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首页> 外文期刊>International Journal of Heat and Mass Transfer >Flow pattern visualization and heat transfer characteristics of R-134a during condensation inside a smooth tube with different tube inclinations
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Flow pattern visualization and heat transfer characteristics of R-134a during condensation inside a smooth tube with different tube inclinations

机译：R-134a在具有不同管子倾角的光滑管子内冷凝期间的流动模式可视化和传热特性

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摘要

Experimental investigations are conducted herein to study the heat transfer and observe the condensation flow patterns of refrigerant R-134a inside a single smooth tube. The test apparatus makes the tube capable of having different inclination angles, 'a'. The experiments are performed for seven different tube inclinations in the range of -90° to +90° and six refrigerant mass velocities between 53 and 212 kg/m2 s for each tube inclination angle. It is observed that the tube inclination noticeably influences the vapor and condensed liquid distribution, and also the condensation heat transfer coefficient. Eight different flow regimes have been observed during condensation inside a smooth tube with different tube inclinations. In the case of condensation heat transfer, the best performance is achieved by the tube with inclination angle of +30° (for all refrigerant mass velocities). The effect of inclination angle on heat transfer coefficient, h, is more prominent at low vapor quality and mass flux. Finally, an empirical correlation has also been developed to predict the heat transfer coefficient during condensation inside a smooth tube with different tube inclinations.
机译：本文进行了实验研究，以研究传热并观察制冷剂R-134a在单个光滑管内的冷凝流动模式。该测试设备使管能够具有不同的倾斜角“ a”。实验是针对-90°至+ 90°范围内的七个不同的管道倾斜度以及每个管道倾斜角度在53至212 kg / m2 s之间的六个制冷剂质量速度进行的。可以看出，管子的倾斜度显着影响蒸汽和冷凝液的分布，也影响冷凝液的传热系数。在具有不同管倾斜度的光滑管内冷凝期间，观察到八种不同的流态。在冷凝传热的情况下，倾斜角度为+ 30°的管（对于所有制冷剂质量速度）都可实现最佳性能。倾斜角对传热系数h的影响在低蒸汽质量和低质量通量的情况下更为突出。最后，还建立了经验相关性，以预测在具有不同管子倾角的光滑管子内部冷凝期间的传热系数。

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  • 来源
  • 作者

    S.G. Mohseni; M.A. Akhavan-Behabadi; M. Saeedinia;

  • 作者单位

    Center of Excellence in Design and Optimization of Energy Systems, School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran;

    Center of Excellence in Design and Optimization of Energy Systems, School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran;

    Center of Excellence in Design and Optimization of Energy Systems, School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran;

  • 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

    flow pattern; heat transfer; condensation; smooth tube; R-134a; inclination;

    机译：流型传播热量;缩合;光滑管R-134a;倾角;

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