螺旋套管式换热器内流体流动及强化传热分析

Analysis of Fluid Flow and Heat Transfer Enhancement in Spiral Casing TypeHeat Exchanger

本文运用Fluent软件对截面带有不同结构参数的螺旋套管式换热器壳侧强化通道模型进行了数值模拟运算,并对所得数据进行处理,分析了内管螺纹槽深、螺纹缠绕圈数对螺纹螺旋管传热和阻力性能的影响,得出了以下主要研究结论:加有不同螺纹槽深、不同螺纹缠绕圈数的螺旋管通道内的速度和温度分布更加混乱、变化更加快,温度和速度的最大值更大。而且,同一雷诺数下,随着螺纹槽深、缠绕圈数的增大,截面上的努赛尔数值更大,摩擦系数更大。

In this paper,the numerical simulation on the different helical ducts with different parameters of the screw are carried out by using Fluent software.On basis of the results,the effects of Reynolds number,thread groove depth,thread winding circle number,the helical flow direction on heat transfer and frictional factor are analyzed,and a series of useful conclusions are drawn.The main results are:the speed and the temperature distribution of the spiral tube channels with different thread groove depth and the number of different screw threads are more chaotic and the speed of the change is faster,the temperature and the speed of the screw pipe are greater.And under the same Reynolds number,with the increase of the groove depth and the number of the winding ring of the thread,The Nusselt number of the cross section is larger,and the friction coefficient is bigger.