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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer and flow characteristics of air-assisted impinging water jets
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Heat transfer and flow characteristics of air-assisted impinging water jets

机译：空气冲击射流的传热和流动特性

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摘要

The heat transfer performance of circular, air-assisted liquid water jets is experimentally observed over a wide range of physical parameters, including nozzle tube diameter and surface tension. Dimensional analysis is used to identify the parameters of importance. A new correlation of the local Nusselt number is suggested along with a separate correlation of the average Nusselt number for several values of r/D. The new correlations allow for prediction of heat transfer performance over a much broader range of conditions than previously available. Trends in both local and averaged heat transfer are discussed, including the effect of the liquid Weber number which has not been included in any previous analysis. The maximum stagnation point Nusselt number enhancement was 2.6 times the liquid only value. The maximum enhancement of the averaged Nusselt number (at a radius of five tube diameters) was 1.8 times the liquid only value. A clear trend of decreasing averaged heat transfer with increasing liquid Weber number is observed. Flow visualization of the two-phase flow patterns and water splatter are used to explain the observed heat transfer trends. The two-phase flow pattern affects the heat transfer in the region near the stagnation point, but does not affect the radial flow region. An experiment to quantitatively evaluate water splatter was also conducted. Water splatter is shown to correlate well with both gas Reynolds number and liquid Weber number, and has a significant effect on heat transfer outside the impingement region. Finally, optimal operating points for D = 4 mm and 8 mm jets, in terms of the dimensionless pumping power requirement, are observed for several values of r/D.
机译：在各种物理参数（包括喷嘴管直径和表面张力）的实验范围内，可以观察到圆形空气辅助液态水射流的传热性能。维度分析用于识别重要参数。建议使用局部nusselt数的新相关性，以及针对多个r / D值的平均Nusselt数的独立相关性。新的相关性允许在比以前更广泛的条件范围内预测传热性能。讨论了局部传热和平均传热的趋势，包括液体韦伯数的影响，这在以前的任何分析中都没有包括。最大停滞点努塞尔数增强是仅液体值的2.6倍。平均努塞尔数（在五个管直径的半径处）的最大增强是仅液体值的1.8倍。观察到随着液体韦伯数增加而平均传热降低的明显趋势。两相流模式和水流的流动可视化用于解释观察到的传热趋势。两相流动模式影响停滞点附近区域的热传递，但不影响径向流动区域。还进行了定量评估水飞溅的实验。已证明，水飞溅与气体雷诺数和液体韦伯数均具有良好的相关性，并且对撞击区域外的热传递具有显着影响。最后，就无量纲的泵浦功率要求而言，对于几个r / D值，可以观察到D = 4 mm和8 mm喷嘴的最佳工作点。

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  • 作者

    Daniel Trainer; Jungho Kim; Sung Jin Kim;

  • 作者单位

    Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea;

    Dept. of Mechanical Engineering, Univ. of Maryland, College Park, MD, United States;

    Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, 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

    Impinging jet; Liquid cooling; Two-phase jet;

    机译：射流撞击;液体冷却;两相射流;

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