Samer Alzyod

OPOSSIM: A Population Balance-SIMULINK Module for Modelling Coupled Hydrodynamics and Mass Transfer in Liquid Extraction Equipment

Abstract Dynamic behaviour, control and design strategies for liquid extraction equipment are faced by the complex hydrodynamic behavior of the dispersed phase with many droplet interactions (e.g. breakage and coalescence). To take this into account, the population balance modelling framework is used by implementing the bivariate OPOSPM (One Primary and One Secondary Particle Method) with a one-dimensional finite volume method in the physical space. To narrow the gap between the steady state and dynamic design during process synthesis, OPOSPM is implemented in a MATLAB/Simulink flowsheeting environment. As an outcome of this, we present a new OPOSPM-MATLAB/Simulink module which is called OPOSSIM for modeling and simulation the coupled two-phase flow and mass transfer in a Kuhni liquid extraction column.

Dynamic modelling of Kühni liquid extraction columns using the sectional quadrature method of moments (SQMOM)

Abstract In this work, the Sectional Quadrature Method Of Moments (SQMOM) is extended to a one-dimensional physical spatial domain and resolved using the finite volume method. To close the mathematical model, the required quadrature nodes and weights are calculated using the analytical solution based on the Two Unequal Weights Quadrature (TUEWQ) formula derived by Attarakih et al. ( Attarakih, M., Drumm, C., & Bart, H.-J., (2009), Solution of the population balance equation using the Sectional Quadrature Method of Moments (SQMOM). Chemical Engineering Science, 64, 742–752 ). By applying the finite volume method to the spatial domain, we end up with a semi-discreet ordinary differential equation system which is solved using the MATLAB standard ODE solvers (ode45). As a case study, the SQMOM is used to investigate the dynamic behavior of a Kuhni DN150 liquid–liquid extraction column. As an independent validation step, the SQMOM prediction is compared with the PPBLab software which utilizes the extended fixed pivot technique as a built-in population balance model solver. Furthermore, the SQMOM is validated using the available dynamic experimental data from a Kuhni liquid extraction column using water-acetone-toluene chemical test system. The dynamic analyses of the Kuhni column show very interesting features concerning the coupled column hydrodynamics and mass transfer and the droplet breakage and coalescence as well.

CFD modelling of pulsed sieve plate liquid extraction columns using OPOSPM as a reduced population balance model

Abstract The simulation of pulsed sieve plate liquid-liquid extraction columns is performed by coupling a 2D-CFD simulation with a reduced population balance method. In this regard, the One Primary One Secondary Particle Method (OPOSPM) is utilized and implemented in Fluent 17.1 commercial software as a special case of the general Sectional Quadrature Method Of Moments (SQMOM). The droplet-droplet interactions (breakage and coalescence) are taken into account using OPOSPM, while the required information about the velocity field and energy dissipation is estimated by a CFD model. A positive validation of the column hydrodynamics behaviour is with experimental data at different operating conditions.

Population balance modelling of pulsed packed bed extraction columns using PPBLab software

Abstract In this work, we present a new population balance based module for modelling the hydrodynamics and mass transfer processes in pulsed packed bed liquid extraction columns. The new module is fully implemented using PPBLab software, which utilizes recent population balance model solution algorithms. In this regard, the PPBLab detailed and reduced extended fixed pivot solvers are used to discretize the internal coordinates, while the PPBLab built-in space-time solver is used to discretize the physical spatial domain. In addition to this, a user-friendly interface is designed to facilitate the user inputs and outputs and to allow a full access to the CAPE-OPEN thermodynamics package (TEA). As a case study, this PPBLab column module is validated using the published steady state experimental data for water-acetone-toluene chemical system in a DN80 pulsed packed bed liquid extraction column. The predicted column performance is found to agree well with PPBLab software simulation results.

Population Balance Modelling of Liquid Extraction Columns using the Sectional Quadrature Method of Moments (SQMOM)

Abstract In this work, the Sectional Quadrature Method Of Moments (SQMOM) is extended to solve the nonhomogeneous population balance equation along the spatial domain to model the hydrodynamics and mass transfer behaviour of liquid-liquid extraction columns. The required quadrature nodes and weights are calculated analytically using the Two-Equal Weight Quadrature (TEqWQ) formula derived by Attarakih et al., ( Attarakih, M., Drumm, C., & Bart, H.-J., (2009), Solution of the population balance equation using the Sectional Quadrature Method of Moments (SQMOM). Chem. Eng. Sci., 64, 742-752 ). As a numerical test, the SQMOM was validated using PPBLab software which utilizes the detailed extended fixed pivot as a built-in solver. Moreover, the SQMOM was experimentally validated using the available published steady state experimental data for both chemical test systems: Water-acetone-toluene and water-acetone-butyl acetate chemical test systems for RDC DN80 liquid extraction column.

CFD modelling of pulsed sieve plate liquid extraction columns using OPOSPM as a reduced population balance model: hydrodynamics and mass transfer

Abstract A reduced coupled 2D-CFD and Population Balance Model (PBM) framework (Alzyod et al., Comput. Aided Chem. Eng., 40, 61-66) is extended to model the mass transfer behaviour of pulsed sieve plate liquid extraction columns. The Euler-Euler approach is used to model the two phase flow inside the column, while the One Primary One Secondary Particle Method (OPOSPM), the simplest form of SQMOM, is utilized as a reduced population balance solver. The proposed framework is numerically tested and the results are compared with the published experimental data. The required breakage and coalescence parameters to perform the 2D-CFD simulation are estimated using PPBLab software, where a 1D-CFD simulation using a multi-sectional gird is performed. A very good agreement is obtained at the experimental and the numerical validation levels.