The petal-type vortex generator inserted tube was proposed in this paper to explore higher heat transfer performance. The k-ω model was selected and a good agreement can be obtained. Basically, the influences of the interval distance t, the angle α and the pitch P were meticulously examined within a Reynolds number spectrum ranging from 5000 to 15,000. The analysis of the internal flow dynamics revealed that the petal-type vortex generator effectively transformed the longitudinal velocity of the fluid into radial velocity, leading to the formation of vortices within the tube. The petal-shaped vortex generators led a portion of the fluid toward the tube surface, facilitating boundary layer weakening and redevelopment near the wall, while also allowing another portion of the fluid to pass through the slits, which enhanced the generation of vortices and significantly improved heat transfer performance. The numerical results indicated that the tube equipped with petal-type vortex generator insert achieved a 196–347 % increase in the Nusselt number (Nu) and a 244–1149 % increase in the friction factor (f), relative to a smooth tube. The maximum performance evaluation criterion (PEC) obtained in this study reached 2.01.

中文翻译：

---

花瓣式涡流发生器插入管换热器热水性能研究


本文提出了花瓣型涡流发生器插入管，以探索更高的传热性能。选择了 k-ω 模型，可以获得良好的一致性。基本上，区间距离 t、角度 α 和螺距 P 的影响是在 5000 到 15,000 的雷诺数谱中仔细检查的。对内部流动动力学的分析表明，花瓣型涡流发生器有效地将流体的纵向速度转化为径向速度，导致管内形成涡流。花瓣形涡流发生器将一部分流体引向管表面，促进边界层在壁附近变弱和重建，同时还允许另一部分流体通过狭缝，从而增强涡流的产生并显着提高传热性能。数值结果表明，与光滑管相比，配备花瓣型涡流发生器嵌件的管子的努塞尔数 （Nu） 增加了 196-347%，摩擦系数 （f） 增加了 244-1149%。本研究获得的最大性能评价标准 （PEC） 达到 2.01。