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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical study of heat-transfer enhancement by punched winglet-type vortex generator arrays in fin-and-tube heat exchangers
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Numerical study of heat-transfer enhancement by punched winglet-type vortex generator arrays in fin-and-tube heat exchangers

机译：翅片管式换热器中冲孔小翼型涡流发生器阵列强化传热的数值研究

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摘要

The potential of punched winglet type vortex generator (VC) arrays used to enhance air-side heat-trans fer performance of finned tube heat exchanger is numerically investigated. The arrays are composed of two delta-winglet pairs with two layout modes of continuous and discontinuous winglets. The heat transfer performance of two array arrangements are compared to a conventional large winglet configu ration for the Reynolds number ranging from 600 to 2600 based on the tube collar diameter, with the corresponding frontal air velocity ranging from 0.54 to 2.3 m/s. The effects of different geometry param eters that include attack angle of delta winglets (β = 10 deg, β = 20 deg, β = 30 deg) and the layout loca tions are examined. The numerical results show that for the punched VG cases, the effectiveness of the main vortex to the heat transfer enhancement is not fully dominant while the "corner vortex" also shows significant effect on the heat transfer performance. Both heat transfer coefficient and pressure drop increase with the increase of attack angle β for the side arrangements; the arrays with discontinuous winglets show the best heat transfer enhancement, and a significant augmentation of up to 33.8-70.6% in heat transfer coefficient is achieved accompanied by a pressure drop penalty of 43.4-97.2% for the 30 deg case compared to the plain fin. For the front arrangements of VGs higher heat trans fer enhancement and pressure drop penalty can be obtained compared to that of the side arrangement cases; the case with front continuous winglet arrays has the maximum value of j/f, a corresponding heat transfer improvement of 36.7-81.2% and a pressure drop penalty of 60.7-135.6%.
机译：数值研究了用于增强翅片管热交换器空气侧传热性能的冲孔小翼型涡流发生器（VC）阵列的潜力。阵列由两个三角翼小翼对组成，两个三角翼小翼对具有连续和不连续小翼的两种布局模式。根据管颈直径，将两个阵列布置的传热性能与雷诺数范围为600到2600的常规大型小翼配置进行了比较，相应的正面风速范围为0.54到2.3 m / s。检查了包括三角翼小翼的迎角（β= 10度，β= 20度，β= 30度）和布局位置的不同几何参数的影响。数值结果表明，对于穿孔的VG情况，主涡流对强化传热的有效性并不完全占优势，而“角涡”对传热性能也具有显着影响。对于侧面布置，传热系数和压降都随着迎角β的增加而增加；具有不连续小翼的阵列显示出最佳的传热增强，与普通翅片相比，在30度情况下，传热系数显着提高了33.8-70.6％，并伴有43.4-97.2％的压降损失。与侧面布置的情况相比，对于VG的正面布置，可以获得更高的传热增强和压降损失。前连续小翼阵列的情况具有j / f的最大值，相应的传热改进为36.7-81.2％，压降损失为60.7-135.6％。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2012年第22期|p.5449-5458|共10页
  • 作者

    Y.L. He; H. Han; W.Q. Tao; Y.W. Zhang;

  • 作者单位

    Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China;

    Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China;

    Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China;

    Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China,Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65211, USA;

  • 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

    fin-and-tube heat exchanger; vortex generator array; heat transfer enhancement;

    机译：翅片管换热器;涡流发生器阵列;传热增强;

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