Dynamics of an intruder in dense granular fluids

Fiege, Andrea; Grob, Matthias; Zippelius, Annette

doi:10.1007/s10035-011-0309-9

Cited by 27 publications

(34 citation statements)

References 20 publications

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“…In systems with short range interactions such as disks or granular particles [15][16][17][18][19] , the velocity of the probe particle can drop under even a small change in the bulk media density as the jamming transition is approached. For bulk densities below jamming, the external force needed to move the probe particle is small or absent and the probe particle velocity distribution is bimodal 19 .…”

Section: Introductionmentioning

confidence: 99%

“…As the ability to manipulate small particles or groups of small particles has advanced, there have been a growing number of studies examining the effect of local perturbations such as driving a single probe particle through a particle assembly in colloidal [1][2][3][4][5][6][7][8][9][10][11][12][13][14] and granular [15][16][17][18][19] media. The fluctuations and transport characteristics of the probe particle can undergo pronounced changes depending on the ordering of the surrounding media, the particle-particle interactions, the temperature, and the magnitude of the external force on the probe particle.…”

Section: Introductionmentioning

confidence: 99%

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Colloidal lattice shearing and rupturing with a driven line of particles

2013

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We examine the dynamics of two-dimensional colloidal systems using numerical simulations of a system with a drive applied to a thin region in the middle of the sample to produce a local shear. For a monodisperse colloidal assembly, we find a well defined decoupling transition separating a regime of elastic motion from a plastic phase where the particles in the driven region break away or decouple from the particles in the bulk, producing a shear band. For a bidisperse assembly, we find that the onset of a bulk disordering transition coincides with the broadening of the shear band. We identify several distinct dynamical regimes that are correlated with features in the velocity-force curves. As a function of bidispersity, the decoupling force shows a nonmonotonic behavior associated with features in the noise fluctuations, power spectra, and bulk velocity profiles. When pinning is added in the bulk, we find that the shear band regions can become more localized, causing a decoupling of the driven particles from the bulk particles. For a system with thermal noise and no pinning, the shear band region becomes more extended and the average velocity of the driven particles drops at the thermal disordering transition of the bulk system.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Colloidal lattice shearing and rupturing with a driven line of particles

2013

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“…Grain-grain collisions then dissipate further the momentum transferred from the intruder to the bulk. Particle velocimetry measurements also show that due to the two types of collisions mentioned, there is observed circular movement of grains around the intruder thereby filling the wake [2]. Together with the intruder movement, this result in the wake having a non-equilibrium steady state shape of a tear-drop.…”

Section: Resultsmentioning

confidence: 91%

“…Recent studies show that an intruder penetrating a granular medium exhibits both position and velocity fluctuations due to formation and buckling of force chains [1,2,3,4,5]. At constant force mode-using force feedback mechanism, intruder displacements were found to exhibit large fluctuations in the direction of the dragging force.…”

Section: Introductionmentioning

confidence: 99%

Applying fluctuation theorem on position fluctuations of an intruder penetrating a 2D wet granular medium near jamming state

Bonachita

Confesor

2017

AIP Conference Proceedings

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Abstract. We monitor the position of an intruder penetrating a two-dimensional mono-disperse granular assembly near the jamming state. We employ the Fluctuation Theorem (FT) to characterize the fluctuation in the intruder position. The FT takes the form:where Δx τ is the displacement of the intruder after a time interval τ, Π(Δx τ ) is the probability distribution of Δx τ , and F τ is a functional. Our results showed that FT was obeyed for all the intruder driving speeds used in our study and that F τ converges to F at long time scale. Furthermore, a linear dependence of F with the driving speed was measured in agreement to previous experiments.

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“…The complex behavior of granular flows has recently been studied through its interaction with rigid intruders [21][22][23][24][25][26][27][28][29][30][31][32][33]. The high sensitivity of flexible intruders to low forces opens here a promising new way of probing the mechanical behavior of granular media [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Bending transition in the penetration of a flexible intruder in a two-dimensional dense granular medium

et al. 2018

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We study the quasi-static penetration of a flexible beam in a two-dimensional dense granular medium lying on an horizontal plate. Rather than a buckling-like behavior we observe a transition between a regime of crack-like penetration in which the fiber only shows small fluctuations around a stable straight geometry and a bending regime in which the fiber fully bends and advances through series of loading/unloading steps. We show that the shape reconfiguration of the fiber is controlled by a single non dimensional parameter: L/Lc, the ratio of the length of the flexible beam L to Lc, a bending elasto-granular length scale that depends on the rigidity of the fiber and on the departure from the jamming packing fraction of the granular medium. We show moreover that the dynamics of the bending transition in the course of the penetration experiment is gradual and is accompanied by a symmetry breaking of the granular packing fraction in the vicinity of the fiber. Together with the progressive bending of the fiber, a cavity grows downstream of the fiber and the accumulation of grains upstream of the fiber leads to the development of a jammed cluster of grains. We discuss our experimental results in the framework of a simple model of bending-induced compaction and we show that the rate of the bending transition only depends on the control parameter L/Lc.

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Dynamics of an intruder in dense granular fluids

Cited by 27 publications

References 20 publications

Colloidal lattice shearing and rupturing with a driven line of particles

Colloidal lattice shearing and rupturing with a driven line of particles

Applying fluctuation theorem on position fluctuations of an intruder penetrating a 2D wet granular medium near jamming state

Bending transition in the penetration of a flexible intruder in a two-dimensional dense granular medium

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