Statistical modelling of the spouted bed coating process using positron emission particle tracking (PEPT) data
Seiler, C., Fryer, P. and Seville, J. P. K. (Jonathan P. K.). (2008) Statistical modelling of the spouted bed coating process using positron emission particle tracking (PEPT) data. Canadian Journal of Chemical Engineering, Vol.86 (No.3). pp. 571-581. ISSN 0008-4034Full text not available from this repository.
Official URL: http://dx.doi.org/10.1002/cjce.20053
Coating of particles larger than about 1 mm can be achieved in a spouted bed, a particle mobilization device in which a strong particle circulation occurs, rapidly upwards in a lean central "spout" region and downwards in a slowly moving annular settled bed. In a spouted bed coater, a spray nozzle is placed at the base of the spout, spraying upwards into a distinct coating zone. The coating formation in a spouted bed is inter alia a function of (i) the particle motion, that is, how often and where particles enter and traverse the coating zone and (ii) the extent of droplet collection by individual particles passing through the coating zone.
The coating model proposed here is based on the statistical history of individual particles, whose projected area governs the collection of spray droplets in the coating zone. Positron emission particle tracking (PEPT) has been used to determine the particle trajectories, the distribution of cycle times and the size and voidage of the spout. Whilst the model is not capable of delivering absolute values of coating mass a priori, it can predict deviations from a mean, which can itself be determined from an overall mass balance.
To validate the model, a spouted bed coating process was studied in which coarse PVC spheres were coated with the hot-melt coating material polyethylene glycol (PEG) 1500. Coating mass distributions, derived from the weight data of individual particles before and after manual coating removal, compared (for the studied conditions) very well with the predictions of the model.
|Item Type:||Journal Article|
|Subjects:||Q Science > QA Mathematics
T Technology > TP Chemical technology
|Divisions:||Faculty of Science > Engineering|
|Library of Congress Subject Headings (LCSH):||Linear models (Statistics), Spouted bed processes, Coating processes|
|Journal or Publication Title:||Canadian Journal of Chemical Engineering|
|Publisher:||Wiley-Blackwell Publishing, Inc.|
|Official Date:||June 2008|
|Number of Pages:||11|
|Page Range:||pp. 571-581|
|Access rights to Published version:||Restricted or Subscription Access|
|Funder:||Biotechnology and Biological Sciences Research Council (Great Britain) (BBSRC), Erasmus Mundus (Program)|
Benkrid, A. and H. S. Caram, “Solid Flow in the Annular Region
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