A novel approach for determining the flow patterns in centrifuges by means of Laser-Doppler-Anemometry

Spelter, Lars Egmont; Schirner, Johannes; Nirschl, Hermann

doi:10.1016/j.ces.2011.05.022

Cited by 17 publications

(16 citation statements)

References 15 publications

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“…For the experimental investigation of flow conditions in centrifuges, the measurement of residence time distribution (RTD) and laser Doppler anemometry (LDA) are the most frequently used methods. The latter one was successfully applied to prove rigid body motion even at high circumferential velocities [5]. However, the resolution of low-velocity components (radial, axial) of LDA in the presence of very-high-velocity components (circumferential) is limited.…”

Section: Introductionmentioning

confidence: 99%

Centrifugal classification of ultrafine particles: Influence of suspension properties and operating parameters on classification sharpness

Konrath

Brenner

Dillner

et al. 2015

Separation and Purification Technology

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Section: Introductionmentioning

confidence: 99%

Centrifugal classification of ultrafine particles: Influence of suspension properties and operating parameters on classification sharpness

Konrath

Brenner

Dillner

et al. 2015

Separation and Purification Technology

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“…Due to the small width of a few millimeters and the high circumferential velocity in the centrifuge, the real profile cannot be measured with hot wire or Laser-DopplerAnemometers. 34 A comparison of the predicted separation efficiency using different flow profiles in the boundary layer flow with the experimental data is shown in Figure 11. The flow profiles are plotted in the inset of Figure 11.…”

Section: Solid-bowl Centrifugementioning

confidence: 98%

Pseudo two‐dimensional modeling of sediment build‐up in centrifuges: A compartment approach using compressional rheology

et al. 2013

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in Wiley Online Library (wileyonlinelibrary.com) Both a new modeling approach and new experimental data for the sediment build-up in centrifuges are presented. In semibatch apparatus, the suspension is continuously fed to the centrifuge, separating the particles inside the rotor and discharging the clarified liquid. The solid phase is removed once the capacity of the centrifuge is reached. The solids fraction of the sediment depends on the rheological properties of the cake. The sediment growth and consolidation throughout the process can be calculated using a pseudo two-dimensional approach that takes into account particle-size dependent settling, sediment compressibility, the centrifugal force field, and the geometry of the bowl. The predictions of the separation behavior and the particle-size distributions of the sediment and overflow are compared with experimentally obtained results, showing improved accuracy when compared to simpler models. The model presented is applicable to all solid-bowl centrifuges without conveying systems. V C 2013 American Institute of Chemical Engineers AIChE J, 59: [3843][3844][3845][3846][3847][3848][3849][3850][3851][3852][3853][3854][3855] 2013

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“…This led to particle tracks around wires, which reflected the separation of particles. on the wire end on centrifugal force influence, the magnetic field was read and implemented using eq (10). In the contact model, eq.…”

Section: The Centrifugal Forcementioning

confidence: 99%

“…This requires star-shaped matrices which are produced most easily by laser cutting. CFD simulations of centrifuges have already been made, particle tracks in centrifuges have already been calculated [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Simulation of magnetic suspensions for HGMS using CFD, FEM and DEM modeling

Lindner

Menzel

Nirschl

2013

Computers & Chemical Engineering

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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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A novel approach for determining the flow patterns in centrifuges by means of Laser-Doppler-Anemometry

Cited by 17 publications

References 15 publications

Centrifugal classification of ultrafine particles: Influence of suspension properties and operating parameters on classification sharpness

Centrifugal classification of ultrafine particles: Influence of suspension properties and operating parameters on classification sharpness

Pseudo two‐dimensional modeling of sediment build‐up in centrifuges: A compartment approach using compressional rheology

Simulation of magnetic suspensions for HGMS using CFD, FEM and DEM modeling

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