Please cite this article as: Lindner, J., Menzel, K., & Nirschl, H., Simulation of magnetic suspensions for HGMS using CFD, FEM and DEM modeling, Computers and Chemical Engineering (2013), http://dx.doi.org/10. 1016/j.compchemeng.2013.03.012 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Page 1 of 38A c c e p t e d M a n u s c r i p t Properties of magnetic suspensions depend on the fluid, the particles and the magnetic background field. 8The simulation is aimed at understanding the influence of magnetic properties in High Gradient Magnetic 9 Separation processes. In HGMS magnetic particles are collected on magnetic wires for separation. External 10 magnetic forces are calculated or simulated using the Finite Element Method and embedded first in a 11Computational Fluid Dynamics simulation. In the simulation, elliptic and rectangular wires aligned in field 12 direction reach higher separation efficiencies than cylindrical wires. Magnetic forces from FEM with 13 implemented dipole forces in a Discrete Element Method code show magnetically induced agglomeration 14 and yield an acceptable agreement with experiments. Particle deposition on wires is investigated under the 15 influence of different parameters. The porosity of the deposit is dependent on the magnetization of the 16 wire and particles. A centrifugal force of 60 g has an important influence.

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In order to separate small magnetizable particles down to the micro-and nanometer scale, high-gradient magnetic separation is a well-established process. The superposition of magnetic filtration with centrifugation, called magnetic field-enhanced centrifugation, permits continuous separation. The separation efficiency of magnetic filters and the prediction of the efficiency is described. The separation efficiency of one single stage could be enhanced from 51 to 78 % by increasing the wire number and improving the wire cross section. The separation efficiency on different particle sizes at different filter stage numbers and comparison to the prediction of separation efficiency based on magnetic forces and the fluid drag force is demonstrated.