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<p>To address the low heat transfer efficiency of traditional heat exchanger tubes, this study proposes a novel composite heat exchanger tube featuring biomimetic serpentine wavy inner ribs and elliptical dimples, inspired by the flow-guiding characteristics of a snake's surface and the fluid-guiding properties of natural oval cells. A numerical simulation method based on the Realizable k-ε turbulence model was employed to systematically investigate the effects of different arrangements, dimple quantities, and rib pitches on the heat transfer performance within a Reynolds number (Re) range of 8,000 to 18,000. The simulation results indicate that the composite structure effectively disrupts the fluid boundary layer and induces secondary flows, with variations in its geometric parameters significantly influencing the heat transfer efficiency. Under the condition of Re = 8,000, an optimal Performance Evaluation Criterion (PEC) of 1.21 was achieved, and the average Nusselt number (Nu) was significantly increased by 43.7% and 4.5% compared to the circular internal rib tube and the single serpentine wavy inner rib tube, respectively. Furthermore, direct comparisons among the designed geometries revealed that, at the same Reynolds number, the optimally configured composite tube significantly reduced the friction factor (<i>f</i>) by 12.1% and 3.5% relative to the circular internal rib tube and the serpentine wavy inner rib tube, respectively. This demonstrates lower pressure drop penalties and superior flow resistance characteristics, effectively achieving an optimal balance between heat transfer enhancement and energy conservation. Finally, field synergy analysis further revealed the underlying mechanism: the composite structure enhances convective heat transfer by fundamentally improving the synergy between the velocity and temperature fields. The findings of this study provide a crucial theoretical foundation for the design and optimization of novel, high-efficiency composite heat exchanger tubes.</p>

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Numerical Investigation and Structural Optimization of a Composite Heat Transfer Tube with Serpentine Wavy Ribs and Elliptical Dimples

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • Zhimiao Li,
  • Zhouyang Wang,
  • Lin Zheng,
  • Sizhe Zhang,
  • Qi Zhang

摘要

To address the low heat transfer efficiency of traditional heat exchanger tubes, this study proposes a novel composite heat exchanger tube featuring biomimetic serpentine wavy inner ribs and elliptical dimples, inspired by the flow-guiding characteristics of a snake's surface and the fluid-guiding properties of natural oval cells. A numerical simulation method based on the Realizable k-ε turbulence model was employed to systematically investigate the effects of different arrangements, dimple quantities, and rib pitches on the heat transfer performance within a Reynolds number (Re) range of 8,000 to 18,000. The simulation results indicate that the composite structure effectively disrupts the fluid boundary layer and induces secondary flows, with variations in its geometric parameters significantly influencing the heat transfer efficiency. Under the condition of Re = 8,000, an optimal Performance Evaluation Criterion (PEC) of 1.21 was achieved, and the average Nusselt number (Nu) was significantly increased by 43.7% and 4.5% compared to the circular internal rib tube and the single serpentine wavy inner rib tube, respectively. Furthermore, direct comparisons among the designed geometries revealed that, at the same Reynolds number, the optimally configured composite tube significantly reduced the friction factor (f) by 12.1% and 3.5% relative to the circular internal rib tube and the serpentine wavy inner rib tube, respectively. This demonstrates lower pressure drop penalties and superior flow resistance characteristics, effectively achieving an optimal balance between heat transfer enhancement and energy conservation. Finally, field synergy analysis further revealed the underlying mechanism: the composite structure enhances convective heat transfer by fundamentally improving the synergy between the velocity and temperature fields. The findings of this study provide a crucial theoretical foundation for the design and optimization of novel, high-efficiency composite heat exchanger tubes.