Localized fluidization in a granular medium: Parametric study with a physical model of “sand boiling” | Fluidisation localisée d'un milieu granulaire : étude paramétrique avec un modèle physique de "sable bouillonnant"
2016
Philippe, P. | Cuéllar, P. | Luu, L.H. | Mena, S. | Curtis, J.S. | Risques, Ecosystèmes, Vulnérabilité, Environnement, Résilience (RECOVER) ; Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) | Department of Chemical Engineering [Gainesville] (UF|CHE) ; University of Florida [Gainesville] (UF)
[Departement_IRSTEA]Eaux [TR1_IRSTEA]RIVAGE
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Afficher plus [+] Moins [-]anglais. The present study investigates steady-state localized fluidization within a granular bed by means of experiments on a physical model using a direct internal visualization by means of combined optical techniques. The experimental setup allows access to a broad range of control parameters with the purpose of extending previous findings on this specific configuration, in particular regarding the critical flow rate needed to generate a chimney fluidization. A saturation of this critical flow rate with bed height is and can be ex-plained by a purely hydrodynamic effect related to the geometry and the permeability of the bed which rule together the development of the upward fluid flow through the initially static granular bed. A quantitative model based on CFD simulations is successfully developed in good agreement with the experimental findings.
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