Rheology of sedimenting particle pastes

Fall, Abdoulaye; Cagny, Henri de; Bonn, Daniel; Ovarlez, Guillaume; Wandersman, Élie; Dijksman, Joshua A.; Hecke, Martin van

doi:10.1122/1.4809732

Cited by 12 publications

(17 citation statements)

References 40 publications

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“…4b and 4c, respectively. The corresponding values of µ 0 ~ 0.5 and η eff ~ 10 4 are consistent with those found in literature 8,9,27 . Similarly to previous studies [18][19][20][21][22][23][24][25][26][27][28] , we consider the effect of horizontal vibration as a controlled perturbation, or effective temperature, that modifies the mechanical properties of granular media such as yield stress and effective viscosity.…”

Section: Discussionsupporting

confidence: 91%

Ultrasonic tracking of a sinking ball in a vibrated dense granular suspension

Wildenberg

Jia

Léopoldès

et al. 2019

Sci Rep

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Observing and understanding the motion of an intruder through opaque dense suspensions such as quicksand remains a practical and conceptual challenge. Here we use an ultrasonic probe to monitor the sinking dynamics of a steel ball in a dense glass bead packing (3D) saturated by water. We show that the frictional model developed for dry granular media can be used to describe the ball motion induced by horizontal vibration. From this rheology, we infer the static friction coefficient and effective viscosity that decrease when increasing the vibration intensity. Our main finding is that the vibration-induced reduction of the yield stress and increase of the sinking depth are presumably due to micro-slips induced at the grain contacts but without visible plastic deformation due to macroscopic rearrangements, in contrast to dry granular packings. To explain these results, we propose a mechanism of acoustic lubrication that reduces the inter-particle friction and leads to a decrease of the yield stress. This scenario is different from the mechanism of liquefaction usually invoked in loosely packed quicksands where the vibration-induced compaction increases the pore pressure and decreases the confining pressure on the solid skeleton, thus reducing the granular resistance to external load.

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Section: Discussionsupporting

confidence: 91%

Ultrasonic tracking of a sinking ball in a vibrated dense granular suspension

Wildenberg

Jia

Léopoldès

et al. 2019

Sci Rep

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“…Dispersions of non-Brownian particles in Newtonian fluids (i.e., granular suspensions) display a wide array of rheological behaviors: yield stress [17][18][19][20], shear banding [17,19,21], shear thickening [22,23], and normal stress dilation [24][25][26], to name a few. Most important to the work presented here is the phenomenon known as resuspenion; the process in which an initially settled layer of negatively buoyant particles are remobilized and convected into the surrounding bulk fluid.…”

Section: Introductionmentioning

confidence: 99%

Mixing behavior of a model cellulosic biomass slurry during settling and resuspension

Crawford

Sprague

Stickel

2016

Chemical Engineering Science

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Thorough mixing during biochemical deconstruction of biomass is crucial for achieving maximum process yields and economic success. However, due to the complex morphology and surface chemistry of biomass particles, biomass mixing is challenging and currently, it is not well understood. This study investigates the bulk rheology of negatively buoyant, non-Brownian α-cellulose particles during settling and resuspension. The torque signal of a vane mixer across two distinct experimental setups (vane-in-cup and vane-in-beaker) was used to understand how mixing conditions affect the distribution of biomass particles. During experimentation, a bifurcated torque response as a function of vane speed was observed, indicating that the slurry transitions from a "settling-dominant" regime to a "suspension-dominant" regime. The torque response of well-characterized fluids (i.e., DI water) were then used to empirically identify when sufficient mixing turbulence was established in each experimental setup. The predicted critical mixing speeds were in agreement with measured values, suggesting that secondary flows are required in order to keep the cellulose particles fully suspended. In addition, a simple scaling relationship was developed to model the entire torque signal of the slurry throughout settling and resuspension. Qualitative and semi-quantitative agreement between the model and experimental results was observed.

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“…The instantaneous settling velocity v or acceleration a is obtained by numerically differentiating z or v over a time interval. These experimental results are then analyzed with the granular rheology law µ(I) revealed in dry packings [3], being extended to dense granular suspensions [4][5][6][7]. We find that external shaking primarily affects the yield stress [8][9][10] and consequently controls the depth of sinking.…”

Section: Introductionmentioning

confidence: 93%

“…The Reynolds number Re = F i /F v ~ 10 -4 is very small and also the Stokes number St = U p d 2 K f (dJ/dt) i 1 with the density of glass grains U p = 2500 kg/m 3 and the strain rate dJ/dt ~ (dz/dt)/R, indicating that viscous forces dominate at the particle scale and the internal time is given by a viscous scaling. In this case, the constitutive equation for the frictional rheology can be written as [4,6,7]:…”

Section: Frictional Rheologymentioning

confidence: 99%

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Acoustic monitoring of a ball sinking in vibrated granular sediments

et al. 2017

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We develop an ultrasound probing to investigate the dynamics of a high density ball sinking in 3D opaque dense granular suspensions under horizontal weak vibrations. We show that the motion of the ball in these horizontally vibrated glass bead packings saturated by water is consistent with the frictional rheology. The extracted stress-strain relation evidences an evolution of flow behaviour from frictional creep to inertial regimes. Our main finding is that weak external vibration primarily affects the yield stress and controls the depth of sinking via vibration-induced sliding at the grain contact. Also, we observe that the extracted rheological parameters depend on the size of the probing ball, suggesting thus a non-local rheology.

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Rheology of sedimenting particle pastes

Cited by 12 publications

References 40 publications

Ultrasonic tracking of a sinking ball in a vibrated dense granular suspension

Ultrasonic tracking of a sinking ball in a vibrated dense granular suspension

Mixing behavior of a model cellulosic biomass slurry during settling and resuspension

Acoustic monitoring of a ball sinking in vibrated granular sediments

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