Abstract The flow and heat transfer characteristics of different surface texture pin fins were experimentally investigated. The pin fin outer surface texture has been modified to different threaded surface texture (i.e., Metric, Worm, ACME, Buttress, Sharp V, Whitworth and square thread) without changing cross-sectional areas. The Reynolds number based on hydraulic diameter was varied from 2500 to 4500. This study reveals that threaded surface pin heat sink is 18.13% higher heat transfer than plain pin heat sink. In terms of specific performance consideration, threaded surface textures pin fins shows impending substitute design to plain circular pin fins. The threaded surface texture pin has decreased aerodynamic consequence compared to plain circular pin. The pressure drop across heat sink is 21.4% lesser in plain pin heat sink than screw surface pin heat sink. The thermal resistance difference between experimental and CFD analysis is 4.08%. The threaded texture increases surface area, flow turbidity and delays flow separation and these factors enhances the heat transfer.

中文翻译：

---

不同表面织构针翅式散热器的传热研究

摘要 通过实验研究了不同表面纹理针状翅片的流动和传热特性。针翅外表面纹理已修改为不同的螺纹表面纹理（即公制、蜗杆、ACME、Buttress、Sharp V、Whitworth 和方螺纹），而没有改变横截面积。基于水力直径的雷诺数从 2500 到 4500 不等。这项研究表明，螺纹表面销式散热器的热传递比普通销式散热器高 18.13%。在特定的性能考虑方面，螺纹表面纹理针鳍显示即将替代平面圆形针鳍的设计。与普通圆形销相比，螺纹表面纹理销降低了空气动力学后果。散热器两端的压降为 21。普通销式散热器比螺钉表面销式散热器少 4%。实验和 CFD 分析之间的热阻差异为 4.08%。螺纹纹理增加了表面积、流动浊度并延迟了流动分离，这些因素增强了传热。