Abstract A pair of 12.7 mm wide (W) and 25.4 mm tall rectangular flexible strips made of 0.1 mm thick aluminum sheet was employed to enhance convective heat transfer from a flat surface in a closed-loop wind tunnel. The strip pair was placed side-by-side with a spacing of 1W, 2W and 3W. The incoming wind velocity was fixed at 10 m/s, resulting in a Reynolds number based on the strip width (ReW) of 8.5 × 103. The heat transfer enhancement was represented in terms of the Nusselt number with respect to the reference Nusselt number in the absence of the strip pair (Nu/Nuo). A triple-sensor hotwire probe was employed to characterize the flow characteristics when the plate was unheated. Particularly strong vortex-vortex interactions, a large downwash velocity and intense flow fluctuations were obtained behind the 1W-spaced strip pair. These contributed to better mixing and transport of the thermal energy. The 1W-spaced strip pair generated the highest Nu/Nu0 values. Nu/Nu0 of approximately 1.50 was achieved at the middle of the strip pair at X=9W. At this location, the pairs separated by 2W and 3W resulted in Nu/Nu0 value of around 1.26 and 1.17, respectively. The 1W-spaced strip pair also produced the largest span-averaged Nu/Nu0.

中文翻译：

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通过柔性条带对加热平坦表面的传热增强

摘要 一对由 0.1 mm 厚铝板制成的 12.7 mm 宽 (W) 和 25.4 mm 高矩形柔性带用于增强闭环风洞中平面的对流传热。条对并排放置，间距为 1W、2W 和 3W。进来的风速固定为 10 m/s，导致基于带材宽度 (ReW) 的雷诺数为 8.5 × 103。没有条带对（Nu/Nuo）。当板未加热时，采用三传感器热线探针来表征流动特性。在 1W 间隔的条带对后面获得了特别强的涡旋-涡旋相互作用、大的下洗速度和强烈的流动波动。这些有助于更好地混合和传输热能。1W 间隔条对产生最高的 Nu/Nu0 值。在 X=9W 处，在条带对的中间实现了大约 1.50 的 Nu/Nu0。在这个位置，相隔 2W 和 3W 的对导致 Nu/Nu0 值分别约为 1.26 和 1.17。1W 间隔的条带对也产生了最大的跨度平均 Nu/Nu0。