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首页> 外文期刊>International Journal of Heat and Mass Transfer >Performance enhancement of a louvered fin heat exchanger by using delta winglet vortex generators
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Performance enhancement of a louvered fin heat exchanger by using delta winglet vortex generators

机译：使用三角翼小涡流发生器提高百叶窗式翅片换热器的性能

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摘要

Louvered fin and round tube heat exchangers are widely used in air conditioning devices and heat pumps. In this study the effect of punching delta winglet vortex generators into the louvered fin surface in the near wake region of each tube was numerically investigated using computational fluid dynamics (CFD). The delta winglets serve to reduce the size of the tube wakes. They cause three important mechanisms of heat transfer enhancement. First, due to the swirling motion of the generated vortices, hot air is removed from the tube wake to the mainstream regions and vice versa. Second, the induced wall-normal flow locally thins the boundary layer, which also enhances the heat transfer. Third, the size of the wake zones is reduced because the flow separation from the tube surface is delayed. This also results in a reduced form drag of the tube surface. The net core pressure drop, however, increases when adding delta winglets to the louvered fins because of increased friction and flow blockage. For the same heat duty and pumping power, the louvered fin heat exchanger with delta winglets is more compact than when no delta winglets are present.
机译：百叶窗式翅片和圆管热交换器广泛用于空调设备和热泵中。在这项研究中，使用计算流体动力学（CFD）数值研究了在每个管的近尾流区域中将三角翼小涡流发生器打入百叶窗式鳍片表面的效果。三角翼小翼用于减小尾流管的尺寸。它们导致增强传热的三个重要机制。首先，由于产生的涡旋运动，热风从管尾流移到主流区域，反之亦然。其次，诱导的壁法向流动局部使边界层变薄，这也增强了热传递。第三，由于延迟了从管表面的流动分离，因此减小了尾流区的尺寸。这也导致管表面的形式阻力减小。但是，当将三角翼小翼添加到百叶窗式翅片时，由于增加的摩擦力和流阻，净核心压降会增加。对于相同的热负荷和泵送功率，带有三角翼小翼的百叶窗式翅片热交换器比没有三角翼小翼的情况更紧凑。

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  • 来源
  • 作者

    Henk Huisseune; Christophe TJoen; Peter De Jaeger; Bernd Ameel; Sven De Schampheleire; Michel De Paepe;

  • 作者单位

    Ghent University, Department of Flow, Heat and Combustion Mechanics, Sint-Pietersnieuwstraat 41, 9000 Cent, Belgium;

    Ghent University, Department of Flow, Heat and Combustion Mechanics, Sint-Pietersnieuwstraat 41, 9000 Cent, Belgium;

    Ghent University, Department of Flow, Heat and Combustion Mechanics, Sint-Pietersnieuwstraat 41, 9000 Cent, Belgium,NVBekaert SA, Bekaertstraat 2, 8550 Zwevegem, Belgium;

    Ghent University, Department of Flow, Heat and Combustion Mechanics, Sint-Pietersnieuwstraat 41, 9000 Cent, Belgium;

    Ghent University, Department of Flow, Heat and Combustion Mechanics, Sint-Pietersnieuwstraat 41, 9000 Cent, Belgium;

    Ghent University, Department of Flow, Heat and Combustion Mechanics, Sint-Pietersnieuwstraat 41, 9000 Cent, Belgium;

  • 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

    louvered fin; vortex generator; longitudinal vortex; heat transfer enhancement; numerical;

    机译：百叶鳍涡流发生器纵向涡流传热增强;数值的;

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