The heat transfer performance of fin-tube heat exchangers can be enhanced with the help of longitudinal vortex generators. In this work, we investigate the effect of employing a rectangular winglet having a punched hole on heat transfer and flow resistance characteristics in a fin-tube heat exchanger with the help of numerical simulations. Studies were performed on two configurations, namely, common flow down and common flow up at upstream and downstream locations. Performance characteristics such as Colburn’s factor (j), friction factor (f), and performance evaluation criterion were considered for evaluating the thermohydraulic performance. Investigations were performed considering Reynolds number in the range of 1500–9000, keeping the angle of attack as 45°. The shear stress transport k-ω turbulence model was used for performing numerical simulations. A significant augmentation of up to 71% in the thermohydraulic performance of fin-tube heat exchanger was observed with the common flow down configuration located upstream over the common flow up configuration located upstream, which displayed the least improvement.

中文翻译：

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使用涡流发生器提高翅片管换热器性能的计算机辅助工程分析

翅片管换热器的传热性能可以在纵向涡流发生器的帮助下得到提高。在这项工作中，我们借助数值模拟研究了在翅片管换热器中采用具有冲孔的矩形小翼对传热和流阻特性的影响。对两种配置进行了研究，即在上游和下游位置共同向下流动和共同向上流动。性能特征如科尔本系数 (j)、摩擦系数 (f) 和性能评估标准被考虑用于评估热工水力性能。考虑雷诺数在 1500-9000 范围内进行调查，保持攻角为 45°。剪应力传输 k-ω 湍流模型用于进行数值模拟。观察到翅片管换热器的热工水力性能显着提高了 71%，位于上游的共同向下流动配置比位于上游的共同向上流动配置显示出的改进最少。