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首页> 外文期刊>Journal of Heat Transfer >The Effectiveness of Secondary Flow Produced by Vortex Generators Mounted on Both Surfaces of the Fin to Enhance Heat Transfer in a Flat Tube Bank Fin Heat Exchanger
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The Effectiveness of Secondary Flow Produced by Vortex Generators Mounted on Both Surfaces of the Fin to Enhance Heat Transfer in a Flat Tube Bank Fin Heat Exchanger

机译：安装在翅片两个表面上的涡流发生器产生的二次流的效率，以增强扁平管束翅片热交换器中的传热

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摘要

Secondary flow is the flow in the cross section normal to the main flow. It plays an important role on the enhanced heat transfer and in the applications in other fields. Secondary flow can greatly enhance the convective heat transfer. In order to find the effectiveness of secondary flow for heat transfer enhancement, a nondimensional parameter, Se, based on the absolute vorticity flux is reported to specify the intensity of secondary flow. Its physical meaning is the ratio of inertial force to viscous force induced by secondary flow. As an example, the effectiveness of secondary flow was numerically studied for a flat tube bank fin heat exchanger with vortex generators (VGs) mounted on both surfaces of the fin. The contributions of VGs are investigated for the enhancements of secondary flow intensity, convective heat transfer, and pressure drop. The method is demonstrated using Se to find out the optimum configurations of VGs. The results reveal that close relationships exist not only between the span-average nondimensional intensity of secondary flow and the span-average Nusselt number but also between the volume average nondimensional intensity of secondary flow and the overall average Nusselt number. For the configuration studied, a ratio of Nusselt number enhancement to the friction factor enhancement increases with increasing the enhancement of secondary flow intensity. As a supplement to traditional criteria on a good performance heat transfer surface, the nondimensional intensity of secondary flow can be used clearly for an optimum value of VG parameter.
机译：二次流是垂直于主流的横截面中的流。它在增强传热和其他领域的应用中起着重要作用。二次流可以大大增强对流传热。为了找到二次流对增强传热的有效性，报告了基于绝对涡度通量的无量纲参数Se来指定二次流的强度。它的物理含义是由二次流引起的惯性力与粘性力之比。例如，对于在翅片两个表面均装有涡流发生器（VG）的扁平管束翅片热交换器，对二次流的有效性进行了数值研究。研究了VG的作用，以增强二次流强度，对流传热和压降。演示了使用Se找出VG最佳配置的方法。结果表明，不仅二次流的跨度平均无量纲强度与平均努氏数之间存在密切关系，而且二次流的体积平均无量纲强度与整体平均努氏数之间存在密切关系。对于所研究的构造，随着二次流强度的增强，努塞尔数增强与摩擦系数增强的比值增加。作为对传热性能良好的传统标准的补充，二次流的无量纲强度可以清楚地用于VG参数的最佳值。

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  • 来源
    《Journal of Heat Transfer》 |2013年第4期|041902.1-041902.11|共11页
  • 作者

    Ke-Wei Song; Liang-Bi Wang;

  • 作者单位

    Key Laboratory of Railway Vehicle Thermal Engineering, Lanzhou Jiaotong University, Ministry of Education, Lanzhou, 730070, PRC Department of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, 730070, PRC;

    Key Laboratory of Railway Vehicle Thermal Engineering, Lanzhou Jiaotong University, Ministry of Education, Lanzhou, 730070, PRC Department of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, 730070, PRC;

  • 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

    secondary flow; intensity of secondary flow; nondimensional parameter; absolute vorticity flux; heat transfer enhancement;

    机译：二次流二次流动强度;无量纲参数绝对涡度通量传热增强;

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