Analysis of particle segregation and intermixing in solid−liquid fluidized beds / Prakash V Chavan in Industrial & engineering chemistry research, Vol. 47 n°21 (Novembre 2008)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8458–8470 Titre : Analysis of particle segregation and intermixing in solid−liquid fluidized beds Type de document : texte imprimé Auteurs : Prakash V Chavan, Auteur ; Jyeshtharaj B. Joshi, Auteur Année de publication : 2008 Article en page(s) : p. 8458–8470 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Analysis of particl Résumé : Particle segregation and intermixing have been studied in 50 mm i.d. and 1.2 m long solid−liquid fluidized bed (SLFB). An ion-exchange resin was used as a solid phase in five size ranges with average particle sizes (dry basis) of 427, 500, 605, 725, and 855 μm. Expansion characteristics of beds were investigated separately for all the particle sizes. The expansion characteristics were also investigated using 2, 3, 4, and 5 sizes having all the combinations among 427, 500, 605, 725, and 855 μm. In all cases, the concentration profiles of the individual sizes were measured along the bed height. The segregation velocity of dense and light particle was predicted and compared with experimental results for binary mixtures. Criteria have been developed for segregation/intermixing in laminar (Re∞ 500) regimes for binary particle systems. The solid dispersion coefficient has also been evaluated for each particle size present in the mixture of particles of different sizes at given operating conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800504z [article] Analysis of particle segregation and intermixing in solid−liquid fluidized beds [texte imprimé] / Prakash V Chavan, Auteur ; Jyeshtharaj B. Joshi, Auteur . - 2008 . - p. 8458–8470. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8458–8470 Mots-clés : Analysis of particl Résumé : Particle segregation and intermixing have been studied in 50 mm i.d. and 1.2 m long solid−liquid fluidized bed (SLFB). An ion-exchange resin was used as a solid phase in five size ranges with average particle sizes (dry basis) of 427, 500, 605, 725, and 855 μm. Expansion characteristics of beds were investigated separately for all the particle sizes. The expansion characteristics were also investigated using 2, 3, 4, and 5 sizes having all the combinations among 427, 500, 605, 725, and 855 μm. In all cases, the concentration profiles of the individual sizes were measured along the bed height. The segregation velocity of dense and light particle was predicted and compared with experimental results for binary mixtures. Criteria have been developed for segregation/intermixing in laminar (Re∞ 500) regimes for binary particle systems. The solid dispersion coefficient has also been evaluated for each particle size present in the mixture of particles of different sizes at given operating conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800504z

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Solid−liquid circulating multistage fluidized bed / Prakash V Chavan in Industrial & engineering chemistry research, Vol. 48 N° 9 (Mai 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4592–4602 Titre : Solid−liquid circulating multistage fluidized bed : hydrodynamic study Type de document : texte imprimé Auteurs : Prakash V Chavan, Auteur ; Dinesh V Kalaga, Auteur ; Jyeshtharaj B. Joshi, Auteur Année de publication : 2009 Article en page(s) : pp. 4592–4602 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Solid−  liquid circulating multistage fluidized bed Riser column Multistage WaterIon-exchange Résumé : The solid−liquid circulating multistage fluidized bed (SLCMFB) was constructed with the principal components being the riser column and the multistage column. The riser column was made up of 50 mm i.d. and 2 m long glass pipe while the multistage column was made up of seven glass stages of 100 mm i.d. and 100 mm length. The ion-exchange resin was used as solid phase and water as fluidizing medium. The flow characteristics of SLCMFB were investigated for 0.365, 0.605, and 0.725 mm particle sizes (dry basis). The voidage in the riser and multistage column was measured using γ-ray tomography (GRT). In the riser column, the voidage was found to be maximum at the center and minimum near the wall. However, in the multistage column, voidage was found to be uniform over cross section of the column. The solid particle velocity was measured using ultrasonic velocity profiler (UVP) in the riser column. The particle velocity profiles show similar trend as the voidage, confirming the existence of the radial non-uniformity in the riser column. Further, the non-uniformity was analyzed using the drift flux model (DFM) and the effect of particle size and superficial liquid velocity on the non-uniformity was also investigated. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8018627 [article] Solid−liquid circulating multistage fluidized bed : hydrodynamic study [texte imprimé] / Prakash V Chavan, Auteur ; Dinesh V Kalaga, Auteur ; Jyeshtharaj B. Joshi, Auteur . - 2009 . - pp. 4592–4602. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4592–4602 Mots-clés : Solid−  liquid circulating multistage fluidized bed Riser column Multistage WaterIon-exchange Résumé : The solid−liquid circulating multistage fluidized bed (SLCMFB) was constructed with the principal components being the riser column and the multistage column. The riser column was made up of 50 mm i.d. and 2 m long glass pipe while the multistage column was made up of seven glass stages of 100 mm i.d. and 100 mm length. The ion-exchange resin was used as solid phase and water as fluidizing medium. The flow characteristics of SLCMFB were investigated for 0.365, 0.605, and 0.725 mm particle sizes (dry basis). The voidage in the riser and multistage column was measured using γ-ray tomography (GRT). In the riser column, the voidage was found to be maximum at the center and minimum near the wall. However, in the multistage column, voidage was found to be uniform over cross section of the column. The solid particle velocity was measured using ultrasonic velocity profiler (UVP) in the riser column. The particle velocity profiles show similar trend as the voidage, confirming the existence of the radial non-uniformity in the riser column. Further, the non-uniformity was analyzed using the drift flux model (DFM) and the effect of particle size and superficial liquid velocity on the non-uniformity was also investigated. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8018627

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