三角形纵向涡在管翅式换热器的应用及优化

Application and Optimization of Triangular Longitudinal Vortex in Fin and Tube Heat Exchangers

纵向涡能够在增加管翅式换热器换热系数,同时较小幅度地增加其流动阻力。本文通过对4种结构的翅片(未进行任何处理的平翅片,结构为高为H3/6、H4/6、H5/6且攻角为30°长高比为2)进行数值模拟。结果显示安装纵向涡发生器的翅片的传热系数明显增强,且最高增加49%。在换热系数增加的同时阻力系数j也有明显的增加。其中安装纵向涡H5/6型翅片的阻力因子增加最小与平翅片几乎相同。最后本文通过对综合评价因子j/f的比较得知安装H5/6型纵向涡翅片具有最好的综合效果。

The longitudinal vortex can increase heat transfer coefficient of the fin and tube heat exchanger, and the flow resistance increases slightly. In this paper, numerical simulation on the fin and tube heat exchanger with 4 kinds of different structure fins （plain fin,H3/6,H4/6 and H5/6） was carried out. The results show that the heat transfer coefficient of the fin and tube heat exchanger with the longitudinal vortex generator is obviously increased, and the highest increase reaches 49%, at the same time resistance coefficient J also has obvious increase. The resistance factor of the fin and tube heat exchanger with the longitudinal vortex H5/6 fin has minimal increase;it is almost the same with that with plain fin. Finally, it’s pointed out that the fin and tube heat exchanger with H5/6 type longitudinal vortex fin has the best comprehensive effect.