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首页> 外文期刊>International Journal of Heat and Mass Transfer >Flow patterns and heat transfer characteristics of R-1234ze(E) for downward condensation in a plate heat exchanger
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Flow patterns and heat transfer characteristics of R-1234ze(E) for downward condensation in a plate heat exchanger

机译：R-1234ze（E）的流动模式和传热特性，用于板式换热器中的向下冷凝

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摘要

This study investigates the condensation flow patterns and heat transfer characteristics of a low global warming potential refrigerant R-1234ze(E) for downward flow in a plate heat exchanger through flow visualization. An asymmetric flow aspect for downward condensation is characterized by vapor- and liquid-preferred paths owing to the effect of gravity. Flow patterns for downward condensation are classified into two regimes: steady film flow without intermittent flooding and pulsating film flow involving intermittent flooding. Additionally, the condensation heat transfer coefficient and frictional pressure drop were analyzed considering flow patterns. Intermittent flooding is hardly related to the heat transfer performance. A frequency analysis of the pressure drop exhibited a considerable difference in periodic characteristics between the flow regimes with and without intermittent flooding. Finally, the visualization data coincided with the flow pattern map proposed by the existing study, and an empirical correlation for predicting the flow transition between pulsating and steady film flow was developed in terms of the Weber number.
机译：该研究通过流量可视化研究了低全球变暖潜在制冷剂R-1234ze（e）的低全球变暖潜在制冷剂R-1234ze（e）的冷凝流动图案和传热特性。向下冷凝的不对称流动方面的特征在于由于重力的效果而受到气相和液体优选的路径。向下冷凝的流动模式分为两种制度：稳定的薄膜流动而没有间断的洪水和脉动薄膜流动涉及间歇洪水。另外，考虑到流动模式，分析了冷凝传热系数和摩擦压降。间歇性洪水与传热性能几乎不相关。压降的频率分析表现出具有和不间断的洪水间歇性的流动制度之间的周期性特征差异。最后，根据现有研究提出的流动模式图的可视化数据以及用于预测脉动和稳定膜流量之间的流动转变的经验相关性就是在韦伯号方面开发。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第8期|121373.1-121373.16|共16页
  • 作者

    DongChan Lee; Sungho Yun; JunYoung Choi; Yongchan Kim;

  • 作者单位

    Department of Mechanical Engineering Korea University Anam-ro 145 Seongbuk-gu Seoul 02841 Republic of Korea;

    Transportation Environmental Research Team Korea Railroad Research Institute Uiwang-si Gyeonggi-do 16105 Republic of Korea;

    Department of Mechanical Engineering Korea University Anam-ro 145 Seongbuk-gu Seoul 02841 Republic of Korea;

    Department of Mechanical Engineering Korea University Anam-ro 145 Seongbuk-gu Seoul 02841 Republic of Korea;

  • 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; Condensation; Plate heat exchanger; R-1234ze(E); Low GWP;

    机译：流动模式;缩合;板式换热器;r-1234ze（e）;低gwp.;

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