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Heat Transfer Performance and Flow Characteristics of a Heat Exchange Tube with Isosceles Trapezoidal Winglet Longitudinal Vortex Generators

Author

Listed:
  • Lin Liu

    (Jiangsu Key Laboratory of Green Process Equipment, School of Mechanical Engineering and Rail Transit, Changzhou University, No. 21 Ge Hu Middle Road, Changzhou 213164, China)

  • Zhichun Ni

    (Jiangsu Key Laboratory of Green Process Equipment, School of Mechanical Engineering and Rail Transit, Changzhou University, No. 21 Ge Hu Middle Road, Changzhou 213164, China)

  • Haoyuan Tang

    (Jiangsu Key Laboratory of Green Process Equipment, School of Mechanical Engineering and Rail Transit, Changzhou University, No. 21 Ge Hu Middle Road, Changzhou 213164, China)

  • Hui Xu

    (Jiangsu Key Laboratory of Green Process Equipment, School of Mechanical Engineering and Rail Transit, Changzhou University, No. 21 Ge Hu Middle Road, Changzhou 213164, China)

  • Bingyun Jiang

    (Wanbang Digital Energy Co., Ltd., No. 39 Long Hui Road, Changzhou 213000, China)

Abstract

The thermal-hydraulic performance of circular heat transfer tubes equipped with isosceles trapezoidal winglet longitudinal vortex generators (ITWL-VGs) was investigated through integrated experimental and numerical approaches. Experimental studies were conducted that focused on the effects of key parameters: (1) the ITW quantity ( n = 4, 6, 8); (2) the attack angle (α = 0°, 15°, 30°, 45°); and (3) four distinct VG arrangements. Numerical simulations employing multi-physical field analysis elucidated the underlying heat transfer enhancement mechanisms. The numerical simulations demonstrated excellent agreement with the experimental measurements. The results indicated that uniformly distributed ITWL-VGs with suitable angles of attack (α) significantly enhanced the thermal performance. Increasing the number of ITWs ( N ) generated additional longitudinal vortices, intensifying fluid mixing and heat transfer enhancement, thereby improving the PEC value. All the Nusselt number ( Nu ), friction factor ( f ) and PEC values exhibited positive correlations with the α and the spacing ( L P ), respectively. Within the scope of this study, the α should not be less than 30°. In addition, an optimal value should be used for the L P . The maximum PEC value was 1.27. These findings conclusively demonstrated the significant heat transfer enhancement capabilities of ITWL-VGs.

Suggested Citation

  • Lin Liu & Zhichun Ni & Haoyuan Tang & Hui Xu & Bingyun Jiang, 2025. "Heat Transfer Performance and Flow Characteristics of a Heat Exchange Tube with Isosceles Trapezoidal Winglet Longitudinal Vortex Generators," Energies, MDPI, vol. 18(7), pages 1-22, March.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:7:p:1717-:d:1623665
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