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首页> 外文期刊>Journal of Heat Transfer >Visual Onset of Nucleate Boiling in Water Spray Cooling on Hot Steel Plate
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Visual Onset of Nucleate Boiling in Water Spray Cooling on Hot Steel Plate

机译：热钢板水喷雾冷却中形核沸腾的视觉开始

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摘要

The onset of nucleate boiling in water spray cooling on hot steel plate was investigated by a simultaneous boiling visualization and heat transfer measurement. The boiling phenomena were visualized with 4K video camera and the surface temperature of the hot steel plate was determined by solving 2-D inverse heat conduction during water spray cooling. The temperature was measured by a sampling rate of 10 data/sec. The hot steel plate was initially heated up to 900℃ and the coolant temperature was kept at a constant temperature of 20℃. The spray nozzle with fullcone pattern was mounted with the three different heights (100, 200 and 300 mm). The more spray height was increased, the more scattered the spray pattern became, which could affect the partial spray intensity and overall cooling uniformity. The lower spray nozzle height of 100 mm shows the steep temperature gradient in inner zone. As the spray particles are more intense at inner zone which wets faster than outer zone. But the higher spray nozzle height of 300 mm, the temperature profile keeps constant within the 400 sec. After this time, the outer zone is wetted faster than inner zone. At the middle height of 200 mm, although the temperature gradient in inner zone is slightly higher than that in outer zone, the overall surface wetting is relatively uniform in the inner and outer zone. These results exhibit that the spray cooling uniformity can be controlled with optimized spray nozzle height. Furthermore the boiling visualization agrees well with the onset of nucleate boiling in surface temperature profiles.
机译：通过同时进行沸腾可视化和传热测量，研究了在热钢板上水喷雾冷却中核沸腾的发生。用4K摄像机可视化沸腾现象，并通过解决喷水冷却过程中的二维逆热传导来确定热钢板的表面温度。通过10数据/秒的采样率测量温度。首先将热钢板加热到900℃，并将冷却液温度保持在20℃的恒定温度。具有全锥图案的喷嘴以三个不同的高度（100、200和300 mm）安装。喷雾高度增加得越多，喷雾模式越分散，这可能会影响部分喷雾强度和总体冷却均匀性。较低的100 mm喷嘴高度显示出内部区域的陡峭温度梯度。由于喷雾颗粒在内部区域比在外部区域更湿润，因此内部区域更强烈。但是较高的喷嘴高度为300毫米，温度曲线在400秒内保持恒定。在此时间之后，外部区域的润湿速度快于内部区域。在200 mm的中间高度处，尽管内部区域的温度梯度略高于外部区域的温度梯度，但内部和外部区域的整体表面润湿相对均匀。这些结果表明，可以通过优化的喷嘴高度来控制喷雾冷却均匀性。此外，沸腾可视化与在表面温度曲线中发生核沸腾非常吻合。

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  • 来源
    《Journal of Heat Transfer》 |2017年第2期|020912.1-020912.1|共1页
  • 作者

    Jungho Lee; Sang Gun Lee; Jinsub Kim;

  • 作者单位

    Department of Extreme Thermal Systems, Korea Institute of Machinery and Materials, Daejeon, 34103, Korea;

    School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, 08826, Korea;

    Department of Extreme Thermal Systems, Korea Institute of Machinery and Materials, Daejeon, 34103, 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
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