For the first time in this study, three different heat transfer enhancement methods including bubble injection into the working fluid, wavy strip turbulator (WST) utilization in the inner tube, and the Nanofluid application as the working fluid, were used separately and simultaneously in a double tube heat exchanger (DTHEX). Different air flow rates were injected into the hot fluid. Various turbulators’ angles were examined, including 60, 90, 115, and 150°, with water and water-CuO nanofluid as working fluids. The results showed that bubble injection, application of Nanofluid, and the utilization of turbulator increased the heat transfer up to 66%, 74%, and 17%, respectively. Furthermore, the simultaneous use of these three methods increased heat transfer from 33% to 144%. Finally, the most optimal case was chosen utilizing the TEF factor.

本研究首次将气泡注入工作流体、利用内管中的波浪带状湍流器 (WST) 以及作为工作流体的纳米流体应用三种不同的传热增强方法分别并同时使用双管换热器（DTHEX）。不同的空气流速被注入热流体。使用水和水-CuO 纳米流体作为工作流体，检查了各种湍流器的角度，包括 60、90、115 和 150°。结果表明，气泡注入、纳米流体的应用和湍流器的使用使传热分别提高了 66%、74% 和 17%。此外，同时使用这三种方法将传热率从 33% 提高到 144%。最后，利用 TEF 因子选择了最佳情况。