ABSTRACT Circular ring inserts are found to enhance the heat transfer rates in the tube flow, while perforations in the ring inserts mitigate the frictional losses. In this study, the geometry of perforated ring is modified by creating lanced holes with a deflector. The experimental data for lanced ring are collected by varying the pitch ratio from 3.33–6.66 and diameter ratio from 0.5–0.6 in the Reynolds number range of 10000–37754. The enhancements in the Nusselt number and friction factor are found to vary in the range of 1.69–4.1 and 16–72, respectively.

中文翻译：

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带刺环嵌件的圆管内传热和流体流动的实验研究

摘要 圆形环嵌件被发现可以提高管流中的传热率，而环嵌件中的穿孔可以减轻摩擦损失。在这项研究中，穿孔环的几何形状通过使用偏转器创建刺孔来修改。通过在 10000-37754 的雷诺数范围内将节距比从 3.33-6.66 和直径比从 0.5-0.6 变化来收集针刺环的实验数据。发现 Nusselt 数和摩擦系数的增强分别在 1.69-4.1 和 16-72 的范围内变化。