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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effects and limitations of superhydrophobic surfaces on the heat transfer performance of a two-phase closed thermosyphon
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Effects and limitations of superhydrophobic surfaces on the heat transfer performance of a two-phase closed thermosyphon

机译：超疏水表面对两相封闭热烃热传热性能的影响及局限

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摘要

A two-phase closed thermosyphon (TPCT), also called a gravity-assisted heat pipe, is an efficient heat transfer device that exploits boiling and condensation phase-change phenomena to transport large amounts of heat. Recently, jumping droplet condensation on a well-designed superhydrophobic (SHPo) surface has shown superior condensation heat transfer coefficient (HTC), exceeding -380% and -30% over conventional filmwise and dropwise condensation, respectively. However, SHPo surfaces within TPCTs have shown much lower HTCs than expected, and the exact cause of this has not been investigated yet. Here, we experimentally explored the effects and limitations of a SHPo surface in a TPCT by visualizing the internal flow patterns and condensation behavior according to heat flux. We constructed a TPCT device capable of visualizing the inside and fabricated a SHPo surface on a condenser wall of the TPCT. We revealed two important condensation characteristics that limit the condenser HTC of the SHPo surface and the TPCTs heat transfer performance. At high heat fluxes (≥ 90 kW/m~2), the repetitive liquid collision led to an early flooding transition of the surface and a stepwise decrease in the condenser HTC. At low heat fluxes (< 90 kW/m~2), counter-current flow generated by the evaporation and boiling caused the drag force enough to entrain growing and jumping droplets, which interrupted the removal of condensate from the surface and limited the condenser HTC. We quantified their effects on the condenser and TPCT's heat transfer performance using experiments and analytical models.
机译：两相封闭的热烃（TPCT），也称为重力辅助热管，是一种有效的传热装置，可利用沸腾和冷凝相变现象来运输大量的热量。最近，在设计良好设计的超疏水（SHPO）表面上的跳跃液滴冷凝显示出优异的缩合传热系数（HTC），分别超过-380％和-30％，分别在传统的胶片和滴缩。然而，TPCT中的SHPO表面已经显示出比预期更低的HTC，并且尚未研究其确切原因。在这里，我们通过根据热通量通过可视化内部流动模式和冷凝行为来实验探索了TPCT中的SHPO表面的效果和限制。我们构建了一种能够在TPCT的冷凝器壁上形成内部的TPCT装置，并在TPCT的冷凝器壁上制造SHPO表面。我们揭示了两个重要的冷凝特性，限制了SHPO表面的冷凝器HTC和TPCT热传递性能。在高热量通量（≥90kW / m〜2），重复液体碰撞导致表面的早期泛洪过渡和冷凝器HTC的逐步减少。在低热量（<90 kW / m〜2）中，通过蒸发和沸腾产生的反电流导致阻力足以纳入生长和跳跃的液滴，这会中断从表面中的冷凝物中的除去并限制冷凝器HTC 。我们使用实验和分析模型量化了对冷凝器和TPCT的传热性能的影响。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第9期|121446.1-121446.15|共15页
  • 作者

    Donghyun Seo; Jinsoo Park; Jaehwan Shim; Jeonghyeon Nam; Dong Hwan Shin; Youngsuk Nam; Jungho Lee;

  • 作者单位

    Department of Energy Conversion Systems Korea Institute of Machinery and Materials 156 Gajeongbuk-Ro Yuseong-Gu Daejeon 34103 Republic of Korea;

    Department of Energy Conversion Systems Korea Institute of Machinery and Materials 156 Gajeongbuk-Ro Yuseong-Gu Daejeon 34103 Republic of Korea;

    Department of Mechanical Engineering Kyung Hee University 1732 Deogyeong-daero Giheung-gu Yongin Cyeonggi-do 17104 Republic of Korea;

    Department of Mechanical Engineering Kyung Hee University 1732 Deogyeong-daero Giheung-gu Yongin Cyeonggi-do 17104 Republic of Korea;

    Department of Energy Conversion Systems Korea Institute of Machinery and Materials 156 Gajeongbuk-Ro Yuseong-Gu Daejeon 34103 Republic of Korea;

    Department of Mechanical Engineering Kyung Hee University 1732 Deogyeong-daero Giheung-gu Yongin Cyeonggi-do 17104 Republic of Korea;

    Department of Mechanical Engineering Ajou University 206 Worldcup-ro Yeongtong-gu Suwon Gyeonggi-do 16499 Republic of Korea;

  • 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

    Thermosyphon; Heat pipe; Heat transfer; Condensation; Superhydrophobic; Wettability;

    机译：热水磷;热管;传播热量;缩合;超富氢化;润湿性;

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