Computational fluid dynamics – population balance (CFD-PB) simulations are performed to predict Sauter mean drop diameter and dispersed phase holdup for liquid–liquid two-phase flow in a pulsed disc and doughnut column (PDDC). The continuity and momentum equations of the two-phases along with standard k–ε mixture model of turbulence and an appropriate model for interphase momentum exchange are solved to obtain temporal and spatial variations of dispersed phase holdup. Sauter mean drop diameter is obtained from Quadrature Method of Moments (QMOM)-based population balance model (PBM) which is solved along with the flow equations and takes into account coalescence and breakage of droplets. CFD-PB model is validated with the experimental data of Sauter mean drop diameter and dispersed phase holdup obtained for different pulsing velocities. Validated model is used to have detailed insights into the two-phase hydrodynamics prevalent inside the PDDC and to test the efficacy of scale-up methodology reported in literature.

进行计算流体动力学–种群平衡（CFD-PB）模拟，以预测脉冲圆盘和甜甜圈柱（PDDC）中液-液两相流的Sauter平均液滴直径和分散相滞留率。两相的连续性和动量方程以及标准k求解了湍流的-ε混合模型和相间动量交换的适当模型，以获得分散相滞留的时间和空间变化。Sauter平均液滴直径是从基于矩量法（QMOM）的总体平衡模型（PBM）获得的，该模型与流量方程一起求解，并考虑了液滴的聚结和破裂。CFD-PB模型通过获得不同脉动速度的Sauter平均液滴直径和分散相保持率的实验数据进行验证。经过验证的模型可用于深入了解PDDC内部普遍存在的两相流体动力学，并测试文献中报道的按比例放大方法的有效性。