螺旋扭曲扁管式换热管流体流动及传热特性的CFD仿真

CFD simulation of fluid flow and heat transfer characteristics in the twisted heat exchange tube

从理论上分析了烟气余热回收装置螺旋扭曲扁管式换热管的机理。利用CFD软件,研究了螺旋扭曲扁管式换热管管程内流体流动及传热特性,并对换热管传热性能的影响因素进行探讨。结果表明:相同操作工况下,螺旋扭曲扁管传热性能强于直椭圆管、普通圆管;扭曲比在影响螺旋扭曲扁管传热性能中有最佳值;螺旋扭曲扁管在不同扁度及流动状态下,扁度及雷诺数越大,强化传热效果越好。

The mechanism of the twisted tube in the flue gas waste heat recovery unit was theoretically analyzed. The characteristics of fluid flow and heat transfer in the tube-side of the heat exchange tube were studied with CFD software,and the factors that affect the heat transfer performance of heat exchange tubes were discussed. The results of simulation show： under the same operating conditions,the heat transfer performance of twisted tube is better than that of straight oval tube and circular tube; the twist ratio has the best value in the heat transfer performance of twisted tubes; the greater the flatness and Reynolds number,the better the heat transfer effect is.