Publications des scientifiques de l'IRD

Meruane C., Tamburrino A., Roche Olivier. (2012). Dynamics of dense granular flows of small-and-large-grain mixtures in an ambient fluid. Physical Review E, 86 (2), p. 026311. ISSN 1539-3755.

Titre du document
Dynamics of dense granular flows of small-and-large-grain mixtures in an ambient fluid
Année de publication
2012
Type de document
Article référencé dans le Web of Science WOS:000307750400001
Auteurs
Meruane C., Tamburrino A., Roche Olivier
Source
Physical Review E, 2012, 86 (2), p. 026311 ISSN 1539-3755
Dense grain flows in nature consist of a mixture of solid constituents that are immersed in an ambient fluid. In order to obtain a good representation of these flows, the interaction mechanisms between the different constituents of the mixture should be considered. In this article, we study the dynamics of a dense granular flow composed of a binary mixture of small and large grains immersed in an ambient fluid. In this context, we extend the two-phase approach proposed by Meruane et al. [J. Fluid Mech. 648, 381 ( 2010)] to the case of flowing dense binary mixtures of solid particles, by including in the momentum equations a constitutive relation that describes the interaction mechanisms between the solid constituents in a dense regime. These coupled equations are solved numerically and validated by comparing the numerical results with experimental measurements of the front speed of gravitational granular flows resulting from the collapse, in ambient air or water, of two-dimensional granular columns that consisted of mixtures of small and large spherical particles of equal mass density. Our results suggest that the model equations include the essential features that describe the dynamics of grains flows of binary mixtures in an ambient fluid. In particular, it is shown that segregation of small and large grains can increase the front speed because of the volumetric expansion of the flow. This increase in flow speed is damped by the interaction forces with the ambient fluid, and this behavior is more pronounced in water than in air.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020] ; Géophysique interne [066]
Localisation
Fonds IRD [F B010079619]
Identifiant IRD
PAR00009214
Contact