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首页> 外文期刊>International Journal of Heat and Mass Transfer >The effects of surface orientation, heater size, wettability, and subcooling on the critical heat flux enhancement in pool boiling
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The effects of surface orientation, heater size, wettability, and subcooling on the critical heat flux enhancement in pool boiling

机译：表面取向，加热器尺寸，润湿性和过冷度对池沸腾中关键热通量增强的影响

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摘要

Enhancing Critical Heat Flux (CHF) in pool boiling significantly extends the safety limit in the nuclear system, especially under the In-Vessel Retention-Reactor Vessel Cooling (IVR-ERVC) severe accident management strategy to avoid the failure of the lower head reactor pressure vessel. In this work, the lattice Boltzmann method (LBM) is employed to simulate the effect of surface orientation, wettability, geometric size, and subcooling of the downward-facing lower head on the CHF enhancement. It was found that for the downward-facing surface, the CHF increases with increasing surface orientation, while a vertical surface gives a slightly lower CHF compared to a near-vertical surface. Besides, the CHF for a downward facing surface increases with increasing wettability. The CHF performance of the near-vertical and vertical surfaces exhibits the largest improvement with decreasing surface contact angle. Moreover, it reveals that with an increased radius of the lower head, the CHF decreases for all curved surfaces, especially obvious for the inclination angle smaller than 90°. For a vertical surface, increasing the length of the heated surface has no obvious improvement on the CHF. This study also provides a discussion regarding the effect of subcooling on the CHF enhancement. It was found that the CHF increases with the increase of subcooling and the simulation results agree with the Elkassabgi-Lienhard and Zuber correlations.
机译：增强池沸腾中的临界热通量（CHF）大大延长了核系统的安全极限，特别是在船内保留反应器容器冷却（IVR-ERVC）的严重事故管理策略下，避免了较低塔顶反应堆压力的故障船只。在这项工作中，采用格子Boltzmann方法（LBM）来模拟表面方向，润湿性，几何尺寸以及朝下的下压头过冷对CHF增强的影响。已发现，对于朝下的表面，CHF随表面方向的增加而增加，而垂直表面的CHF值比垂直表面小。此外，面向下表面的CHF随着润湿性的增加而增加。随着表面接触角的减小，近垂直和垂直表面的CHF性能表现出最大的改善。此外，它表明，随着下头部半径的增加，所有曲面的CHF都会减小，尤其是对于小于90°的倾斜角而言尤其如此。对于垂直表面，增加加热表面的长度对CHF没有明显的改善。这项研究还讨论了过冷对CHF增强的影响。结果发现，CHF随过冷度的增加而增加，模拟结果与Elkassabgi-Lienhard和Zuber的相关性吻合。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2020年第3期|119230.1-119230.10|共10页
  • 作者

  • 作者单位

    Department of Mechanical Engineering City University of Hong Kong Tat Chee Avenue Kowloon Tong Hong Kong SAR China;

    Institute of Energy Environment and Economy Tsinghua University Beijing 100084 China;

    State Key Laboratory of Virtual Reality Technology and Systems & Suzhou Institute of Beihang University Suzhou 215200 China;

    Department of Mechanics and Aerospace Engineering Southern University of Science and Technology Shen Zhen 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

    Pool boiling; Lattice Boltzmann method; Orientation; Wettability; Geometric size; Subcooling; In-vessel retention;

    机译：池沸腾;格子波尔兹曼法方向;润湿性几何尺寸;过冷血管内滞留;

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