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Experimental study of heat transfer and flow of delta winglets inline arrays in a tube heat exchanger for enhanced heat transfer

机译：管式换热器中达到划线阵列传热和流动的试验研究，用于增强热传递

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摘要

This experiment was carried out using delta winglet arrays of vortex generators (VG) with inline arrangement in a tube heat exchanger to study enhanced heat transfer and flow behaviour. The experiment was conducted for the turbulent flow (Re - 6000 to 27000). In this experiment, different parameters, pitch ratios (PR = 1.6, 2.4, and 4.8), lengths (1 = 10, 15, and 20 mm), and attack angles (B = 0°, 10°, 20°, 30°, and 45°) were studied and then their effect on thermal performance was observed. Results indicate that the PR affected f and Nu significantly. For PR = 1.6, VGs showed the highest f and Nu for all of the cases. Vortex generators with L10 B45 PR4.S achieved the best TPE with 1.23 at Re = 6000. Attack angle B indicated a significant impact on thermal performance and 45 degree showed the TPE of 1.23 at lower Re. Oil film flow and smoke flow visualization were employed to identify the flow vortices and understand flow mechanism. The oil film flow and smoke flow visualization clearly traced longitudinal vortex, and induced vortex, which induced impingement flow and re-circulation zone that lead to significant heat transfer enhancement.
机译：使用Delta Winelet阵列的涡流发生器（VG）进行该实验，在管式热交换器中具有内联布置，以研究增强的传热和流动行为。对湍流进行实验（RE-6000至27000）进行。在该实验中，不同的参数，俯仰比（Pr = 1.6,2.4和4.8），长度（1 = 10,15和20mm），攻击角（B = 0°，10°，20°，30°研究了45°），然后观察到它们对热性能的影响。结果表明，PR显着影响了F和NU。对于PR = 1.6，VGS显示所有情况的最高F和NU。具有L10 B45 PR4的涡流生成器在RE = 6000处实现了最佳TPE。攻击角B表示对热性能的显着影响，45度在较低的RE处显示1.23的TPE。采用油膜流动和烟雾性能可视化来识别流动涡流并理解流动机制。油膜流动和烟雾流动可视化清楚地追踪纵向涡旋和诱导的涡旋，其诱导撞击流动和再循环区域，导致显着的传热增强。

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  • 来源
    《Heat transfer》 |2021年第4期|3582-3602|共21页
  • 作者

    Islam; A. Nurizki; I. Barsoum; Nader Ayish; R. Simmons;

  • 作者单位

    Department of Mechanical Engineering Khalifa University of Science and Technology P.O. Box 2533 Abu Dhabi UAE;

    Department of Mechanical Engineering Khalifa University of Science and Technology P.O. Box 2533 Abu Dhabi UAE;

    Department of Mechanical Engineering Khalifa University of Science and Technology P.O. Box 2533 Abu Dhabi UAE;

    Department of English College of Arts and Science Khalifa University of Science and Technology Abu Dhabi UAE;

    Department of Industrial and Systems Engineering Khalifa University of Science and Technology Abu Dhabi UAE;

  • 收录信息 美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    delta winglet; flow visualization; inline arrays; longitudinal vortex; thermal performance; vortex generators;

    机译：Delta Winglet;流动可视化;内联阵列;纵向涡旋;热性能;涡流发电机;

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