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Experimental Study of Passive Heat Transfer Enhancement in a Drag-Reducing Flow

机译:减阻流中被动传热增强的实验研究

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摘要

Drag and heat transfer reduction were examined in a fully developed two-dimensional drag-reducing flow with different concentrations of surfactant additives. A row of low-profile mixers was used to enhance heat transfer in the flow. The effect of the low-profile mixers on heat transfer enhancement was examined in terms of the local Nusselt number for the surfactant concentration of 90 ppm. A comparison of the cases with and without low-profile mixers show that the average Nusselt number is enhanced by about 170% for Reynolds numbers of 7000, 12000, and 16200 with only a small pressure drop penalty. This increase in heat transfer performance might be related to the longitudinal vortices generated by the low-profile mixers, resulting in the enhancement of the bulk exchange of fluid between the main flow and the near-wall region. It was found that the enhancement of the low-profile mixers to the heat transfer rate starts to deteriorate in the streamwise direction at a certain location downstream of the mixers. The location of the onset of the deterioration shifts downstream with an increase in the Reynolds number.
机译:在具有不同浓度的表面活性剂添加剂的完全展开的二维减阻流中,检查了减阻和传热减少。使用一排低调的混合器来增强流中的热传递。根据表面活性剂浓度为90 ppm的局部Nusselt值,检查了低调混合器对传热的影响。带有和不带有低调混音器的情况的比较表明,雷诺数7000、12000和16200的平均Nusselt数增加了约170%,而压降损失却很小。传热性能的这种提高可能与低剖面混合器产生的纵向涡流有关,从而导致主流和近壁区域之间的流体大量交换得到增强。已经发现,低轮廓混合器对传热速率的增强在混合器下游的某个位置沿流向开始恶化。随着雷诺数的增加,变质开始的位置向下游移动。

著录项

  • 来源
    《Heat Transfer Engineering》 |2007年第1期|p.9-18|共10页
  • 作者

    K. H. YEO; T. ZHOU; K. C. LEONG;

  • 作者单位

    School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore;

  • 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 工业用热工设备;
  • 关键词

  • 入库时间 2022-08-18 00:19:58

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