Scholarlink

<p>This paper systematically investigates the heat transfer and flow performance of perforated fin heat transfer surfaces, focusing on the effects of perforation geometry (aspect ratio <i>α</i> and inclination angle <i>β</i>) and arrangement on thermo-hydraulic performance. Results indicate that within a Reynolds number (Re) range of 200–1200, the perforated structure effectively disrupts thermal and hydrodynamic boundary layers, enhances fluid mixing, and significantly improves heat transfer. Reducing the aspect ratio <i>α</i> of elliptical perforations from 3:1 to 3:3 (circular perforations) increased the Colburn <i>j</i> factor by up to 8.3% compared to non-perforated fins, albeit with a corresponding 5.87% increase in the friction factor <i>f</i>. Employing a non-uniform arrangement with progressively increasing spacing (larger-spaced perforation) yielded a 2.46% improvement in the performance evaluation criterion (PEC) compared to a uniform arrangement, attributed to the synergistic effect of enhanced heat transfer from the densely perforated front section and reduced flow dissipation from the sparsely perforated rear section. Analysis of the perforation inclination angle (<i>β</i>) reveals that the <i>β</i> = 0° design, with the major axis aligned with the mainstream flow, exhibits optimal overall performance, achieving a 2.6% PEC improvement over non-perforated fins. Optimizing elliptical perforation geometry (recommended <i>α</i> = 3:3, <i>β</i> = 0°) and utilizing a graded spacing arrangement achieves the best balance between enhanced heat transfer and pressure drop control, providing a theoretical basis for the design of high-efficiency compact heat exchangers.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Analysis of heat transfer and flow performance in elliptical perforated fin heat exchangers

  • 期刊论文

  • 发表日期：

    2025年8月19日

查看全文
  • Chao Zhang,
  • Chuanting Luo

摘要

This paper systematically investigates the heat transfer and flow performance of perforated fin heat transfer surfaces, focusing on the effects of perforation geometry (aspect ratio α and inclination angle β) and arrangement on thermo-hydraulic performance. Results indicate that within a Reynolds number (Re) range of 200–1200, the perforated structure effectively disrupts thermal and hydrodynamic boundary layers, enhances fluid mixing, and significantly improves heat transfer. Reducing the aspect ratio α of elliptical perforations from 3:1 to 3:3 (circular perforations) increased the Colburn j factor by up to 8.3% compared to non-perforated fins, albeit with a corresponding 5.87% increase in the friction factor f. Employing a non-uniform arrangement with progressively increasing spacing (larger-spaced perforation) yielded a 2.46% improvement in the performance evaluation criterion (PEC) compared to a uniform arrangement, attributed to the synergistic effect of enhanced heat transfer from the densely perforated front section and reduced flow dissipation from the sparsely perforated rear section. Analysis of the perforation inclination angle (β) reveals that the β = 0° design, with the major axis aligned with the mainstream flow, exhibits optimal overall performance, achieving a 2.6% PEC improvement over non-perforated fins. Optimizing elliptical perforation geometry (recommended α = 3:3, β = 0°) and utilizing a graded spacing arrangement achieves the best balance between enhanced heat transfer and pressure drop control, providing a theoretical basis for the design of high-efficiency compact heat exchangers.