Experimental heat transfer enhancement investigation is carried out by using various twisted tape inserted tube configurations under turbulent flow conditions. Constant heat flux is applied on the outer wall of the test tube. The working fluid is selected as water. The twisted tapes having twist ratio (y/w) of 5.88 are modified with perforations (PTTE) and dimples (DTTE) at the edge of the twisted tape. The ratio of the distances between the perforations/dimples (p) to the twist length (y), i.e. pitch ratio (p/y), are selected as 0.25, 0.50 and 1.00. The results show that using twisted tapes lead to increase thermal performance when compared to the smooth tube. The DTTEs promise more heat transfer performance rather than the PTTEs, while the PTTEs gives less friction loss penalty than the DTTEs. Overall results are given as performance evaluation criteria and the highest PEC value is obtained as 1.57 for DTTE_p/y = 0.25 type twisted tape insert used case at Reynolds number of 6367. In addition, the paper includes a comparative evaluation in terms of the heat transfer and the hydraulic performance about the perforations/dimples at the edge or centre of the twisted tape.

通过在湍流条件下使用各种扭曲的带状插入管配置进行实验性传热增强研究。恒定的热通量施加在试管的外壁上。选择工作流体作为水。具有5.88的扭曲比（y / w）的扭曲带在扭曲带的边缘处被穿孔（PTTE）和凹痕（DTTE）修饰。孔眼/凹坑之间的距离（p）与扭曲长度（y）的比值，即节距比（p / y）），分别选择0.25、0.50和1.00。结果表明，与光滑管相比，使用扭曲带可提高热性能。DTTE比PTTE具有更高的传热性能，而PTTE的摩擦损失却比DTTE少。给出总体结果作为性能评估标准，对于DTTE_p / y = 0.25型加捻胶带插入件，在雷诺数为6367的情况下，最高PEC值为1.57。此外，本文还对传热进行了比较评估。以及缠绕带边缘或中心处的穿孔/凹坑的水力性能。