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FALLING FILM EVAPORATION ON SERRATED FIN TUBES

机译：在锯齿状翅片管上脱落膜蒸发

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摘要

This study investigates the falling film evaporation on serrated fin tubes using R134a at 10 degrees C and 20 degrees C saturation temperatures. The serrated fin tube was made by electrical discharge machining. It had 60 annular fins per inch of 0.4 mm fin height, and the tip of each fin had 40 axial cuts. The liquid flowed through a row of circular holes at a mass flow rate per unit length of 0.007-0.04376 kg.m(-1) .s(-1), and heat fluxes between 4.4 and 49.6 kW.m(-2). The test results showed that the heat transfer coefficient of both the smooth tube and the serrated fin tube increased with the heat flux. It also increased slightly with the flow rate before dry-out occurred. The film flow rate had a minor effect on the heat transfer coefficient for smooth tubes. For the serrated fin tube, a lower film Reynolds number resulted in greater falling film evaporation heat transfer coefficients. Based on observations of FC-72 droplets spreading process from high-speed video, the axial cuts improved the fluid distribution uniformity on the serrated fin tube. The serrated fin tube yielded enhancement ratios of up to 10.18 and 6.02 for falling film evaporation of R134a at 10 degrees C and 20 degrees C, respectively, as compared with the smooth tube.
机译：本研究通过10摄氏度和20摄氏度的饱和温度调查使用R134A对锯齿状翅片管的下降膜蒸发。锯齿状翅片管通过电放电加工制成。它具有每英寸0.4毫米的60个环形翅片，每个翅片的尖端具有40个轴向切口。在每单位流量的质量流速下流过一排圆孔，每单位流量为0.007-0.04376kg.m（-1）。（-1），和4.4和49.6kW.m（-2）之间的热通量。测试结果表明，光滑管和锯齿状翅片管的传热系数随热通量而增加。在干燥之前，它也随着流速而略微增加。薄膜流量对光滑管的传热系数有微小的影响。对于锯齿状翅片管，下膜雷诺数导致更大的膜蒸发传热系数。基于对高速视频的FC-72液滴扩散过程的观察，轴向切割改善了锯齿状翅片管上的流体分布均匀性。与光滑的管相比，锯齿状翅片管的增强比率高达10.18和6.02分别在10℃和20摄氏度下蒸发。

著录项

  • 来源
    《Journal of enhanced heat transfer》 |2020年第4期|313-328|共16页
  • 作者

    Chien Liang-Han; Chang Ching-Hung; Huang Hsuan-An;

  • 作者单位

    Natl Taipei Univ Technol Dept Energy & Refrigerating Air Conditioning Engn 1 Sec 3 Chung Hsaio E Rd Taipei 106 Taiwan;

    Natl Taipei Univ Technol Dept Energy & Refrigerating Air Conditioning Engn 1 Sec 3 Chung Hsaio E Rd Taipei 106 Taiwan;

    Natl Taipei Univ Technol Dept Energy & Refrigerating Air Conditioning Engn 1 Sec 3 Chung Hsaio E Rd Taipei 106 Taiwan;

  • 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

    R134a; evaporator; falling film evaporation; tube; enhanced heat transfer;

    机译：R134A;蒸发器;落叶膜蒸发;管;增强的传热;

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