ABSTRACT

Effects of the curved winglet vortex generator inserts (CWVGs) on the forced convection heat transfer, friction factor, and performance evaluation criteria (PEC) interior flow were experimentally examined in this work. The CWVGs manufactured in CNC from aluminum 6061 material were used as the expanded finned surface with different attack angles (α) of 0°, 30°, and 60°. In the study, air was used as the fluid. The experiments were realized in the Reynolds number ranging from 6000 to 20000. The results showed that the CWVG insert in a rectangular channel ensured significantly higher Nusselt number than that of the channel without the insert through friction factor that was also increased. The Nusselt number and friction factor increased with the increase in the attack angle (α) of CWVG insert. The heat transfer enhancement by the CWVGs with attack angle of 0°, 30°, and 60° ensured higher than that of the plain tube in the range of 217.39–291.30%, 260.86–465.21%, and 278.26–476.08%, respectively. The friction factors in the inner rectangular channel produced by the CWVGs with attack angle of 0°, 30° and 60°, were about 8.93–10.33, 10.66–14.16, and 14.96–19.13 times above the plain tube, respectively. The performance evaluation criteria (PEC) for CWVGs with attack angle of 0°, 30°, and 60° were in the range of 1.22–1.78, 1.28–1.86, and 1.32–1.89, respectively.

摘要

在这项工作中，通过实验研究了弯曲小翼涡流发生器插件 (CWVG) 对强制对流热传递、摩擦系数和性能评估标准 (PEC) 内部流动的影响。由铝 6061 材料在 CNC 中制造的 CWVG 用作扩展翅片表面，具有 0°、30° 和 60° 的不同攻角 (α)。在这项研究中，空气被用作流体。实验在雷诺数从 6000 到 20000 范围内实现。结果表明，矩形通道中的 CWVG 插入确保了比没有插入的通道显着更高的努塞尔数，通过摩擦系数也增加了。努塞尔数和摩擦系数随着 CWVG 刀片攻角 (α) 的增加而增加。攻角为0°、30°和60°的CWVGs的传热增强率分别在217.39-291.30%、260.86-465.21%和278.26-476.08%范围内确保高于光管。攻角为0°、30°和60°的CWVG产生的内矩形通道的摩擦因数分别为光管的8.93~10.33、10.66~14.16和14.96~19.13倍。攻角为0°、30°和60°的CWVG的性能评估标准（PEC）分别在1.22-1.78、1.28-1.86和1.32-1.89的范围内。分别为光管上方的 33、10.66–14.16 和 14.96–19.13 倍。攻角为0°、30°和60°的CWVG的性能评估标准（PEC）分别在1.22-1.78、1.28-1.86和1.32-1.89的范围内。分别为光管上方的 33、10.66–14.16 和 14.96–19.13 倍。攻角为0°、30°和60°的CWVG的性能评估标准（PEC）分别在1.22-1.78、1.28-1.86和1.32-1.89的范围内。