Relationship between the Intensity of Secondary Flow and Convection Heat Transfer in a Helically Coiled Circular Tube with Uniform Wall Temperature

  • ZHANG Jinlong ,
  • ZHAO Chuangyao ,
  • WANG Liangbi
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  • 1. School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China
    2. Key Laboratory of Railway Vehicle Thermal Engineering of MOE, Lanzhou Jiaotong University, Lanzhou 730070, China
    3. School of Building Services Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

网络出版日期: 2023-11-22

基金资助

This work is supported by the National Natural Science Foundation of China (No. 51776093, No. 52066009), Transformation of S&T achievements in Universities of Gansu Province of China (No. 2019C-06), Major Special Projects of Gansu Province of China (21ZD4GA027), Young Scientists Fund of Lanzhou Jiaotong University (2020038).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Relationship between the Intensity of Secondary Flow and Convection Heat Transfer in a Helically Coiled Circular Tube with Uniform Wall Temperature

  • ZHANG Jinlong ,
  • ZHAO Chuangyao ,
  • WANG Liangbi
Expand
  • 1. School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China
    2. Key Laboratory of Railway Vehicle Thermal Engineering of MOE, Lanzhou Jiaotong University, Lanzhou 730070, China
    3. School of Building Services Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

Online published: 2023-11-22

Supported by

This work is supported by the National Natural Science Foundation of China (No. 51776093, No. 52066009), Transformation of S&T achievements in Universities of Gansu Province of China (No. 2019C-06), Major Special Projects of Gansu Province of China (21ZD4GA027), Young Scientists Fund of Lanzhou Jiaotong University (2020038).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

摘要

采用数值方法研究了螺旋圆管中充分发展的层流流动。基于沿主流的绝对涡通量无量纲参数(二次流雷诺数Se)用于表示螺旋圆管中离心力引起的二次流强度。研究了层流下二次流强度与对流换热之间的关系。考虑了曲率和挠率对强化传热的影响。结果表明,沿主流的绝对涡通量可以用来指示二次流的局部和平均强度;沿主流的绝对涡通量的无量纲参数二次流雷诺数决定了对流传热和摩擦系数。得到了努塞尔数和摩擦系数与二次流雷诺数的关系。螺旋管曲率对努塞尔数的影响较为明显,但螺旋管挠率对努塞尔数的作用不明显。

本文引用格式

ZHANG Jinlong , ZHAO Chuangyao , WANG Liangbi . Relationship between the Intensity of Secondary Flow and Convection Heat Transfer in a Helically Coiled Circular Tube with Uniform Wall Temperature[J]. 热科学学报, 2023 , 32(3) : 1007 -1022 . DOI: 10.1007/s11630-023-1794-y

Abstract

Numerical method is used to investigate fully developed laminar flow in helically coiled circular tube in this paper. The non-dimensional parameter (secondary flow Reynolds number Se) based on absolute vorticity flux along the mainstream is used to indicate the intensity of secondary flow caused by the centrifugal effect in helically coiled circular tube. The relationship between the intensity of secondary flow and the intensity of laminar convective heat transfer is studied. The effects of curvature and torsion on the enhancement of heat transfer are also considered. The results reveal that the absolute vorticity flux along the mainstream can be used to indicate the local or averaged intensity of secondary flow; the non-dimensional parameter of the absolute vortex along the main flow determines the convective heat transfer and friction factor. The relationships of Nusselt number and friction factor with the Se are obtained. The effect of curvature on Nusselt number is obvious, but the effect of torsion on Nusselt number is less obvious.

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