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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical study on thermo-hydraulic characteristics of turbulent flow in a circular tube fitted with helical blade rotors
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Numerical study on thermo-hydraulic characteristics of turbulent flow in a circular tube fitted with helical blade rotors

机译：装有螺旋叶片转子的圆管内湍流热工水力特性的数值研究

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摘要

Numerical simulations were carried out to investigate the heat transfer and friction loss characteristics of a circular tube equipped with helical blade rotors and to optimize the configuration of the rotor. The numerical data had good agreement with the experimental data. The simulation results revealed that for rotors with different cross section shapes, the rotor with ellipse section shape generated higher Nus-selt number, friction factor and thermal performance factor than the rotor with other section shapes; for rotors with different axis diameters, the Nusselt number, friction factor and thermal performance factor increased with the increasing rotor axis diameter; for rotors with different blade numbers, the Nusselt number and thermal performance factor increased with the increasing blade number; and the rotor with four blade numbers offered the highest friction factor followed by the rotor with two blade numbers and then the rotor with three blade numbers. Meanwhile, outlet radial velocity and tangential velocity contours of the plain tube and the tube fitted with helical blade rotors were also presented in the paper, which indicated that the average radial velocity and tangential velocity of the tube with helical blade rotors were significantly larger than those of plain tube under the same Reynolds number; the rotor with ellipse section shape generated higher radial velocity and tangential velocity followed by the rotor with trapezoid section shape and then the rotor with concave section shape; both radial velocity and tangential velocity increased with the increasing axis diameter and blade number.
机译：进行了数值模拟，以研究装有螺旋叶片转子的圆管的传热和摩擦损失特性，并优化转子的结构。数值数据与实验数据吻合良好。仿真结果表明，对于不同截面形状的转子，椭圆截面形状的转子产生的Nus-selt数，摩擦系数和热性能系数要高于其他截面形状的转子。对于不同轴径的转子，随着转子轴径的增加，其努塞尔数，摩擦系数和热性能系数均增大。对于具有不同叶片数的转子，随着叶片数的增加，Nusselt数和热性能系数也随之增加。带有四个叶片编号的转子提供最高的摩擦系数，其次是具有两个叶片编号的转子，然后是具有三个叶片编号的转子。同时，本文还给出了普通管和装有螺旋叶片转子的管的出口径向速度和切线速度轮廓，这表明螺旋叶片转子管的平均径向速度和切线速度明显大于那些。在相同雷诺数下的普通管的数量；椭圆形截面的转子产生较高的径向速度和切线速度，其次是梯形截面的转子，然后是凹形的转子。径向速度和切向速度都随轴直径和刀片数量的增加而增加。

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  • 作者

    Zhen Zhang; Weimin Yang; Changfeng Guan; Yumei Ding; Hua Yan;

  • 作者单位

    College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;

    College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China ,State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;

    College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;

    College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;

    College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;

  • 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 enhancement; helical blade rotor; velocity contour; blade number; axis diameter;

    机译：传热增强;螺旋叶片转子速度轮廓刀片编号;轴径;

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