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<p>This numerical study investigates the enhancement of heat transfer in elastic tube bundle heat exchangers using fluid oscillator structures. Three configurations are compared: a conventional setup (Structure A), a Venturi oscillator (Structure B), and a dual-channel jet oscillator (Structure C). Simulations employ a fully coupled fluid-solid-thermal model with Large Eddy Simulation (LES) turbulence modeling via the finite volume method in Star-CCM+ (a commercial computational fluid dynamics (CFD) software). The methodology was validated through grid independence analysis and experimental data, showing a maximum error of 7.7%. Results demonstrate that self-excited oscillations significantly enhance flow disturbance and heat transfer. Within a shell-side air velocity range of 6–9&#xa0;m/s, Structure C exhibits the most substantial improvements in flow metrics, generating higher turbulence intensity and more complex vortex structures that disrupt the thermal boundary layer effectively. Compared to Structure A, Structure C enhances overall heat transfer capacity by over 70%, and by more than 30% compared to Structure B. Performance exhibits low sensitivity to tube-side flow rate variations, confirming the governing role of the shell-side oscillatory flow. While Structure B shows higher oscillation intensity, part of its energy is viscously dissipated. Structure C achieves a more favorable balance between heat transport and energy consumption. The study confirms the significant potential of dual-channel jet oscillators for developing high-performance heat exchangers.</p>

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Study on the heat exchange performance of two fluid self-excited oscillation devices adapted to elastic tube bundle heat exchangers

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月29日

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  • Lei Guo,
  • Jing Hu,
  • Shusheng Zhang

摘要

This numerical study investigates the enhancement of heat transfer in elastic tube bundle heat exchangers using fluid oscillator structures. Three configurations are compared: a conventional setup (Structure A), a Venturi oscillator (Structure B), and a dual-channel jet oscillator (Structure C). Simulations employ a fully coupled fluid-solid-thermal model with Large Eddy Simulation (LES) turbulence modeling via the finite volume method in Star-CCM+ (a commercial computational fluid dynamics (CFD) software). The methodology was validated through grid independence analysis and experimental data, showing a maximum error of 7.7%. Results demonstrate that self-excited oscillations significantly enhance flow disturbance and heat transfer. Within a shell-side air velocity range of 6–9 m/s, Structure C exhibits the most substantial improvements in flow metrics, generating higher turbulence intensity and more complex vortex structures that disrupt the thermal boundary layer effectively. Compared to Structure A, Structure C enhances overall heat transfer capacity by over 70%, and by more than 30% compared to Structure B. Performance exhibits low sensitivity to tube-side flow rate variations, confirming the governing role of the shell-side oscillatory flow. While Structure B shows higher oscillation intensity, part of its energy is viscously dissipated. Structure C achieves a more favorable balance between heat transport and energy consumption. The study confirms the significant potential of dual-channel jet oscillators for developing high-performance heat exchangers.