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首页> 外文期刊>Clean air >HEAT TRANSFER AND PRESSURE DROP MECHANISMS IN WAVY FINS HAVING ONE, TWO, THREE, AND FOUR ROWS OF TUBES
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HEAT TRANSFER AND PRESSURE DROP MECHANISMS IN WAVY FINS HAVING ONE, TWO, THREE, AND FOUR ROWS OF TUBES

机译：具有一个，两个，三个和四排管的波纹翅片中的传热和压降机制

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摘要

Wavy fins are one of the most popular fins in compact heat exchangers used in the refrigeration industry. The mechanisms responsible for heat transfer and pressure drop with wavy fins are quite different when compared to plate fins. The wave angle, fin pitch, fin thickness, waffle size, the number of the rows of tubes, and tube pitches are the parameters that decide the performance of the heat exchanger surface. Minimal modifications of these parameters could produce significant improvement in the fin performance. A complete understanding of both heat transfer and pressure drop mechanisms with wavy fins is very important for heat exchanger designers. This work deals with thermal-hydraulic performance of wavy fins having one, two, three or four rows of tubes. The Reynolds number, based on the hydraulic diameter of the channel of a heat exchanger, is always inside the laminar regime, ranging from 200 to 2000. Heat transfer and pressure drop mechanisms are identified. The approach is numerical, using Computational Fluid Dynamics. A conjugate heat transfer calculation with coupling walls and periodic conditions was implemented. The impingement flow on surfaces, boundary layer development, and horseshoe vortex in front of the tube were the identified heat transfer mechanisms, with the first one playing a major role. Among the models studied, the model having one row has the largest heat flux, with the bott om side of the fin having a better performance than the top side. The heat transferred by each tube was investigated, and the second row of tubes was found as most effective when compared to the rest.
机译：波浪鳍是制冷工业中使用的紧凑型换热器中最流行的翅片之一。与板翅片相比，负责热传递和压力下降的机制与波纹翅片相比是完全不同的。波角，翅片间距，翅片厚度，华夫饼尺寸，管排的数量，以及管间距是决定热交换器表面性能的参数。这些参数的最小修改可能会产生显着改善Fin性能。对具有波纹翅片的传热和压降机制完全了解热交换器设计师非常重要。这项工作涉及具有一个，两个，三或四排管的波浪翅片的热液压性能。基于热交换器的通道的液压直径的雷诺数总是在层内制度内，范围为200至2000.鉴定了传热和压降机制。这种方法是使用计算流体动力学的数值。实施了具有耦合壁和周期性条件的共轭传热计算。在管前面的表面，边界层开发和马蹄形涡流上的冲击流是识别的传热机制，第一个发挥着重要作用。在研究的模型中，具有一排的模型具有最大的热量通量，具有比顶侧更好的性能的翅片的圆形侧面。研究了每个管传递的热量，并且与其余部分相比，第二排管被发现是最有效的。

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  • 来源
    《Clean air》 |2018年第2期|49-65|共17页
  • 作者

    Ruben Borrajo Perez; Juan J. Gonzalez;

  • 作者单位

    Technological University of Havana Jose Antonio Echeverria. CETER. 114 Street #11901 ZIP 19390 Havana Cuba;

    Technological University of Havana Jose Antonio Echeverria. CETER. 114 Street #11901 ZIP 19390 Havana Cuba;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    wavy fin; heat exchanger; round tubes;

    机译：波浪翅片;换热器;圆形管;

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