Local determination of the constitutive law of a dense suspension of noncolloidal particles through magnetic resonance imaging

Ovarlez, Guillaume; Bertrand, François; Rodts, Stéphane

doi:10.1122/1.2188528

Cited by 235 publications

(297 citation statements)

References 77 publications

(157 reference statements)

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“…Experimental studies have confirmed that suspension viscosity ⌘ s increases with φ and diverges as φ approaches a maximal fraction φ m about 0.6 (Ovarlez et al 2006). Despite some differences among the various experimental results, the relation between viscosity and particle volume fraction is now reasonably well documented (Stickel & Powell 2005).…”

Section: Introductionmentioning

confidence: 52%

Rheology of sheared suspensions of rough frictional particles

et al. 2014

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This paper presents three-dimensional numerical simulations of non-Brownian concentrated suspensions in a Couette flow at zero Reynolds number using a fictitious domain method. Contacts between particles are modelled using a discrete element method (DEM)-like approach, which allows for a more physical description, including roughness and friction. This work emphasizes the effect of friction between particles and its role on rheological properties, especially on normal stress differences. Friction is shown to notably increase viscosity and second normal stress difference $\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq =\leqslant \let \ge =\geqslant \let \geq =\geqslant \def \Pr {\mathit {Pr}}\def \Fr {\mathit {Fr}}\def \Rey {\mathit {Re}}|N_2|$ and decrease $|N_1|$, in better agreement with experiments. The hydrodynamic and contact contributions to the overall particle stress are particularly investigated. This shows that the effect of friction is mostly due to the additional contact stress since the hydrodynamic stress remains unaffected by friction. Simulation results are also compared with experiments, such as normal stresses or effective friction coefficient $\mu (I_v)$, and the agreement is improved when friction is accounted for. This suggests that friction is operative in actual suspensions.

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Section: Introductionmentioning

confidence: 52%

Rheology of sheared suspensions of rough frictional particles

et al. 2014

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“…week ending 11 JANUARY 2008 0031-9007=08=100(1)=018301 (4) 018301-1 © 2008 The American Physical Society (MRI) rheometer from which we directly get the local velocity distribution in a Couette geometry with a gap of 1.85 cm [14]. We investigated the stationary flows for inner cylinder rotational velocity ranging between 0.2 and 10 rpm, corresponding to overall shear rates between 0.04 and 2:35 s ÿ1 .…”

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confidence: 99%

Shear Thickening of Cornstarch Suspensions as a Reentrant Jamming Transition

Fall

Huang

Bertrand³

et al. 2008

Phys. Rev. Lett.

246

262

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We study the rheology of cornstarch suspensions, a non-Brownian particle system that exhibits shear thickening. From magnetic resonance imaging velocimetry and classical rheology it follows that as a function of the applied stress the suspension is first solid (yield stress), then liquid, and then solid again when it shear thickens. For the onset of thickening we find that the smaller the gap of the shear cell, the lower the shear rate at which thickening occurs. Shear thickening can then be interpreted as the consequence of dilatancy: the system under flow wants to dilate but instead undergoes a jamming transition because it is confined, as confirmed by measurement of the dilation of the suspension as a function of the shear rate.

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“…In most cases, these data have been obtained from macroscopic measurements (e.g., using rheometers), assuming that the bulk behaves as a homogeneous fluid, however there is accumulating evidence that this procedure leads to miscalculations of the bulk behavior. 19,20 The current trend is to infer rheological properties by local measurements. Flow visualization has made it possible to derive the rheological properties directly by measuring the local velocity and particle concentrations.…”

Section: Introductionmentioning

confidence: 99%

Granular suspension avalanches. I. Macro-viscous behavior

2013

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We experimentally studied the flow behavior of a fixed volume of granular suspension, initially contained in a reservoir and released down an inclined flume. Here "granular suspension" refers to a suspension of non-Brownian particles in a viscous fluid. Depending on the solids fraction, density mismatch, and particle size distribution, a wealth of behaviors can be observed. Here we report and interpret results obtained with granular suspensions, which consisted of neutrally buoyant particles with a solids fraction (φ = 0.575-0.595) close to the maximum random packing fraction (estimated at φ m = 0.625). The particles had the same refractive index as the fluid, which made it possible to measure the velocity profiles inside the moving bulk and far from the sidewalls. Additional information such as the front position and the flow depth was also recorded. Three regimes were observed. At early times, the flow features were reminiscent of homogeneous Newtonian fluids (e.g., the same dependence of the front position on time). At later times, the free surface became more and more bumpy as fractures developed within the bulk. This fracture process ultimately gave rise to a stick-slip regime, in which the suspension moved intermittently. In this paper, we focus on the first regime referred to as the macroviscous regime. Although the bulk flow properties looked like those of Newtonian fluids, the internal dynamics were much richer. C 2013 American Institute of Physics.

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Local determination of the constitutive law of a dense suspension of noncolloidal particles through magnetic resonance imaging

Cited by 235 publications

References 77 publications

Rheology of sheared suspensions of rough frictional particles

Rheology of sheared suspensions of rough frictional particles

Shear Thickening of Cornstarch Suspensions as a Reentrant Jamming Transition

Granular suspension avalanches. I. Macro-viscous behavior

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