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Observation of heat transfer mechanisms in saturated pool boiling of water by high-speed infrared thermometry

机译：高速红外测温法观察水饱和池沸水中的传热机制

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摘要

We investigated experimentally the heat transfer mechanisms in saturated pool boiling of water. In the experiment, the temperature of a sapphire heated wall with a titanium thin-film heater was visualized using a high-speed infrared camera with a spatial resolution of 82 μm/pixel and a framing rate of 3,000 fps. Local heat transfer characteristics of the fundamental heat transfer processes, including microlayer evaporation, dry-out, transient heat conduction immediately after rewetting, and convective heat transfer, were investigated based on the surface heat flux distribution obtained by three-dimensional transient heat conduction analysis of the heated wall. The contribution of microlayer evaporation, which shows a high heat flux far exceeding the applied heat flux, to the bubble growth was found to be about 50%, and the heat transfer within the microlayer was dominated by one-dimensional heat conduction in the thickness direction. It was confirmed that the local heat removal immediately after rewetting of the dry patch can be reproduced by the transient heat conduction model. The enhancement of convection by the isolated bubble motion was small, while the interaction between bubbles agitated the liquid strongly and enhanced the convective heat transfer. Via partitioning the heat flux distribution by image analysis, the convective heat transfer was found to be the dominant wall heat transfer mode, and the contribution of the microlayer with an area coverage ratio with respect to the total heat transfer area of less than 10% was small, around 25%.
机译：我们通过实验研究了水的饱和池中的热传递机制。在实验中，使用具有82μm/像素的空间分辨率的高速红外摄像机可视化具有钛薄膜加热器的蓝宝石加热壁的温度，其空间分辨率为3,000 fps的帧速率。基于通过三维瞬态传热分析获得的表面热通量分布，研究了基本传热过程的局部传热过程，包括微层蒸发，干式，干出来，干扰，干出来，以及对流热传递加热的墙壁。微层蒸发的贡献，其表示远远超过施加的热通量的高热量通量，发现气泡生长为约50％，并且微层内的热传递在厚度方向上通过一维导热来支配。证实，可以通过瞬态导热模型再现紧接在干贴片之后的局部热除去。分离的气泡运动的对流提高较小，而气泡之间的相互作用强烈搅拌液体，并增强了对流热传递。通过通过图像分析划分热通量分布，发现对流传热是主要的壁传热模式，并且微层与面积覆盖率相对于总传热面积小于10％的贡献是小，约25％。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第5期|121006.1-121006.16|共16页
  • 作者

    Takanori Tanaka; Koji Miyazaki; Tomohide Yabuki;

  • 作者单位

    Department of Mechanical and Control Engineering. Kyushu Institute of Technology. 1-1 Sensui-cho. Tobata-ku Kitakyushu Fukuoka 804-8550 Japan;

    Department of Mechanical and Control Engineering. Kyushu Institute of Technology. 1-1 Sensui-cho. Tobata-ku Kitakyushu Fukuoka 804-8550 Japan;

    Department of Mechanical and Control Engineering. Kyushu Institute of Technology. 1-1 Sensui-cho. Tobata-ku Kitakyushu Fukuoka 804-8550 Japan;

  • 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; Water; High-speed IR thermometry; Heat transfer mechanisms; Microlayer;

    机译：池沸腾;水;高速IR温度;传热机制;微层次;

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