Annatto powder production in a spouted bed: an experimental and CFD study / Fabiano G. Cunha in Industrial & engineering chemistry research, Vol. 48 N°2 (Janvier 2009)

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p 976–982 Titre : Annatto powder production in a spouted bed: an experimental and CFD study Type de document : texte imprimé Auteurs : Fabiano G. Cunha, Auteur ; Kassia G. Santos, Auteur ; Carlos H. Ataíde, Auteur ; Norman Epstein, Auteur Année de publication : 2009 Article en page(s) : p 976–982 Note générale : chemical engineering Langues : Anglais (eng) Mots-clés : fluid dynamic Résumé : The mechanical extraction of the bixin from Bixa orellana seeds using a spouted bed was investigated in this work. The experimental program was divided into two main steps. In the first step, a two-level factorial experimental design was used to analyze the influence of the main process variables on the mechanical extraction responses. The second step of the experiment was carried out to evaluate the effect of the distance between the draft tube and the conical base (ht). Computational fluid dynamic technique was used to understand seed flow and the effect of ht on the mechanical extraction process. The results obtained showed that the presence of the draft tube was the variable that most strongly affected the powder extraction. The best condition for the bixin extraction from B. orellana seeds was the one when the draft tube was positioned at 4 cm from the air inlet. [article] Annatto powder production in a spouted bed: an experimental and CFD study [texte imprimé] / Fabiano G. Cunha, Auteur ; Kassia G. Santos, Auteur ; Carlos H. Ataíde, Auteur ; Norman Epstein, Auteur . - 2009 . - p 976–982. chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p 976–982 Mots-clés : fluid dynamic Résumé : The mechanical extraction of the bixin from Bixa orellana seeds using a spouted bed was investigated in this work. The experimental program was divided into two main steps. In the first step, a two-level factorial experimental design was used to analyze the influence of the main process variables on the mechanical extraction responses. The second step of the experiment was carried out to evaluate the effect of the distance between the draft tube and the conical base (ht). Computational fluid dynamic technique was used to understand seed flow and the effect of ht on the mechanical extraction process. The results obtained showed that the presence of the draft tube was the variable that most strongly affected the powder extraction. The best condition for the bixin extraction from B. orellana seeds was the one when the draft tube was positioned at 4 cm from the air inlet.

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Experimental and computational fluid dynamics study of dense - phase, transition region, and dilute - phase spouting / Marcos A. S. Barrozo in Industrial & engineering chemistry research, Vol. 49 N° 11 (Juin 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5102–5109 Titre : Experimental and computational fluid dynamics study of dense - phase, transition region, and dilute - phase spouting Type de document : texte imprimé Auteurs : Marcos A. S. Barrozo, Auteur ; Claudio R. Duarte, Auteur ; Norman Epstein, Auteur Année de publication : 2010 Article en page(s) : pp. 5102–5109 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Fluid dynamics Résumé : In this work, the transition between conventional dense-phase spouting and dilute-phase spouting is quantified and characterized on the basis of experimental particle velocity and bed voidage data, obtained with an optical fiber probe, as well as from the evolution of pressure with air velocity. The high gas velocities associated with the dilute-phase spouted bed (DSB) flow regime result in voidages exceeding 0.9 over the entire bed, with no discernible distinction between spout and annulus. The downward particle velocities for the DSB regime differ in magnitude from those in the dense-phase spouting regime. Computational fluid dynamics simulations using the Eulerian granular multiphase model show good agreement with experimental data for the three reproducible flow regimes: dense-phase spouting, transition regime, and dilute-phase spouting. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9004892 [article] Experimental and computational fluid dynamics study of dense - phase, transition region, and dilute - phase spouting [texte imprimé] / Marcos A. S. Barrozo, Auteur ; Claudio R. Duarte, Auteur ; Norman Epstein, Auteur . - 2010 . - pp. 5102–5109. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5102–5109 Mots-clés : Fluid dynamics Résumé : In this work, the transition between conventional dense-phase spouting and dilute-phase spouting is quantified and characterized on the basis of experimental particle velocity and bed voidage data, obtained with an optical fiber probe, as well as from the evolution of pressure with air velocity. The high gas velocities associated with the dilute-phase spouted bed (DSB) flow regime result in voidages exceeding 0.9 over the entire bed, with no discernible distinction between spout and annulus. The downward particle velocities for the DSB regime differ in magnitude from those in the dense-phase spouting regime. Computational fluid dynamics simulations using the Eulerian granular multiphase model show good agreement with experimental data for the three reproducible flow regimes: dense-phase spouting, transition regime, and dilute-phase spouting. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9004892

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Voidage at the layer inversion point in binary-solid liquid-fluidized beds / Renaud Escudié in Industrial & engineering chemistry research, Vol. 48 N°1 (Janvier 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - p. 182-184 Titre : Voidage at the layer inversion point in binary-solid liquid-fluidized beds Type de document : texte imprimé Auteurs : Renaud Escudié, Éditeur scientifique ; Norman Epstein, Éditeur scientifique Année de publication : 2009 Article en page(s) : p. 182-184 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Solid Liquid-Fluidized Layer-inversion phenomenon voidage Résumé : On the basis of three well documented runs on the layer-inversion phenomenon in binary liquid-fluidized beds, it is shown that the best method, to date, for predicting the layer-inversion voidage, knowing the layer inversion velocity, is via the bed contraction equation of Westman (1936), with the adjustable parameter G of that equation as recently modeled. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800246j [article] Voidage at the layer inversion point in binary-solid liquid-fluidized beds [texte imprimé] / Renaud Escudié, Éditeur scientifique ; Norman Epstein, Éditeur scientifique . - 2009 . - p. 182-184. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - p. 182-184 Mots-clés : Solid Liquid-Fluidized Layer-inversion phenomenon voidage Résumé : On the basis of three well documented runs on the layer-inversion phenomenon in binary liquid-fluidized beds, it is shown that the best method, to date, for predicting the layer-inversion voidage, knowing the layer inversion velocity, is via the bed contraction equation of Westman (1936), with the adjustable parameter G of that equation as recently modeled. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800246j

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