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<p>This study numerically investigates the effects of various structural parameters on the heat transfer and flow performance of flat tube heat exchangers. The mechanisms of key parameters, including tube arrangement, waist height (<i>H</i>), transverse spacing (<i>L</i><sub><i>t</i></sub>), longitudinal spacing (<i>L</i><sub><i>d</i></sub>), and tube width (<i>W</i>), are explored. Results indicate that interlace arrangements significantly enhance heat transfer through the formation of periodic vortices, albeit with a notable increase in pressure drop. The waisted structure alters near-wall flow patterns, influencing boundary layer development and reducing pressure drop within a specific parameter range. Analysis of transverse spacing reveals a 12% increase in performance evaluation criterion (<i>JF</i> factor) at <i>L</i><sub><i>t</i></sub>=16&#xa0;mm compared to <i>L</i><sub><i>t</i></sub>=10&#xa0;mm, demonstrating that increasing the spacing improves overall performance. Optimization of longitudinal spacing shows an 11.6% improvement in <i>JF</i> factor at <i>L</i><sub><i>d</i></sub>=15&#xa0;mm compared to <i>L</i><sub><i>d</i></sub>=21&#xa0;mm. Studies on tube width indicate that the <i>W</i> = 10&#xa0;mm configuration exhibits a 10.1% increase in heat transfer coefficient and a 25.9% increase in <i>JF</i> factor at a velocity of 12&#xa0;m/s compared to <i>W</i> = 18&#xa0;mm. This research provides a theoretical basis for the optimized design of compact heat exchangers, enhancing energy efficiency while maintaining superior heat transfer capabilities.</p>

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Study on the heat transfer and flow performance of flat tube heat exchangers with different structured waistbands

  • 期刊论文

  • 发表日期：

    2026年1月24日

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  • Peng Cang,
  • Chao Zhang,
  • Chuanting Luo

摘要

This study numerically investigates the effects of various structural parameters on the heat transfer and flow performance of flat tube heat exchangers. The mechanisms of key parameters, including tube arrangement, waist height (H), transverse spacing (Lt), longitudinal spacing (Ld), and tube width (W), are explored. Results indicate that interlace arrangements significantly enhance heat transfer through the formation of periodic vortices, albeit with a notable increase in pressure drop. The waisted structure alters near-wall flow patterns, influencing boundary layer development and reducing pressure drop within a specific parameter range. Analysis of transverse spacing reveals a 12% increase in performance evaluation criterion (JF factor) at Lt=16 mm compared to Lt=10 mm, demonstrating that increasing the spacing improves overall performance. Optimization of longitudinal spacing shows an 11.6% improvement in JF factor at Ld=15 mm compared to Ld=21 mm. Studies on tube width indicate that the W = 10 mm configuration exhibits a 10.1% increase in heat transfer coefficient and a 25.9% increase in JF factor at a velocity of 12 m/s compared to W = 18 mm. This research provides a theoretical basis for the optimized design of compact heat exchangers, enhancing energy efficiency while maintaining superior heat transfer capabilities.