十二排圆形翅片管换热器的传热与流动特性研究

采用数值计算方法研究12排大管圆形翅片表面空气侧流体的流动特性，获得不同雷诺数下圆形翅片的速度分布云图、温度分布云图和流线分布图，并将模拟的结果与实验和实验关联式分别进行验证。研究结果表明：翅片间距为9.6mm第一排管壁侧和翅片表面的传热系数分别是翅片间距为2.4mm的1.67和0.97倍；前面六排翅片表面和管壁表面的传热系数具有很强的波动，而在第六排后翅片表面和管壁表面的传热系数趋向于稳定。

Flow Behavior and Heat Transfer Characteristics of Circular Finned Tube Heat Exchangers with Twelve-row

The airside flow performance of circular finned-tube with twelve-row heat exchangers is numerical investigated in this study. The velocity field, temperature field and streamlines are obtained and the result of the simulation study is compared with the experimental result and the experimental correlation. The research findings show that the heat transfer coefficient of the fin surface and the tube surface of the first row with fin spacing of 9.6mm are 1.67 and 0.97 times with the fin spacing of 2.4mm. And the heat transfer coefficients of the single fin surface and tube surface before the sixth row are strongly fluctuating, and when the number of the in-depth bundles is greater than six, the heat transfer coefficients of single fin surface and tube surface are almost consistent with going deeper into the bundles.