In the present study, the effect of conical obstacles on heat transfer and flow characteristics in a circular tube was investigated. In most previous studies, stationary obstacles were used to stimulate the flow and to investigate heat transfer and pressure drop. In the present paper, in addition to investigating the effect of a stationary obstacle, the effect of using moving obstacles was studied, both empirically and numerically, as a new topic on heat transfer and pressure drop in turbulent flow inside the pipe. In this study, the rotating speed of the obstacle ranged from 50 to 100 rpm, and the $\mathit{Re}$ ranged from 4000 to 24,000. The results revealed that the heat transfer and friction factor changed by 2.2–3.95 and 17.2–22.2 times relative to the smooth tube, respectively. Also, the thermal performance coefficient was 120% more than the stationary obstacles. According to the findings of the current study, studying the effect of obstacle rotation on thermohydraulic characteristics is an innovative and useful topic. Altogether, besides its easy construction, compared to previous reports, the conical obstacle is a suitable obstacle that can be employed to improve thermal performance.

在本研究中，研究了圆锥形障碍物对圆管中传热和流动特性的影响。在以前的大多数研究中，固定障碍物用于刺激流动并研究传热和压降。在本文中，除了研究静止障碍物的影响外，还从经验和数值上研究了使用移动障碍物的影响，作为管道内湍流传热和压降的新课题。在本研究中，障碍物的旋转速度范围为 50 到 100 rpm，并且$\mathit{关于}$从 4000 到 24,000 不等。结果表明，相对于光滑管，传热系数和摩擦系数分别变化了 2.2-3.95 倍和 17.2-22.2 倍。此外，热性能系数比静止障碍物高 120%。根据目前的研究结果，研究障碍物旋转对热工水力特性的影响是一个创新且有用的课题。总而言之，除了易于构建之外，与之前的报道相比，锥形障碍物是一种合适的障碍物，可用于提高热性能。