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Experimental study of the effect of particle density on mixing behavior in a spout-fluid bed / Baosheng Jin in Industrial & engineering chemistry research, Vol. 48 N° 22 (Novembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 10055–10064 Titre : Experimental study of the effect of particle density on mixing behavior in a spout-fluid bed Type de document : texte imprimé Auteurs : Baosheng Jin, Auteur ; Yong Zhang, Auteur ; Wenqi Zhong, Auteur Année de publication : 2010 Article en page(s) : pp. 10055–10064 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Mixing  behavior  Spout-fluid  bed  Experimental  study Résumé : The particle mixing behavior has been investigated experimentally in a spout-fluid bed. The bed material used is polypropylene particles, and the tracer employed is chosen from silica gel, mung beans, and glass beads. During all experiments, the completely segregated arrangement of particles is adopted as the initial packing condition. The gas velocity varies to cover internal jet, minimum spouting, and fully developed spouting conditions, in order to establish a full mixing map about the effect of particle density. The mixing behavior is analyzed in terms of flow patterns, concentration profile, and mixing index. The results show that the degree and rate of mixing are significantly affected by the particle density, and heavier particles achieve a higher mixing rate but a poorer mixing quality. The mixing map reveals that to reach the same mixing index, the spouting gas velocity needs to increase with the increase of particle density. Besides, provided that the jet gas velocity does not exceed the minimum spouting gas velocity, a segregation phenomenon can always be observed by simply adjusting the ratio of the fluidizing to spouting gas velocity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900689r [article] Experimental study of the effect of particle density on mixing behavior in a spout-fluid bed [texte imprimé] / Baosheng Jin, Auteur ; Yong Zhang, Auteur ; Wenqi Zhong, Auteur . - 2010 . - pp. 10055–10064. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 10055–10064 Mots-clés : Mixing  behavior  Spout-fluid  bed  Experimental  study Résumé : The particle mixing behavior has been investigated experimentally in a spout-fluid bed. The bed material used is polypropylene particles, and the tracer employed is chosen from silica gel, mung beans, and glass beads. During all experiments, the completely segregated arrangement of particles is adopted as the initial packing condition. The gas velocity varies to cover internal jet, minimum spouting, and fully developed spouting conditions, in order to establish a full mixing map about the effect of particle density. The mixing behavior is analyzed in terms of flow patterns, concentration profile, and mixing index. The results show that the degree and rate of mixing are significantly affected by the particle density, and heavier particles achieve a higher mixing rate but a poorer mixing quality. The mixing map reveals that to reach the same mixing index, the spouting gas velocity needs to increase with the increase of particle density. Besides, provided that the jet gas velocity does not exceed the minimum spouting gas velocity, a segregation phenomenon can always be observed by simply adjusting the ratio of the fluidizing to spouting gas velocity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900689r

Mixing and segregation behavior in a spout-fluid bed / Yong Zhang in Industrial & engineering chemistry research, Vol. 51 N° 43 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 14247–14257 Titre : Mixing and segregation behavior in a spout-fluid bed : Effect of particle size Type de document : texte imprimé Auteurs : Yong Zhang, Auteur ; Wenqi Zhong, Auteur ; Baosheng Jin, Auteur Année de publication : 2013 Article en page(s) : pp. 14247–14257 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Fluid  bed Résumé : The mixing and segregation behavior of a binary mixture have been investigated experimentally in a spout-fluid bed. Three types of binary mixtures were used by mixing glass beads with equal density and dissimilar size. The spouting and fluidizing gas flow rate were adjusted to cover a range of flow regimes, typically including internal jet (IJ), jet in fluidized bed with bubbling (JFB), spouting (S) and spout-fluid (SF). The mixing and segregation behavior were analyzed in terms of flow regimes, concentration profile, and mixing index. The results show that in IJ, the particle circulation is combined with the local segregation where smaller particles migrate to the interface between the jet and stagnant region, even into the latter. In S, the distribution of particle depends greatly on the fountain structure. In JFB, the axial segregation takes place where the smaller particles prevail in the upper part of the bed. Segregation becomes more pronounced with increasing the particle size difference. In addition, a mixing/segregation pattern map is constructed. Three regions including mixing region, segregation region, and intermediate region, are identified by the criterion of mixing index. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301005n [article] Mixing and segregation behavior in a spout-fluid bed : Effect of particle size [texte imprimé] / Yong Zhang, Auteur ; Wenqi Zhong, Auteur ; Baosheng Jin, Auteur . - 2013 . - pp. 14247–14257. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 14247–14257 Mots-clés : Fluid  bed Résumé : The mixing and segregation behavior of a binary mixture have been investigated experimentally in a spout-fluid bed. Three types of binary mixtures were used by mixing glass beads with equal density and dissimilar size. The spouting and fluidizing gas flow rate were adjusted to cover a range of flow regimes, typically including internal jet (IJ), jet in fluidized bed with bubbling (JFB), spouting (S) and spout-fluid (SF). The mixing and segregation behavior were analyzed in terms of flow regimes, concentration profile, and mixing index. The results show that in IJ, the particle circulation is combined with the local segregation where smaller particles migrate to the interface between the jet and stagnant region, even into the latter. In S, the distribution of particle depends greatly on the fountain structure. In JFB, the axial segregation takes place where the smaller particles prevail in the upper part of the bed. Segregation becomes more pronounced with increasing the particle size difference. In addition, a mixing/segregation pattern map is constructed. Three regions including mixing region, segregation region, and intermediate region, are identified by the criterion of mixing index. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301005n