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首页> 外文期刊>International Journal of Heat and Mass Transfer >Condensation heat transfer characteristics of R134a flowing inside mini circular and flattened tubes
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Condensation heat transfer characteristics of R134a flowing inside mini circular and flattened tubes

机译：R134a在微型圆形扁平管内流动的冷凝传热特性

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摘要

The condensation heat transfer characteristics of R134a flowing in a circular tube and 3 flattened copper tubes are investigated. The flattened tubes were made from round tubes with a 3.51 mm inner diameter. The tested tube configurations were as follows: a circular tube with a 3.51 mm inner diameter; flattened tube with a 0.72 aspect ratio (FT1); flattened tube with a 3.49 aspect ratio (FT2); and flattened tube with a 7.02 aspect ratio (FT3). The experimental ranges covered a mass flux of 350-900 kg/m~2 s, heat flux of 10-50kW/m~2, inlet quality of 0.1-0.9, and saturation pressure of 8-12 bars. The flow pattern map was initially investigated by comparing it with existing well-known flow pattern maps. Except for some of the results obtained from FT1, most of the experimental data for all of the tested tubes fell into the categories of semiannular and annular flow patterns. The results revealed that the condensation heat transfer coefficient increased with increasing mass flux, heat flux, and vapor quality. The heat transfer coefficients of the flattened tubes were higher than that of the circular tube, around 5-10%, 10-50%, and 200-400% for FT1, FT2, and FT3, respectively. The existing correlations for predicting the heat transfer coefficient were not successful for the flattened tubes. A new correlation was proposed for practical applications.
机译：研究了R134a在圆形管和3个扁平铜管中流动的冷凝传热特性。扁平管由内径为3.51 mm的圆管制成。所测试的管配置如下：内径为3.51 mm的圆形管；长宽比为0.72（FT1）的扁平管；扁平管，长宽比为3.49（FT2）；扁平管的长宽比为7.02（FT3）。实验范围包括质量通量为350-900 kg / m〜2 s，热通量为10-50kW / m〜2，入口质量为0.1-0.9，饱和压力为8-12 bar。最初通过将流图与现有的众所周知的流图进行比较来对其进行研究。除了从FT1获得的一些结果外，所有被测管的大多数实验数据都属于半环形和环形流型。结果表明，冷凝传热系数随质量通量，热通量和蒸汽质量的增加而增加。扁平管的传热系数高于圆形管，对于FT1，FT2和FT3分别约为5-10％，10-50％和200-400％。对于扁平管，用于预测传热系数的现有相关性并不成功。为实际应用提出了一种新的相关性。

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  • 作者

    Jatuporn Kaew-On; Nunthaphan Naphattharanun; Ronee Binmud; Somchai Wongwises;

  • 作者单位

    Department of Mechanical Engineering, Faculty of Engineering, Thaksin University, Phattalung 93210, Thailand;

    Department of Mechanical Engineering, Faculty of Engineering, Thaksin University, Phattalung 93210, Thailand;

    Department of Physics, Faculty of Science, Thaksin University, Phattalung 93210, Thailand;

    Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab. (FUTURE), Department of Mechanical Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, Bangmod, Bangkok 10140, Thailand;

  • 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

    Condensation; Heat transfer coefficient; Flattened tube; R134a;

    机译：缩合;传热系数;扁平管;R134a;

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