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Experimental study on the distribution of local heat transfer coefficient of falling film heat transfer outside horizontal tube

机译：水平管外局部传热系数分布的实验研究

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摘要

An experimental system was built up to measure the outer circumferential distributions of the local heat transfer coefficient of horizontal tube falling film flow. The wall temperature along the angle were measured. Based on the experimental data, the local heat flux distribution on the tube surface were obtained by numerical calculation. The local heat transfer coefficient distribution outside the tube were obtained. The effects of spray density, tube spacing, average heat flux and fluid temperature on local heat transfer coefficient were investigated. The results show that the local heat transfer coefficient decreases sharply with the increase of angle, then decreases steadily, and finally increases slightly. According to the distribution of the local heat transfer coefficient and heat transfer mechanisms, the tube surface is divided into the impingement zone, the heat diffusion transfer zone and the tail detachment zone. The increase of spray density has little influence on the heat transfer in the impact zone, but make the heat transfer increases slightly in the heat diffusion transfer zone and the tail detachment zone. The influence of tube spacing is mainly concentrated in the impingement zone. The heat transfer is enhanced with the increase of tube spacing in the impingement zone. The average heat flux has no obvious effect on heat transfer. With the increase of fluid temperature, the heat transfer is greatly increased all over the cycle. Besides, based on the experimental data, new correlations of local heat transfer coefficient of falling film flow outside a horizontal tube are proposed.
机译：建立了一种实验系统，测量水平管落膜流动局部传热系数的外周分布。测量沿角度的壁温。基于实验数据，通过数值计算获得管表面上的局部热通量分布。获得了管外的局部传热系数分布。研究了喷雾密​​度，管间距，平均热通量和流体温度对局部传热系数的影响。结果表明，随着角度的增加，局部传热系数随着角度的增加而降低，然后稳定地降低，最后略微增加。根据局部传热系数和传热机构的分布，管表面被分成冲击区，热扩散转移区和尾部脱离区域。喷雾密度的增加对冲击区中的传热影响几乎没有影响，但是在热扩散转移区和尾部分离区中使传热略微增加。管间距的影响主要集中在冲击区中。随着冲击区中的管间距的增加，热传递增强。平均热通量对热传递没有明显影响。随着液体温度的增加，传热大大增加了整个循环。此外，基于实验数据，提出了水平管外部局部传热系数的新相关系数。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第5期|121031.1-121031.14|共14页
  • 作者

    Shanlin Liu; Xingsen Mu; Shengqiang Shen; Chao Li; Boyu Wang;

  • 作者单位

    Key Laboratory of Liaoning Province for Desalination School of Energy and Power Engineering Dalian University of Technology Dalian 116024 China;

    Key Laboratory of Liaoning Province for Desalination School of Energy and Power Engineering Dalian University of Technology Dalian 116024 China;

    Key Laboratory of Liaoning Province for Desalination School of Energy and Power Engineering Dalian University of Technology Dalian 116024 China;

    Key Laboratory of Liaoning Province for Desalination School of Energy and Power Engineering Dalian University of Technology Dalian 116024 China;

    Key Laboratory of Liaoning Province for Desalination School of Energy and Power Engineering Dalian University of Technology Dalian 116024 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

    Horizontal tube; Falling film flow; Local heat transfer coefficient; Heat transfer correlation;

    机译：水平管;落叶薄膜流动;局部传热系数;传热相关性;

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