CFD modelling of the Wurster bed coater.
Artikel i vetenskaplig tidskrift, 2009

In the Wurster bed coater, the wetting, drying, and circulation of particles are combined to produce a high quality coating. The drying and wetting conditions in a laboratory scale Wurster bed coater are modeled and compared with experimental data. A model combining multiphase fluid dynamics with heat and mass transfer is developed to model the particle and gas motion and the transport of thermal energy and moisture. A wetting region is defined, where a specified moisture content is set in the particle phase, above the jet inlet, to describe the injection ofcoating liquid. The simulation shows the characteristic circulation of particles in the equipment, as well as the behavior of the moisture in the system and agrees well with measurements. The simulation indicates how different process conditions influence the drying regions. The results show that most ofthe drying, under typical operating conditions, takes place in the Wurster tube. © 2009 American Institute of Chemical Engineers.

Fluidized bed

Wurster

Drying

CFD

Coating

Författare

Stina Karlsson

Chalmers, Kemi- och bioteknik, Kemisk apparatteknik

Anders Rasmuson

Chalmers, Kemi- och bioteknik, Kemisk apparatteknik

Berend van Wachem

Chalmers, Tillämpad mekanik, Strömningslära

Ingela Niklasson Björn

AstraZeneca AB

AICHE Journal

0001-1541 (ISSN) 1547-5905 (eISSN)

Vol. 55 10 2578-2590

Ämneskategorier

Kemiteknik

DOI

10.1002/aic.11847