Abstract Presented is a detailed assessment of dispersive mixing and turbulence characterisation of an industrially representative pulsed sieve-plate extraction column (PSEC) obtained using multiphase CFD modelling. The system consists of a 150 mm diameter column with two perforated plates dispersing a 30 vol% dodecane/tributyl phosphate mixture in 3 M nitric acid. Operational conditions were chosen to examine pseudo steady-state dispersion regime operation. Three-dimensional transient flow calculations were performed using large eddy simulation (LES), coupled with the volume of fluid method. This study finds that LES is effective at capturing the different scales of turbulence present within PSECs, and their operational influence. Explicit analysis of the hydrodynamics established that the sieve-plates drive dispersive mixing through their influence on the resulting turbulent flow and flow structures. Furthermore, the standard round-hole sieve-plate design is found to perform poorly at producing and distributing the types of flow and turbulence beneficial to droplet size reduction.

中文翻译：

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流体动力学对脉冲筛板萃取塔设计的影响：使用流体体积法的单流体多相 CFD 模型

摘要 介绍了使用多相 CFD 建模获得的具有工业代表性的脉冲筛板萃取塔 (PSEC) 的分散混合和湍流特征的详细评估。该系统由一个直径为 150 mm 的柱子和两个多孔板组成，这些孔板将 30 vol% 的十二烷/磷酸三丁酯混合物分散在 3 M 硝酸中。选择操作条件来检查伪稳态色散状态操作。使用大涡模拟 (LES) 结合流体体积法进行三维瞬态流动计算。本研究发现，LES 在捕捉 PSEC 中存在的不同尺度湍流及其操作影响方面是有效的。对流体动力学的明确分析表明，筛板通过对产生的湍流和流动结构的影响来驱动分散混合。此外，发现标准的圆孔筛板设计在产生和分配有利于液滴尺寸减小的流动和湍流类型方面表现不佳。