This study was conducted to investigate the flow and heat transfer characteristics of a flat plate located between two symmetrical cylinders. Flow visualization experiments were conducted based on the open-loop fluid test bench to verify the accuracy of numerical simulation. The effects of nondimensional vertical gap space (C/D) between the cylinder and the plate ranging from 0.1 to 0.8 were considered. Simulations were carried out at a fixed Reynolds number of 500. The numerical results show that the gap space is a key parameter of the flow and heat transfer characteristics. In cases of small gap space, a pair of large-scale vortices and different shapes of vortices are formed along with the plate. The heat transfer effect is improved in the upstream and downstream areas of the plate but deteriorated in the middle area. In cases of large gap space, large-scale vortices disappear and a single vortex is formed near the middle area of the plate, which improves the heat transfer effect there. For special cases of C/D = 0.3 and 0.6, the heat transfer enhancement caused by flow instability is discussed in detail. These results could provide theoretical guidance for the design of heat exchanger equipment.

本研究旨在研究位于两个对称圆柱体之间的平板的流动和传热特性。基于开环流体试验台进行流动可视化实验，验证数值模拟的准确性。考虑了圆柱和板之间的无量纲垂直间隙空间 (C/D) 在 0.1 到 0.8 之间的影响。模拟是在固定雷诺数 500 下进行的。数值结果表明间隙空间是流动和传热特性的关键参数。在间隙空间较小的情况下，会随着板形成一对大范围的漩涡和不同形状的漩涡。板片上下游传热效果提高，中部传热效果变差。在间隙空间较大的情况下，大尺度涡流消失，在板中部附近形成单个涡流，提高了那里的传热效果。对于 C/D = 0.3 和 0.6 的特殊情况，详细讨论了流动不稳定性引起的传热增强。这些结果可为换热设备的设计提供理论指导。