LAPSE:2021.0081
Published Article
LAPSE:2021.0081
CFD-DEM Simulation of a Coating Process in a Fluidized Bed Rotor Granulator
Philipp Grohn, Marius Lawall, Tobias Oesau, Stefan Heinrich, Sergiy Antonyuk
February 22, 2021
Coating of particles is a widely used technique in order to obtain the desired surface modification of the final product, e.g., specific color or taste. Especially in the pharmaceutical industry, rotor granulators are used to produce round, coated pellets. In this work, the coating process in a rotor granulator is investigated numerically using computational fluid dynamics (CFD) coupled with the discrete element method (DEM). The droplets are generated as a second particulate phase in DEM. A liquid bridge model is implemented in the DEM model to take the capillary and viscous forces during the wet contact of the particles into account. A coating model is developed, where the drying of the liquid layer on the particles, as well as the particle growth, is considered. The simulation results of the dry process compared to the simulations with liquid injection show an important influence of the liquid on the particle dynamics. The formation of liquid bridges and the viscous forces in the liquid layer lead to an increase of the average particle velocity and contact time. Changing the injection rate of water has an influence on the contact duration but no significant effect on the particle dynamics. In contrast, the aqueous binder solution has an important influence on the particle movement.
Keywords
capillary force, CFD-DEM simulation, coating model, drying process, fluidized bed rotor granulator, viscous force, wet particle
Suggested Citation
Grohn P, Lawall M, Oesau T, Heinrich S, Antonyuk S. CFD-DEM Simulation of a Coating Process in a Fluidized Bed Rotor Granulator. (2021). LAPSE:2021.0081
Author Affiliations
Grohn P: Institute of Particle Process Engineering, Technische Universität Kaiserslautern, Gottlieb-Daimler-Straße 44, 67663 Kaiserslautern, Germany
Lawall M: Institute of Particle Process Engineering, Technische Universität Kaiserslautern, Gottlieb-Daimler-Straße 44, 67663 Kaiserslautern, Germany
Oesau T: Institute of Solids Process Engineering and Particle Technology, Hamburg University of Technology, Denickestraße 15, 21073 Hamburg, Germany
Heinrich S: Institute of Solids Process Engineering and Particle Technology, Hamburg University of Technology, Denickestraße 15, 21073 Hamburg, Germany [ORCID]
Antonyuk S: Institute of Particle Process Engineering, Technische Universität Kaiserslautern, Gottlieb-Daimler-Straße 44, 67663 Kaiserslautern, Germany
Journal Name
Processes
Volume
8
Issue
9
Article Number
E1090
Year
2020
Publication Date
2020-09-02
Published Version
ISSN
2227-9717
Version Comments
Original Submission
Other Meta
PII: pr8091090, Publication Type: Journal Article
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LAPSE:2021.0081
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doi:10.3390/pr8091090
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Feb 22, 2021
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CC BY 4.0
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[v1] (Original Submission)
Feb 22, 2021
 
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Feb 22, 2021
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Original Submitter
Calvin Tsay
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