For detailed simulation and evaluation of stirred extraction columns a CFD based compartment‐model was developed. Instead of simulating all effects in a computational expensive PBE‐CFD‐model, the velocity field calculation of the continuous phase is decoupled from the calculation of the dispersed phase (one‐way coupling). In CFD only the continuous phase is simulated and the resulting velocity profile is used in the compartment‐model to simulate the drop movement, coalescence, breakage and mass transfer for a representative number of drops (Monte‐Carlo Method). This decoupling has a major impact on the calculated fluid‐dynamics. Thus, the velocity profile of the CFD results is modified in the model to account for phase interaction. The compartment‐model is applied for the simulation of a Kühni extraction column with the system toluene/water/acetone. The simulation results, namely holdup, drop size and concentration profiles over the column height, are in good agreement with experiments for different loads and different stirrer speeds.

中文翻译：

---

用于模拟搅拌液-液萃取塔分离性能的区室模型

为了对搅拌萃取塔进行详细的模拟和评估，开发了基于CFD的隔室模型。与其在计算昂贵的PBE-CFD模型中模拟所有效应，不如将连续相的速度场计算与分散相的计算解耦（单向耦合）。在CFD中，仅模拟连续相，并且在隔室模型中使用所得的速度曲线来模拟代表数量的液滴的液滴运动，聚结，破裂和传质（蒙特卡洛方法）。这种解耦对计算出的流体动力学有重大影响。因此，在模型中修改了CFD结果的速度分布，以解决相位相互作用。隔室模型用于使用甲苯/水/丙酮系统模拟Kühni萃取塔。模拟结果，即在色谱柱高度上的保留率，液滴大小和浓度曲线，与针对不同负载和不同搅拌器速度的实验非常吻合。