ABSTRACT

The current paper is focused on the experimental investigation of the turbulent forced convection with circular-hole spring tape (CHST) inserts in a circular tube. The CHST inserts with different hole and spring ratios, are investigated for a wide ranges of Reynolds number (10,000–50,000). Results show that use of CHST provides an increase in heat transfer by 35% and 51% when assessed with other inserts and plain tube, respectively. Furthermore, an entropy generation study shows that the irreversibility rises significantly with the increase of diameter ratio and Reynolds number. The overall enhancement ratio has been evaluated to study the effect of the CHST. The thermo-hydraulic performance are approximately more than unity for all the cases which indicates that the consequence of HT augmentation due to the augmenting apparatus is more governing than the consequence of the growing friction penalty. Thermo-hydraulic performance of c = 0, y = 1.5 (maximum value) is 25% higher than c = 0.6, y = 3.0 (minimum value). A predictive Nusselt number and friction factor correlations are also developed.

摘要

当前论文的重点是在圆管中插入圆孔弹簧带 (CHST) 的湍流强制对流的实验研究。研究了具有不同孔和弹簧比的 CHST 刀片的雷诺数范围很广（10,000–50,000）。结果表明，当与其他插件和普通管一起评估时，使用 CHST 分别使传热增加了 35% 和 51%。此外，熵生成研究表明，不可逆性随着直径比和雷诺数的增加而显着增加。已评估整体增强率以研究 CHST 的效果。在所有情况下，热工水力性能大约大于 1，这表明由于增加装置引起的 HT 增加的结果比增加摩擦损失的结果更重要。热工水力性能c = 0，y = 1.5（最大值）比c = 0.6，y = 3.0（最小值）高 25% 。还开发了预测性 Nusselt 数和摩擦系数相关性。