Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session M37: Suspensions: Rheology
8:00 AM–10:10 AM,
Tuesday, November 20, 2018
Georgia World Congress Center
Room: B409
Chair: Harishankar Manikantan, UCSB
Abstract ID: BAPS.2018.DFD.M37.5
Abstract: M37.00005 : Universal scaling law in frictional non-Brownian suspensions
8:52 AM–9:05 AM
Presenter:
Frédéric Blanc
(Institut de Physique de Nice, Université Côte d'Azur)
Authors:
Frédéric Blanc
(Institut de Physique de Nice, Université Côte d'Azur)
Enzo D'Ambrosio
(Institut de Physique de Nice, Université Côte d'Azur)
Laurent Lobry
(Institut de Physique de Nice, Université Côte d'Azur)
François Peters
(Institut de Physique de Nice, Université Côte d'Azur)
Elisabeth Lemaire
(Institut de Physique de Nice, Université Côte d'Azur, CNRS)
We compare the rheology of two kinds of non-Brownian suspensions. One is made of spherical monodisperse polystyrene particles (diameter 80 μm) and the other is made of faceted sugar particles (100μm), both suspended in a Newtonian silicon oil. We perform shear reversal experiments on both suspensions for several particle volume fractions, Φ, and several shear stresses, τ. The two suspensions behave in a quite different fashion. For the faceted particle suspensions (FPS), a large shear-thinning is observed while it is much more moderate for the spherical polystyrene particle suspensions (SPS). Another striking difference lies in the value of the jamming packing fraction, Φm that is much lower for FPS than for SPS. Despite these differences, we will show that shear reversal experiments make it possible to obtain a universal scaling that holds for both FPS and SPS. In this scaling, the difference between the steady viscosity and the viscosity at the minimum that follows the shear reversal, normalized by the steady viscosity is shown to depend only on the ratio Φ/Φm(τ). The collapse of all the data suggests that concentrated non-Brownian suspensions behave in a universal way regardless of the mechanisms responsible for flow-hindering (rotation frustration or sliding friction).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.M37.5
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