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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：具有一，二，三和四行风管的波浪形翅片的传热和压降机理

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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：波浪状翅片是制冷工业中使用的紧凑型热交换器中最受欢迎的翅片之一。与板状翅片相比，波浪状翅片负责传热和压降的机理完全不同。波角，翅片间距，翅片厚度，华夫饼尺寸，管的行数和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以显着改善鳍片性能。波浪翅片的传热和压降机理的完整理解对于换热器设计者来说非常重要。这项工作涉及具有一排，两排，三排或四排管的波浪状翅片的热工液压性能。根据热交换器通道的水力直径，雷诺数始终在层流状态内，范围从200到2000。可以识别传热和压降机制。该方法是使用计算流体动力学进行数值计算的。结合壁和周期条件进行了共轭传热计算。表面上的冲击流，边界层的发展以及管前的马蹄涡旋是确定的传热机制，其中第一个起主要作用。在所研究的模型中，具有一排的模型具有最大的热通量，而鳍片的底部比顶部的性能更好。研究了每个管子传递的热量，发现第二排管子比其余的管子最有效。

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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;热交换器;圆管;

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