Advances in Simulation of Liquid-Liquid Two-phase Flow in Extraction Columns with CFD-PBM
萃取柱内液-液两相流CFD-PBM模拟研究进展

A detailed review on the CFD-PBM research in the extraction columns is presented,including the fundamental theory,different solution methods,and status of the simulation research.The basic equations in the CFD-PBM simulation contain the flow equations and the population balance equation,which are coupled with each other.Coalescence and break-up models are two important models in the population equation.The methods to solve the population balance equation include the class method,the method of moments,the quadrature method of moments,the direct quadrature method of moments,and the sectional quadrature method of moments.The fundamental,advantages and disadvantaged of these methods were reviewed.The Eulerian-Eulerian method is mainly used in the CFD simulation of the two-phase flow in extraction columns to date.The PBM which considers the droplet size distribution and further the concentration distribution is relatively less used in extraction columns.To improve the PBM in a liquid-liquid dispersion system with mass transfer and to use the model in different types of extraction columns are important issues for extraction research.