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

Spelter, Lars Egmont; Nirschl, Hermann; Stickland, Anthony D.; Scales, Peter J.

doi:10.1002/aic.14115

Cited by 16 publications

(12 citation statements)

References 26 publications

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“…However, the rheological behavior of the sediment also influences strongly the sediment shape [4,5]. Neglecting the sediment buildup, the theoretically predicted separation efficiency deviates significantly from the experimentally measured efficiency.…”

Section: Introductionmentioning

confidence: 78%

An Efficient Numerical Approach for Transient Simulation of Multiphase Flow Behavior in Centrifuges

et al. 2017

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Solid bowl centrifuges are applied for the separation of small particles in a variety of industries. However, the particles accumulate at the rotor wall, which leads to a time-dependent separation efficiency. A numerical approach for spatial and timeresolved simulations of the separation process in a tube centrifuge is developed and some numerical results are presented. The back coupling of the dispersed and sedimented particles is realized by locally defined viscosity functions. The open source computation software OpenFOAM was used to simulate the turbulent multiphase flow within the centrifuge. The numerical investigations demonstrate the significant influence of the growing sediment on the flow conditions and of the rheological behavior of the sediment on the sediment shape.

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Section: Introductionmentioning

confidence: 78%

An Efficient Numerical Approach for Transient Simulation of Multiphase Flow Behavior in Centrifuges

et al. 2017

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“…The modeling effort for process centrifuges increases significantly compared to static thickeners and batch centrifugation. The reason can be found in the complex flow conditions of the operated apparatus . The main flow direction of the fluid is not opposite to sedimentation as for thickeners, but in the direction of the existing overflow weir.…”

Section: Dynamic Modeling Of the Process Level And Real‐time Simulationsmentioning

confidence: 99%

Modeling and Simulation of Solid‐Bowl Centrifuges as an Aspect of the Advancing Digitization in Solid‐Liquid Separation

2019

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As a part of the Industry 4.0 initiative, the level of digitization in the process industry is increasing. Through a close link between analytics and dynamic modeling, digitization enables the optimization of processes and the model predictive control. In the field of solid-liquid separation using centrifuges, the advancing digitization forces the development of methods for computational fluid dynamics (CFD) and short-cut models to deepen process understanding and process intensification. CFD should be seen as support for experiments to develop suitable short-cut models for the process simulation. Based on the prerequisites, this article describes the development of dynamic models and their application using the example of solid bowl centrifuges. Therefore, the particulate level is first addressed by discussing critical material properties. Afterwards, the developed numerical algorithms to investigate centrifuges on different time and length scales will be presented. Finally, the mathematical modeling on the process level by using short-cut models is shown and discussed for decanter and tubular centrifuges.

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“…Der Detailgrad der Modellierung von Prozesszentrifugen steigert sich im Vergleich zu statischen Eindickern und der Batch‐Zentrifugation deutlich. Der Grund ist im abweichenden Strömungsverhalten der betriebenen Apparate zu finden . Die Hauptströmungsrichtung des Fluids ist nicht wie für Eindicker entgegengesetzt der Sedimentation, sondern in Richtung des vorhandenen Überlaufwehrs.…”

Section: Dynamische Modellierung Der Prozessebene Und Echtzeit‐simulaunclassified

Modellierung und Simulation von Vollmantelzentrifugen als ein Aspekt der voranschreitenden Digitalisierung in der Fest/Flüssig‐Trennung

Hammerich

Gleiß

Nirschl

2018

Chemie Ingenieur Technik

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Im Zuge der Initiative Industrie 4.0 erhöht sich der Digitalisierungsgrad auch in der Prozessindustrie. Eine enge Verknüpfung von Analyseverfahren und dynamischer Prozessmodelle erlaubt die Optimierung der Prozesskontrolle und Steuerung auch in der industriellen Trenntechnik. Zu diesem Zweck müssen mathematische Modelle zur Beschreibung der Prozessebene in Echtzeit bekannt sein. Im Bereich der Fest/Flüssig‐Trennung erzwingt die voranschreitende Digitalisierung die Entwicklung von numerischen Methoden und von Short‐cut‐Modellen zur Vertiefung des Prozessverständnisses und der besseren Auslegung der Anlagen. Aufgelöste Strömungssimulationen dienen hier als Unterstützung zu Experimenten und zur Ableitung geeigneter Short‐cut‐Modelle. Am Beispiel von Vollmantelzentrifugen wird die Entwicklung dynamischer Prozessmodelle und deren Anwendung beschrieben.

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

Cited by 16 publications

References 26 publications

An Efficient Numerical Approach for Transient Simulation of Multiphase Flow Behavior in Centrifuges

An Efficient Numerical Approach for Transient Simulation of Multiphase Flow Behavior in Centrifuges

Modeling and Simulation of Solid‐Bowl Centrifuges as an Aspect of the Advancing Digitization in Solid‐Liquid Separation

Modellierung und Simulation von Vollmantelzentrifugen als ein Aspekt der voranschreitenden Digitalisierung in der Fest/Flüssig‐Trennung

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