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首页> 外文期刊>International Journal of Heat and Mass Transfer >Two-phase refrigerant distribution in a parallel flow minichannel heat exchanger having horizontal headers
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Two-phase refrigerant distribution in a parallel flow minichannel heat exchanger having horizontal headers

机译：具有水平集管的平行流微通道热交换器中的两相制冷剂分配

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摘要

The refrigerant R-134a flow distributions are experimentally studied for a round header-ten flat tube test section simulating a brazed aluminum heat exchanger. Three different inlet orientations (parallel, normal, vertical) are investigated. Tests are conducted with downward flow for the mass flux from 70 to 130 kg/m~2 s and quality from 0.2 to 0.6. Tubes are protruded to the center of the header. It is shown that the preferred inlet configuration is dependent on mass flux or quality. At low mass flux or quality, vertical inlet yields the best flow distribution, followed by normal and then parallel inlet. As mass flux or quality increases, the optimum configuration switches to normal inlet configuration. As compared with the flush-mounted configuration, more uniform flow distribution is obtained for the present protruded configuration. Possible explanation is provided based on flow visualization results. Correlations are developed to predict the fraction of liquid or gas taken off by downstream channel as a function of header gas Reynolds number at immediate upstream.
机译：在模拟集管式铝热交换器的圆形集管箱十个扁平管测试段中，对制冷剂R-134a的流量分布进行了实验研究。研究了三种不同的入口方向（平行，法向，垂直）。向下测试质量通量为70至130 kg / m〜2 s，质量为0.2至0.6。管突出到集管的中心。结果表明，优选的进气口配置取决于质量流量或质量。在低质量通量或低质量的情况下，垂直入口可产生最佳的流量分布，然后是正常入口，然后是平行入口。随着质量通量或质量的增加，最佳配置将切换为正常进口配置。与齐平安装的构造相比，对于当前的突出构造，获得了更均匀的流量分布。基于流可视化结果提供了可能的解释。建立相关性以预测下游通道作为直接上游的总管雷诺数的函数所排出的液体或气体的比例。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2012年第26期|p.7747-7759|共13页
  • 作者

    Nae-Hyun Kim; Eul-Jong Lee; Ho-Won Byun;

  • 作者单位

    Department of Mechanical Engineering, University of Incheon, 12-1, Songdo-Dong, Yeonsu-Gu, Incheon 406-772, Republic of Korea;

    Department of Mechanical Engineering, University oflncheon, Incheon 406-772, Republic of Korea;

    Department of Mechanical Engineering, University oflncheon, Incheon 406-772, 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 distribution; heat exchanger; header; inlet configuration;

    机译：流量分配;热交换器;标题进气口配置;

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