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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental study on the distribution of constituents of binary zeotropic mixtures in vertical impacting T-junction
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Experimental study on the distribution of constituents of binary zeotropic mixtures in vertical impacting T-junction

机译：垂直冲击T型结中二元共沸混合物成分分布的实验研究

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摘要

In this paper, the distributions of constituents of binary zeotropic mixtures, R134a/R245fa, at vertical impacting T-junctions were investigated experimentally. An online measurement method with a Coriolis mass flow meter was used for identifying liquid-phase mixture composition. The effects of inlet conditions, such as vapor quality, mass flux and refrigerant composition, as well as outlet conditions, such as the outlet to inlet flow ratio and outlet tube diameter, on the constituent separation performance were investigated and compared based on a wide range of test conditions. The relationship between constituent distribution and phase distribution was also discussed based on the degree of deviation from the ideal separation process. During the experiments, R134a/R245fa zeotropic mixture with an R134a mass fraction of 0.3215 shows the largest variation range of R134a mass fraction from 0.2717 to 0.3492 at the T-junction outlet. In the T-junction with an outlet-inlet tube diameter ratio of 0.457, the mixture having an R134a mass fraction of 0.7075 shows the best constituent separation performance under test condition of 0.49 vapor quality and 200 kg m~(-1) s~(-1) mass flux with an outlet-inlet mass flow ratio of 0.5. It was found that the pressure across the T-junction plays an important role on the mal-distribution of constituents. Therefore, increase of the mass fraction of R245fa would lead to the increase of pressure drop, so deteriorating the constituent separation performance.
机译：本文研究了二元共沸混合物R134a / R245fa在垂直冲击T型结处的分布。使用具有科里奥利质量流量计的在线测量方法来识别液相混合物组成。在宽范围内，研究并比较了入口条件（如蒸气质量，质量通量和制冷剂成分）以及出口条件（如出口与入口的流量比和出口管的直径）对成分分离性能的影响。测试条件。基于与理想分离过程的偏离程度，还讨论了成分分布和相分布之间的关系。在实验过程中，R134a质量分数为0.3215的R134a / R245fa共沸混合物在T型结出口处的R134a质量分数变化范围最大，从0.2717到0.3492。在出口管直径比为0.457的T型接头中，R134a质量分数为0.7075的混合物在0.49蒸气质量和200 kg m〜（-1）s〜（ -1）出口质量流量比为0.5的质量通量。已发现，跨T形结的压力在成分分布不均方面起着重要作用。因此，R245fa的质量分数的增加将导致压降的增加，从而使成分分离性能恶化。

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  • 作者

    Nan Zheng; Yunho Hwang; Li Zhao; Shuai Deng;

  • 作者单位

    Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, Tianjin University, MOE, Tianjin 300072, China;

    Center for Environmental Energy Engineering, University of Maryland College Park, 4164 Glenn Martin Hall Bldg., MD 20742, USA;

    Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, Tianjin University, MOE, Tianjin 300072, China;

    Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, Tianjin University, MOE, Tianjin 300072, China;

  • 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

    Impacting T-junction; Zeotropic mixture; Constituent distribution; Two-phase flow;

    机译：冲击丁字路口;共沸混合物;成分分布;两相流;

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