Abstract A 0.1 mm thick and 12.7 mm wide (W) rectangular flexible strip is experimentally investigated for its effectiveness in boosting the convective cooling from a heated flat plate in a wind tunnel. Three strip height, 25.4 mm, 38.1 mm and 50.8 mm, were explored at a 10 m/s wind, and a Reynolds number of 8500, based on the strip width. The heat transfer results are expressed in terms of Nusselt number normalized by the corresponding unperturbed reference case (Nu/Nuo). To uncover the physics behind the heat transfer enhancement, the turbulent flow characteristics were detailed via a 3D hotwire probe. The 25.4 mm-high strip generated vortex structures closest to the surface, and the largest near-surface-downwash velocity. These attributes result in a better mixing, and thus, heat removal. Therefore, the 25.4 mm-high strip provides the highest Nu/Nuo, with a peak value of approximately 1.76 at 9 W downstream, 0.26 larger than that of the 50.8 mm-high strip.

中文翻译：

---

平板热对流上柔性矩形条带高度的研究

摘要 0.1 毫米厚和 12.7 毫米宽 (W) 的矩形柔性带在提高风洞中加热平板对流冷却的有效性方面进行了实验研究。在 10 m/s 风速和 8500 雷诺数（基于带钢宽度）下探索了三种带钢高度，25.4 mm、38.1 mm 和 50.8 mm。传热结果以由相应的未扰动参考情况 (Nu/Nuo) 归一化的 Nusselt 数表示。为了揭示传热增强背后的物理原理，通过 3D 热线探针详细描述了湍流特性。25.4 毫米高的条带产生最靠近地表的涡旋结构，以及最大的近地表下洗速度。这些属性导致更好的混合，从而散热。因此，25。