Analysis and modelling of bead contacts in wet-operating stirred media and planetary ball mills with CFD–DEM simulations

Beinert, S.; Fragnière, Greta; Schilde, Carsten; Kwade, Arno

doi:10.1016/j.ces.2015.05.063

Cited by 68 publications

(37 citation statements)

References 28 publications

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“…Detailed insight into the acting stress mechanisms can be only provided by simulation experiments. Beinert et al presented a computational fluid dynamics/discrete element method (CFD‐DEM) approach with extended contact analysis to distinguish between the different acting contact types: impact, torsion, shearing, and rolling in media mills . Future work has to be focused on simulative investigations to differentiate between the influences of these stress mechanisms.…”

Section: Resultsmentioning

confidence: 99%

“…Another approach, which is mainly based on shear effects due to geometrical and viscous product properties, was developed by Martins and Radziszewski . Other possibilities to get access to acting forces are provided by simulation experiments, which are often limited by the computing capacity and, thus, are only applicable to small processing volumes . Moreover, the calculation of population balances enables the prediction of particle size distribution changes .…”

Section: Introductionmentioning

confidence: 99%

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Scaling Wet Fine Grinding Processes of Organic Particles Using Stirred Media Mills

Flach

Breitung‐Faes

Kwade

2017

Chemie Ingenieur Technik

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This study presents an approach to scale up wet fine grinding processes of organic particles using stirred media mills. The process transfer is based on the calculation of grinding‐relevant energy, which is transferred to the product by a model theory derived from mill‐related values, especially geometric aspects. Its application was demonstrated by experimental work with two organic products, which were ground with different sizes and geometries of mills reaching from 20 to 900 mL grinding chamber volume under variation of process parameters.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Scaling Wet Fine Grinding Processes of Organic Particles Using Stirred Media Mills

Flach

Breitung‐Faes

Kwade

2017

Chemie Ingenieur Technik

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“…Figure 5 shows on example of how DEM and SPH are coupled in this type of simulation. DEM-CFD (e.g., the k--turbulence model) methods have also been applied to wet grinding, such as stirred media and planetary ball mills [54]. Similar to DEM-SPH methods, here, CFD takes the fluid flow into account and DEM is used for modeling of the grinding media.…”

Section: Computational Fluid Dynamics (Cfd) In Multiphase Systemsmentioning

confidence: 99%

Trends in Modeling, Design, and Optimization of Multiphase Systems in Minerals Processing

2019

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Multiphase systems are important in minerals processing, and usually include solid–solid and solid–fluid systems, such as in wet grinding, flotation, dewatering, and magnetic separation, among several other unit operations. In this paper, the current trends in the process system engineering tasks of modeling, design, and optimization in multiphase systems, are analyzed. Different scales of size and time are included, and therefore, the analysis includes modeling at the molecular level (molecular dynamic modeling) and unit operation level (e.g., computational fluid dynamic, CFD), and the application of optimization for the design of a plant. New strategies for the modeling, design, and optimization of multiphase systems are also included, with a strong focus on the application of artificial intelligence (AI) and the combination of experimentation and modeling with response surface methodology (RSM). The integration of different modeling techniques such as CFD with discrete element simulation (DEM) and response surface methodology (RSM) with artificial neural networks (ANN) is included. The paper finishes with tools to study the uncertainty, both epistemic and stochastic, based on uncertainty and global sensitivity analyses, which is present in all mineral processing operations. It is shown that all of these areas are very active and can help in the understanding, operation, design, and optimization of mineral processing that involves multiphase systems. Future needs, such as meso-scale modeling, are highlighted.

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“…vi. Several types of interactions can take place among moving beads, including impact, torsion, shearing and rolling (Beinert et al, 2015). Similarly, the interaction of colliding beads and cells can result in shear forces, compressive forces and impact forces (Pan et al, 2017).…”

Section: Vmentioning

confidence: 99%

“…However, the real nature of the collisions, flow regimes and the actual gradients of speeds at which collisions are taking place are unknown (Becker et al, 2001). For instance, the restitution coefficient (ratio of post-to pre-impact bead velocity) for 0.5 mm beads at α = 65 % for the system under investigation is 0.9 (Beinert et al, 2015). This means that < 1 % of the energy of collisions is dissipated to the fluid.…”

Section: Effective Disruption Energymentioning

confidence: 99%

Biorefinery of functional biomolecules from algae

García¹

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The disintegration of three industry relevant algae (Chlorella vulgaris, Neochloris oleoabundans and Tetraselmis suecica) was studied in a lab scale bead mill at different bead sizes (0.3 mm-1 mm). Cell disintegration, proteins and carbohydrates released into the water phase followed a first order kinetics. The process is selective towards proteins over carbohydrates during early stages of milling. In general, smaller beads led to higher kinetic rates, with a minimum specific energy consumption of ≤ 0.47 kWh kgDW-1 for 0.3 mm beads. After analysis of the stress parameters (stress number and stress intensity), it appears that optimal disintegration and energy usage for all strains occurs in the 0.3-0.4 mm range. During the course of bead milling, the native structure of the marker protein Rubisco was retained, confirming the mildness of the disruption process.

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Analysis and modelling of bead contacts in wet-operating stirred media and planetary ball mills with CFD–DEM simulations

Cited by 68 publications

References 28 publications

Scaling Wet Fine Grinding Processes of Organic Particles Using Stirred Media Mills

Scaling Wet Fine Grinding Processes of Organic Particles Using Stirred Media Mills

Trends in Modeling, Design, and Optimization of Multiphase Systems in Minerals Processing

Biorefinery of functional biomolecules from algae

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