Transient regime to fluidized chimney within a granular bed by means of a 2D DEM/LBM modelling

Régime transitoire de fluidisation en cheminée dans un milieu granulaire par modélisation 2D DEM-LBM

Ngoma, J. ; Philippe, P. ; Bonelli, S. ; Cuéllar, P. ; Delenne, J.Y. ; Radjaï, F.

Type de document
Communication technique avec actes
Langue
Anglais
Affiliation de l'auteur
IRSTEA AIX EN PROVENCE UR OHAX FRA ; IRSTEA AIX EN PROVENCE UR OHAX FRA ; IRSTEA AIX EN PROVENCE UR OHAX FRA ; IRSTEA AIX EN PROVENCE UR OHAX FRA ; UMR IATE INRA CIRAD MONTPELLIER FRA ; LABORATOIRE DE MECANIQUE ET GENIE CIVIL CNRS UNIVERSITE MONTPELLIER 2 FRA
Année
2015
Résumé / Abstract
Beyond a given threshold, an upward fluid flow at constant flowrate, injected through a small size section, is able to generate a fluidization along a vertical chimney over the entire height of a granular assembly. Fluidization is first initiated in the immediate vicinity of the injection hole and then the fluidized zone grows gradually until reaching the upper surface of the granular packing. In this work, we present numerical results on the kinetics of chimney fluidization in an immersed granular bed produced with two-dimensional simulations coupling the Discrete Element and Lattice Boltzmann Methods (DEM-LBM). A parametric study is carried out with 11 different sets of physical parameters and analysed based on spatio-temporal diagrams. Then a dimensional analysis allows finding general scaling laws for both threshold and growth rate of the fluidized zone by use of two dimensionless numbers, namely Reynolds and Archimedes numbers, while quite simple empirical relationships can also be proposed.
Congrès
IV International Conference on Particle-based Methods – Fundamentals and Applications - PARTICLES 2015, 28/09/2015 - 30/09/2015, Barcelona, ESP
Document d'origine
IV International Conference on Particle-based Methods – Fundamentals and Applications PARTICLES 2015 ; E. Oñate, M. Bischoff, D.R.J. Owen, P. Wriggers & T. Zohdi (Eds)
Editeur
International Center for Numerical Methods in Engineering (CIMNE)

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