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Visualization Study of Steam Condensation in Rectangular Channel of Multichannel Cylinder Dryer

机译：多通道圆筒干燥机矩形通道内蒸汽凝结的可视化研究

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摘要

The phenomenon of steam condensation occurring on one surface in a rectangular horizontal channel was experimentally studied. The experiment was conducted using a visualization method with a steam quality of 0.1-0.9 and mass flux of 20-50 kg/m~2 s. Four flow patterns (annular, wave, slug, and plug) were observed, and the effects of quality and mass flux on the condensing heat transfer were analyzed. The mass flux and steam quality primarily affect the condensing heat transfer coefficient in the shear-dominated flow regime. The condensing heat transfer coefficients are nearly constant only in a certain range of steam quality. This result is disparate from what has been reported in previous literatures. It was also observed that the condensing heat transfer coefficient rises with an increase in the quality. Two flow regime maps were employed to predict the flow regimes observed in this study. The result reveals that the Tandon flow regime map agrees quite well with the experimental results.
机译：实验研究了在矩形水平通道的一个表面上发生的蒸汽凝结现象。使用可视化方法进行实验，蒸汽质量为0.1-0.9，质量通量为20-50 kg / m〜2 s。观察到了四种流动形式（环形，波状，弹状和塞状），并分析了质量和质量通量对冷凝传热的影响。在剪切控制的流动状态下，质量通量和蒸汽质量主要影响冷凝传热系数。冷凝传热系数仅在一定的蒸汽质量范围内几乎恒定。该结果与先前文献中报道的结果不同。还观察到，冷凝传热系数随着质量的增加而增加。使用两个流动状态图来预测本研究中观察到的流动状态。结果表明，Tandon流态图与实验结果非常吻合。

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  • 来源
    《Journal of Heat Transfer》 |2017年第5期|054503.1-054503.5|共5页
  • 作者

    Yan Yan; Dong Jixian; Tang Wei; Feng Shiyu;

  • 作者单位

    College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China;

    College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China;

    College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China;

    College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, 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

    visualization; flow; condensation; heat transfer; rectangular horizontal channel; multichannel cylinder dryer;

    机译：可视化;流动;冷凝;传热;矩形水平通道;多通道圆筒干燥机;

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