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Effect of distributor design on the bottom zone hydrodynamics in a fluidized bed dryer using 1-D X-ray densitometry imaging / Michael Wormsbecker in Industrial & engineering chemistry research, Vol. 48 N° 15 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7004–7015 Titre : Effect of distributor design on the bottom zone hydrodynamics in a fluidized bed dryer using 1-D X-ray densitometry imaging Type de document : texte imprimé Auteurs : Michael Wormsbecker, Auteur ; Todd Pugsley, Auteur ; J. Ruud van Ommen, Auteur Année de publication : 2009 Article en page(s) : pp. 7004–7015 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Fluidized-bed  dryer  Porous  plate  distributors  One-dimensional  X-ray  densitometry  imaging Résumé : The hydrodynamics near the base of a 15 cm i.d. fluidized-bed dryer having perforated, punched, and porous plate distributors have been studied using one-dimensional X-ray densitometry imaging. The time-averaged solids concentration profiles of dry pharmaceutical granule and wet granule undergoing drying were compared. The porous plate creates good gas distribution over the bed cross section with dry granule but results in defluidization at the distributor level when the granule is wet. The perforated and punched plates exhibit different solids concentration profiles with dry granule; however, the presence of moisture results in similar hydrodynamics between the plates during drying. Standard deviation analysis of the high-frequency solids concentration data was used to corroborate the results of the time-averaged solids concentration measurements. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900025n [article] Effect of distributor design on the bottom zone hydrodynamics in a fluidized bed dryer using 1-D X-ray densitometry imaging [texte imprimé] / Michael Wormsbecker, Auteur ; Todd Pugsley, Auteur ; J. Ruud van Ommen, Auteur . - 2009 . - pp. 7004–7015. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7004–7015 Mots-clés : Fluidized-bed  dryer  Porous  plate  distributors  One-dimensional  X-ray  densitometry  imaging Résumé : The hydrodynamics near the base of a 15 cm i.d. fluidized-bed dryer having perforated, punched, and porous plate distributors have been studied using one-dimensional X-ray densitometry imaging. The time-averaged solids concentration profiles of dry pharmaceutical granule and wet granule undergoing drying were compared. The porous plate creates good gas distribution over the bed cross section with dry granule but results in defluidization at the distributor level when the granule is wet. The perforated and punched plates exhibit different solids concentration profiles with dry granule; however, the presence of moisture results in similar hydrodynamics between the plates during drying. Standard deviation analysis of the high-frequency solids concentration data was used to corroborate the results of the time-averaged solids concentration measurements. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900025n