Effect of particle shape on liquid-fluidized beds of binary (and ternary) solids mixtures: segregation vs. mixing
| Autor: | Norman Epstein, R. Escudié, John R. Grace, H.T. Bi |
|---|---|
| Přispěvatelé: | Laboratoire de Biotechnologie de l'Environnement [Narbonne] (LBE), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de la Recherche Agronomique (INRA), Department of Chemical & Biological Engineering, Colorado State University [Fort Collins] (CSU) |
| Rok vydání: | 2006 |
| Předmět: |
020209 energy
General Chemical Engineering Mineralogy Thermodynamics 02 engineering and technology Industrial and Manufacturing Engineering Sphericity HYDRODYNAMICS [CHIM.GENI]Chemical Sciences/Chemical engineering 020401 chemical engineering Settling FLUIDIZATION 0202 electrical engineering electronic engineering information engineering SEGREGATION Fluidization 0204 chemical engineering Shape factor Chemistry Applied Mathematics PARTICLE MIXING GENIE CHIMIQUE General Chemistry Bulk density Fluidized bed HYDRODYNAMIQUE SHAPE SPHERES Ternary operation |
| Zdroj: | Chemical Engineering Science Chemical Engineering Science, Elsevier, 2006, 61 (5), pp.1528-1539. ⟨10.1016/j.ces.2005.08.028⟩ |
| ISSN: | 0009-2509 |
| DOI: | 10.1016/j.ces.2005.08.028 |
| Popis: | Experiments were carried out in water-fluidized binary (and ternary) mixtures of teflon spheres, discs and rods. All particles had the same volume, while the discs and rods had nearly the same sphericity. It is shown that segregation can occur by shape, with similar segregated and mixed zones as when binary mixtures of different size or density are fluidized. The model of Pruden and Epstein (1964; Stratification by size in particulate fluidisation and in hindered settling. Chemical Engineering Science 19, 696), in which the degree of segregation depends on the bulk density difference(s) of the corresponding monocomponent beds at the same liquid velocity, is vindicated qualitatively for each system, but sphericity is not sufficient as a single shape factor to yield a single quantitative correlation of the transitions between segregation patterns for the different systems. Segregation by shape of non-isometric particles appears to require higher reduced density differences than sizing of spheres, probably because of the greater bed instabilities generated by the non-isometric particles. Overall bed voidage is predicted well by the serial model of Epstein et al. (1981; Liquid fluidisation of binary particle mixture– I.Overall bed expansion. Chemical Engineering Science 36, 1803). |
| Databáze: | OpenAIRE |
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