This study reports the cross-sectional curvature effect resulted from a twisted tape fabrication or installation into an annular pipe on the enhancement of heat transfer to pay attention to the use of twisted tapes more efficiently. Six different twisted tapes having two twist ratios (3 and 4) and three curve ratios (1.761, 2.252 and 3.271) in the Reynolds number range from 5840 to 30,900 were numerically analyzed. The analysis method was validated with three different experimental results from loose-fit to tight-fit of a twisted tape. According to polyhedral mesh element analysis of curved cross-sectional twisted tapes, capable of having better compatibility with experimental results, Nusselt numbers increased with increasing curve ratio and decreasing Reynolds number and twist ratio. While the curved twisted tape is more efficient than the smooth tube, losses on heat transfer efficiency are observed compared to the classical twisted tape. Although the losses caused by the curvature on the twisted tape appear to be insignificant at high curve ratios, the effect of low curve ratios increases significantly. For the lowest CR and the highest TR under analysis conditions, it was observed that TT lost 28 % of its normal productivity increase due to this effect.

这项研究报告了由于扭曲带的制造或安装到环形管中而引起的横截面曲率效应，从而增强了热传递，从而更加有效地使用扭曲带。数值分析了雷诺数范围为5840至30900的六种不同的扭曲带，它们具有两个扭曲比（3和4）和三个曲线比（1.761、2.252和3.271）。该分析方法通过从扭曲胶带的松配合到紧配合的三个不同的实验结果进行了验证。根据能够更好地与实验结果兼容的弯曲横截面扭曲带的多面体网格元素分析，Nusselt数随弯曲比的增加而增加，而雷诺数和扭曲比的减少则增加。尽管弯曲的扭曲带比光滑管更有效，但与传统的扭曲带相比，传热效率却有所降低。尽管在高曲率比率下由扭曲带上的曲率引起的损耗似乎微不足道，但低曲率比率的影响却显着增加。对于分析条件下最低的CR和最高的TR，观察到TT由于这种作用损失了其正常生产率提高的28％。