Multiscale Analysis of a Coating Process in a Wurster Fluidized Bed Apparatus

First published in
Advances in chemical engineering  
Number in series
46
Start Page
83
End Page
135
Citation
Advances in Chemical Engineering 46: 83-135 (2015)
Publisher DOI
10.1016/bs.ache.2015.10.012
Scopus ID
2-s2.0-84949032762
ISBN of container
978-0-12-801247-5
978-0-12-801354-0
This contribution outlines a multiscale simulation approach for analysis of a Wurster coating process occurring in a fluidized bed. The processes occurring in the apparatus are described on four different time and length scales: The Discrete Element Method coupled with Computational Fluid Dynamics, where each particle is considered as a separate entity and its motion in fluid field is calculated, play a central role in the modeling framework. On the macroscale, the Population Balance Model describes the particle growth. The nozzle zone model calculates the wetting and overspray rate on the mesoscale. The model on the lowest scale predicts the impact behavior of wetted particles. The influence of key processing parameters, such as gap distance or atomization air flow, on the particle-fluid dynamics during coating process is analyzed. In order to get material parameters, such as coefficient of restitution and friction, a set of experimental investigations of a model material is performed.
Subjects
Coating
Computational Fluid Dynamics
Discrete Element Method
Fluidized bed
Multiscale simulation
Wurster coater
DDC Class
600: Technology