旋转式混合器内流场数值模拟及研究

Simulation and Study of Flow in Several Rotating Mixing Element

通过对旋转式Kenics混合元件、间断螺纹混合元件和交错平板混合元件引入CFD数值模拟,比较了高黏度不可压缩流体在不同流量、转速、元件单元数、机筒间隙、长径比下三种旋转式混合器内的应变速率。结果表明,增大入口处流量和转动轴转速,增加元件单元数,减少混合元件与机筒间间隙以及长径比,都有利于提高混合器内的平均应变速率,增强混合效果,在相同条件下间断螺纹元件混合效果最好;不同结构的混合元件存在最优结构参数组合。

By the application of CFD technology to rotating Kenics mixing element, screw element and crossing plate element, the strain rote of high viscosity and non-compressible flow under different throughput, rotating speed, element numbers, gap between element and wall, and L/D ratio was discussed. The results showed average strain rate and mixing efficiency increased with the increase of the throughput, rotating speed, element numbers, but the decrease of the gap and L/D ratio. At same conditions, the mixing efficiency of the screw element was the highest, and the elements had optimum geometry parameters.