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Application of Combined Enhanced Techniques for Design of Highly Efficient Air Heat Transfer Surface

机译：组合增强技术在高效空气传热面设计中的应用

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摘要

In order to reduce the size and cost of heat exchangers, an air-side wavy fin-and-tube heat transfer surface with three-row tubes needs to be replaced by two-row tubes with some appropriate enhancing techniques. The major purpose of the present paper is to search for such new structure by numerical simulation. First, longitudinal vortex generators of Delta-winglet type are tried. The influence of number and of arrangement of the winglets on the performance of the heat transfer surface is studied in detail. The numerical results show that the fin with two winglets aligned spanwise in the front and rear of each tube (Fin W6) has higher heat transfer capability than other enhanced structures with vortex generators, but it still unable to meet the heat transfer requirement. Then a combination design of the longitudinal vortex generator with slotted protruding parallel strips is proposed and different variations of their arrangement are tried. Finally we come to such a combination (C3), which is based on Fin W6 with additional eight protruding strips situated at five positions (grouped by 1, 2, 2, 2, and 1) along the flow direction. Fin C3 can satisfy the requirements for heat transfer rate of the original wavy fin of three-row tubes with a mild increase in pressure drop, and its volume and material reduce to about 67% of the original one.
机译：为了减小热交换器的尺寸和成本，具有三排管的空气侧波浪形翅片管传热表面需要由具有适当的增强技术的两排管代替。本文的主要目的是通过数值模拟来寻找这种新结构。首先，尝试了三角翼小翼型的纵向涡流发生器。详细研究了小翼的数量和布置对传热表面性能的影响。数值结果表明，与每个带有涡流发生器的增强型结构相比，在每个管子的前后（翼W6）具有沿翼展方向对齐的两个小翼的翅片具有更高的传热能力，但仍不能满足传热要求。然后，提出了纵向涡流发生器与开缝突出的平行带的组合设计，并尝试了其布置的不同变化。最终，我们得出了这样的组合（C3），它基于Fin W6，并在流动方向上位于五个位置（由1、2、2、2和1分组）的另外八个凸条上。翅片C3可以满足三排管原始波浪形翅片的传热率要求，且压降略有增加，并且其体积和材料减少到原始翅片的67％左右。

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  • 来源
    《Heat Transfer Engineering》 |2012年第3期|p.52-62|共11页
  • 作者

    JU-FANG FAN; YA-LING HE; WEN-QUAN TAO;

  • 作者单位

    Key Laboratory of Thermo-Fluid Science & Engineering, School of Energy & Power Engineering, Xi'an Jiaotong University,Xi'an, China;

    Key Laboratory of Thermo-Fluid Science & Engineering, School of Energy & Power Engineering, Xi'an Jiaotong University,Xi'an, China;

    Key Laboratory of Thermo-Fluid Science & Engineering, School of Energy & Power Engineering,Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi 710049,China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    a: winglet length, m; b: winglet height, m; c_p: specific heat, kJ kg~(-1) K~(-1); F_p: fin pitch, m; L_a: location parameter of strip, m; et al;

    机译：a：小翼长度;m;b：小翼高度;m;c_p：比热;kJ kg〜（-1）K〜（-1）;F_p：鳍间距;m;L_a：条带的位置参数;m;等;

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