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

Philippe, P. ; Cuéllar, P. ; Luu, L.H. ; Mena, S. ; Curtis, J.S. ; -

Type de document
Communication scientifique avec actes
Langue
Anglais
Affiliation de l'auteur
IRSTEA AIX EN PROVENCE UR RECOVER FRA ; IRSTEA AIX EN PROVENCE UR RECOVER FRA ; IRSTEA AIX EN PROVENCE UR RECOVER FRA ; DEPARTMENT OF CHEMICAL ENGINEERING UNIVERSITY OF FLORIDA GAINESVILLE USA ; DEPARTMENT OF CHEMICAL ENGINEERING UNIVERSITY OF FLORIDA GAINESVILLE USA ; -
Année
2016
Résumé / Abstract
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.
Congrès
8th International Conference on Scour and Erosion, 12/09/2016 - 15/09/2016, Oxford, GBR
Document d'origine
Scour and Erosion
Editeur
John Harris, Richard Whitehouse & Sarah Moxon

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