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Boiling Structure and CHF Mechanism in Pool Boiling

机译:池沸腾的沸腾结构和CHF机理

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摘要

Dry area behavior and near-surface boiling structure were simultaneously visualized using a total reflection and diagonal view techniques, and a transparent ITO heating surface. Multiple lateral coalescences of individual bubbles with dried bases (dry spot) produce a coalesced massive bubble (CMB), and a large dry patch (LDP) is formed under the bubble by the merger of many dry spots. A residual dry patch (RDP) is produced at the departure of the CMB, preventing a complete wetting of the LDP. A further increase of the bubble nucleation activity makes the RDP re-expand to a LDP throughout consecutive departures of CMBs. As a result, a part of the RDP is never completely wetted and the dry patch evolves into an irreversible non-wetting hot spot, which eventually leads to the burn-out of a boiling surface.
机译:使用全反射和对角线观察技术以及透明的ITO加热表面,可以同时看到干燥区域的行为和近表面沸腾结构。单个气泡与干基(干斑)的多次横向合并会产生聚结的块状气泡(CMB),并且由于许多干斑的合并,在气泡之下形成了一个大的干斑片(LDP)。 CMB离开时会产生残留的干贴剂(RDP),从而阻止LDP完全润湿。气泡成核活性的进一步增加使RDP在CMB连续离开时重新扩展为LDP。结果,RDP的一部分永远不会被完全润湿,干燥的贴剂会演变成不可逆的非润湿热点,最终导致沸腾表面烧坏。

著录项

  • 来源
    《Journal of Heat Transfer》 |2013年第8期|080909.1-080909.1|共1页
  • 作者单位

    Thermal Hydraulics Safety Research Division, KAERI, Daejeon, Korea;

    Department of Nuclear and Quantum Engineering, KAIST, Daejeon, Korea;

    Thermal Hydraulics Safety Research Division, KAERI, Daejeon, 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

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