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利用Fluent软件分别对光管、单头螺旋槽管及双头螺旋槽管传热及管内流动情况进行模拟,得到了湍流状态下管内流场分布云图,并从场协同理论出发,分析了螺旋槽管强化传热机理.仿真结果显示,在低雷诺数条件下,螺旋槽使管内产生较多的二次流,速度在横截面上的分量增加,努塞尔数保持为光管的1.6~2.2倍,换热性能优于光管,并且双头螺旋槽管的换热性能要优于单头螺旋槽管.但随着雷诺数的增加,场协同角逐渐接近90°,努塞尔数增加趋势变缓,换热性能增加量变缓,而且当雷诺数较高时,螺旋槽管的阻力系数急剧上升,换热性能不及光管.
Fluent software was used to simulate the heat transfer and tube flow in the light pipe, the single-head spiral grooved pipe and the double-headed spiral grooved pipe respectively. The flow field distribution in the pipe under turbulent flow was obtained. Based on the field coordination theory, The results show that under the condition of low Reynolds number, the helical groove produces more secondary flow in the tube, and the component of velocity increases in the cross section. The Nusselt number is kept at 1.6 ~ 2.2 The heat transfer performance is better than that of the light pipe, and the heat transfer performance of the double helix grooved pipe is better than the single helical grooved pipe, but with the increase of the Reynolds number, the field synergy angle gradually approaches 90 °, Nusselt number increases The trend becomes slower, the increase of heat transfer performance becomes slower, and when the Reynolds number is higher, the coefficient of resistance of the spiral groove tube rises sharply, and the heat transfer performance is less than that of the light pipe.