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首页> 外文期刊>International Journal of Heat and Mass Transfer >The effects of corrugation pitch on the condensation heat transfer coefficient and pressure drop of R-134a inside horizontal corrugated tube
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The effects of corrugation pitch on the condensation heat transfer coefficient and pressure drop of R-134a inside horizontal corrugated tube

机译：波纹节距对水平波纹管内R-134a的冷凝传热系数和压降的影响

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摘要

The heat transfer coefficient and pressure drop of R-134a inside a horizontal smooth tube and corrugated tubes are experimentally investigated. The test section is a 2.0 m long counter-flow concentric double tube heat exchanger with refrigerant flowing in the inner tube and cooling water flowing in the annulus. A smooth tube and corrugated tubes having inner diameters of 8.7 mm are used as an inner tube. The corrugation pitches are 5.08, 6.35, and 8.46 mm, respectively. The corrugation depth of all corrugated tubes is fixed at 1.5 mm. The outer tube is made from smooth copper tube having an inner diameter of 21.2 mm. The test runs are performed at the saturation temperatures of 40, 45, and 50 ℃, heat fluxes of 5 and 10 kW/m~2, and mass fluxes ranging from 200 to 700 kg/m~2 s. The results obtained from the corrugated tubes are compared with that of the smooth tube. It is found that the corrugation pitches have a significant effect on the heat transfer coefficient and pressure drop augmentations.
机译：实验研究了水平光滑管和波纹管内部R-134a的传热系数和压降。测试部分是一个2.0 m长的逆流同心双管热交换器，制冷剂在内管中流动，冷却水在环空中流动。光滑管和内径为8.7mm的波纹管用作内管。波纹间距分别为5.08、6.35和8.46 mm。所有波纹管的波纹深度固定为1.5毫米。外管由内径为21.2毫米的光滑铜管制成。测试运行在40、45和50℃的饱和温度，5和10 kW / m〜2的热通量以及200至700 kg / m〜2 s的质量通量下进行。将波纹管的结果与光滑管的结果进行比较。发现波纹节距对传热系数和压降增大具有显着影响。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2010年第14期|2924-2931|共8页
  • 作者

    Suriyan Laohalertdecha; Somchai Wongwises;

  • 作者单位

    The Joint Graduate School of Energy and Environment (JGSEE), King Mongkut's University of Technology Thonburi, Bangmod, Bangkok 10140, Thailand Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab. (FUTURE), Department of Mechanical Engineering, King Mongkut's University of Technology Thonburi, Bangmod, Bangkok 10140, Thailand;

    Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab. (FUTURE), Department of Mechanical 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; pressure drop; smooth tube; corrugated tube;

    机译：缩合;传热系数压力下降;光滑管波纹管;

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