SK型静态混合器停留时间分布特性研究

结合脉冲示踪法利用计算流体力学方法的雷诺时均方程（RNAS）和重整化群的k-ε湍流模型计算SK型静态混合器内的浓度响应曲线。基于正交实验原理分析流体在不同混合元件长径比、不同监测位置及不同的进口流速下的停留时间分布特性，并计算了平均停留时间和方差来研究各因素之间影响顺序。结果表明，SK型静态混合器内的液体单相流动的轴向返混系数较小且数量级均为10^-2流动状态接近活塞流；平均停留时间随流体流速的增大而减小，随混合器长度和混合元件长径比的增加而增大。

Numerical Simulation of Residence Time Distribution in Kenics Static Mixer

The concentration response curves were calculated based on pulse tracer input technique by means of CFD method adopted RANS equations and renormalization group k-ε turbulence model. The characteristic of residence time distribution measured at different outlet with different inlet velocities and aspect ratios were ealeulated and analyzed by orthogonal experiment, and the orders of factors were ranked by the range analysis of mean value and square deviation. The results show that the order of axial back mixing coefficient is 10^- 2, and the flowing state of the fluid in the kenics static mixer approaches plug flows. The mean residence time decreases with increasing flow rate of the fluid and increases with the increasing length and aspect ratio of the static mixers.