Bulk and local rheology in a dense and vibrated granular suspension

Gaudel, Naïma; Richter, Sébastien Kiesgen de; Louvet, Nicolas; Jenny, Mathieu; Skali-Lami, Salaheddine

doi:10.1103/physreve.96.062905

Cited by 15 publications

(17 citation statements)

References 42 publications

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“…and neglecting the slight variation of η eff in the low shear rate 27 , we may derive the analytical solution of equation of motion (1) using the initial conditions (see Methods for details). In the quasi-steady regime d 2 z/dt 2 → 0, the corresponding solution with the initial condition z = z* at t = t* can be written as…”

Section: Discussionmentioning

confidence: 99%

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: Discussionmentioning

confidence: 99%

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

Wildenberg

Jia

Léopoldès

et al. 2019

Sci Rep

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“…Pre-vibration has been applied at 70 Hz during 10 min for removing any packing history before each measurement. The volume fraction of glass beads is ϕ glass ≈ 0.61 [21,45] (ρ glass = 2500 kg/m 3 ). All tests have been carried out at imposed shear stress with the range of 4.5-188 Pa and the measured shear rate ranged as 3×10 −5 − 10 s −1 .…”

Section: Discovery Hr3-rheometermentioning

confidence: 99%

“…In addition, this method is convenient to control the different steps of industrial process consisting of feeding, conveying and even parts of the equipment such as hopper, etc. [20,21]. The mentioned technique has been studied recently by implementing a rheometer attached to a shaker [21].…”

Section: Introductionmentioning

confidence: 99%

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Powder flow behavior governed by the surface properties of glass beads

et al. 2021

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Powder rheology and its sensitivity to surrounding environmental condition by controlling the surface properties of the particles is one of the major challenges of the powder industries. Indeed, handling large quantities needs powders with good flowability, adequate compressibility and few electrostatic charges. We have performed a chemical treatment in order to obtain hydrophobic glass beads and its bulk behavior has been compared with raw glass beads depending on the humidity. We characterized flow properties under different processing equipments. We observed that by performing hydrophobic surface treatment sensitivity of glass beads reduced to the humidity. Furthermore, the influence of the electrostatic charges was an undeniable factor in increasing the viscosity of hydrophobic glass beads and consequently lowering its flowability in front of raw glass beads; at low shear rate. At high shear rate, the powders presented similar behaviors.

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“…To avoid these arches, a solution is to apply mechanical vibrations to the silo [9,10]. Indeed, vibrations can suppress the yield stress and change the rheology of granular flows [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Discharge of a granular silo under mechanical vibrations

2021

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In this paper, we study the flow rate of model granular material in a silo under the influence of mechanical vibrations. Experimental measurements and discrete element simulations (DEM) are performed in a quasi-2D silo. The influence on the flow rate of the opening size and the vibration applied on the entire silo is studied. Two distinct regimes are evidenced, governed by the Froude number Fr and the relative frequency Ω. In the first regime, a decreased flow rate is observed when increasing the vibration intensity. This behavior is explained by the presence of reorganizations induced by the vibration, leading to a more homogeneous but also slower flow. In the second regime, an increased flow rate is evidenced when increasing the vibration intensity. We find this behavior comes from the intermittent nature of the flow, where the flow rate is directly controlled by the propagation of shock waves all along the silo.

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Bulk and local rheology in a dense and vibrated granular suspension

Cited by 15 publications

References 42 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

Powder flow behavior governed by the surface properties of glass beads

Discharge of a granular silo under mechanical vibrations

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