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Flow regimes of a fluid driven granular suspension

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Bureau, Romain, Brand, Samuel, Ball, Robin and Nicodemi, Mario (2012) Flow regimes of a fluid driven granular suspension. Granular Matter, Vol.14 (No.2). pp. 175-178. doi:10.1007/s10035-011-0295-y ISSN 1434-5021.

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Official URL: http://dx.doi.org/10.1007/s10035-011-0295-y

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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, ϕ ; above a transition point, ϕm , flows becomes ordered in layers, but only in a fraction of samples; at higher ϕ , 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.

Item Type: Journal Article
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title: Granular Matter
Publisher: Springer
ISSN: 1434-5021
Official Date: 2012
Dates:
DateEvent
2012Published
Volume: Vol.14
Number: No.2
Page Range: pp. 175-178
DOI: 10.1007/s10035-011-0295-y
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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