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首页> 外文期刊>Journal of Heat Transfer >Impact of Delta-Winglet Pair of Vortex Generators on the Thermal and Hydraulic Performance of a Triangular Channel Using Al_2O_3-Water Nanofluid
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Impact of Delta-Winglet Pair of Vortex Generators on the Thermal and Hydraulic Performance of a Triangular Channel Using Al_2O_3-Water Nanofluid

机译：Al_2O_3-水纳米流体对三角涡流发生器小涡对三角通道热工和水力性能的影响

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摘要

This paper presents the laminar forced convection of Al_2O_3-water nanofluid in a triangular channel, subjected to a constant and uniform heat flux at the slant walls, using delta-winglet pair (DWP) of vortex generator which is numerically investigated in three dimensions. The governing equations of mass, momentum, and energy are solved using the finite volume method (FVM). The nanofluid properties are estimated as constant and temperature-dependent properties. The nanoparticle concentrations and diameters are in ranges of 1-4% and 25-85 nm, respectively. Different attack angles of vortex generators are examined which are 7deg, 15 deg, 30 deg, and 45 deg with range of Reynolds number from 100 to 2000. The results show that the heat transfer coefficient is remarkable dependent on the attack angle of vortex generators and the volume fraction of nanopar-ticles. The heat transfer coefficient increases as the attack angle increases from 7 deg to 30 deg and then diminishes at 45 deg. The heat transfer rate remarkably depends on the nanoparticle concentration and diameter, attack angle of vortex generator and Reynolds number. An increase in the shear stress is found when attack angle, volume fraction, and Reynolds number increase.
机译：本文利用涡旋发生器的三角翼-小翼对（DWP）提出了三角形通道中的Al_2O_3-水纳米流体的层流强迫对流，在斜壁上受到恒定且均匀的热通量，在三维空间上进行了数值研究。质量，动量和能量的控制方程使用有限体积法（FVM）求解。估计纳米流体的性质为恒定的和与温度有关的性质。纳米颗粒的浓度和直径分别在1-4％和25-85nm的范围内。研究了涡旋发生器的不同迎角，分别为雷诺数范围为100至2000的7deg，15 deg，30 deg和45 deg。结果表明，传热系数显着取决于涡发生器的迎角。纳米粒子的体积分数。传热系数随着攻角从7度增加到30度而增加，然后在45度时减小。传热速率明显取决于纳米粒子的浓度和直径，涡旋发生器的迎角和雷诺数。当攻角，体积分数和雷诺数增加时，剪切应力会增加。

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  • 来源
    《Journal of Heat Transfer》 |2014年第2期|021901.1-021901.9|共9页
  • 作者

    Hamdi E. Ahmed; M. Z. Yusoff;

  • 作者单位

    Department of Mechanical Engineering, College of Engineering, University of Anbar, Anbar 31001, Iraq Centre for Advanced Computational Engineering, College of Engineering, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, Kajang 43000, Selangor, Malaysia;

    Centre for Advanced Computational Engineering, College of Engineering, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, Kajang 43000, Selangor, Malaysia;

  • 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

    heat transfer; laminar flow; triangular channel; vortex generator; nanofluid;

    机译：传播热量;层流三角通道涡流发生器纳米流体;

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