http://www.cnr.it/ontology/cnr/individuo/prodotto/ID207805

Flow regimes of a fluid driven granular suspension (Articolo in rivista)

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Flow regimes of a fluid driven granular suspension (Articolo in rivista) (literal)

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Romain Bureau 1, Samuel Brand 1, Robin C. Ball 1, Mario Nicodemi 2 (2012)
Flow regimes of a fluid driven granular suspension
in Granular matter (Print)
(literal)

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1. Department of Physics and Complexity Science Centre, University of Warwick, Coventry, UK 2. Dip.to di Scienze Fisiche, Universitá di Napoli \"Federico II\", CNR-SPIN, INFN, Napoli, Italy (literal)

Titolo

Abstract

We discuss molecular dynamics simulations of a granular suspension driven in a channel by an embedding fluid. The flow has three different regimes: it is disordered at small packing fractions, ; above a transition point, TeX , flows becomes ordered in layers, but only in a fraction of samples; at higher TeX , if ordering is avoided, jamming is also encountered. In the disordered flow regime the velocity profile is power law, consistent with an Ostwald-de Waele constitutive relation. In the ordered regime, flow is concentrated in the bulk in a nearly solid plug having a flat velocity profile, with narrow shear regions at the boundaries. Interestingly, velocity fluctuations are approximately linear in the velocity in all regimes. (literal)

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