译：使用高速数字显微镜，在轴向开槽的热管中进行了气液两相流动和传热的可视化实验，以研究在小倾斜角下发生的蒸发情况。分析了热负荷和倾斜角对这些蒸发方式的影响。利用基于键数和韦伯数建立的状态图进一步定量表征蒸发状态。结果表明，与水平位置不同，具有小倾角的开槽热管的蒸发方式除了池面蒸发和翅片蒸发外，还可以包括重力和毛细作用力共同作用引起的角膜蒸发。 。角膜蒸发是具有小倾角的轴向开槽热管的特征蒸发方式，它表现出气液界面的随机振荡运动。当键数大约大于0.003时，在小的Weber数下观察到池面蒸发，在较大的Weber数下观察到角膜蒸发，而在中等Weber数下观察到翅片蒸发。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2018年第ptab期|334-341|共8页
  • 作者

    Yu Fawen; Yu Cheng; Cao Jianguang; Chen Yongping;

  • 作者单位

    Southeast Univ, Sch Energy & Environm, Minist Educ, Key Lab Energy Thermal Convers & Control, Nanjing 210096, Jiangsu, Peoples R China;

    Southeast Univ, Sch Energy & Environm, Minist Educ, Key Lab Energy Thermal Convers & Control, Nanjing 210096, Jiangsu, Peoples R China;

    Shanghai Inst Satellite Engn, Shanghai 200240, Peoples R China;

    Southeast Univ, Sch Energy & Environm, Minist Educ, Key Lab Energy Thermal Convers & Control, Nanjing 210096, Jiangsu, Peoples R 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

    Heat pipe; Evaporation; Groove; Capillary; Gravity;

    机译：热管;蒸发;沟槽;毛细管;重力;

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