Does Gravity Cause Load-Bearing Bridges in Colloidal and Granular Systems?

Jenkins, Matthew C.; Haw, Mark; Barker, G. C.; Poon, Wilson; Egelhaaf, Stefan U.

doi:10.1103/physrevlett.107.038302

Cited by 16 publications

(16 citation statements)

References 28 publications

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“…For this reason, it is difficult to reason beyond simple speculation. Jenkins et al 31 ran experiments, which showed that at moderate Péclet numbers, the mean cluster size was about 5 particles and the maximum observed size was 70 particles. For non-buoyant non-Brownian particle suspensions, Bonnoit et al 32 showed that there was a critical flow depth…”

Section: -15mentioning

confidence: 99%

Granular suspension avalanches. II. Plastic regime

2013

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We present flume experiments showing plastic behavior for perfectly density-matched suspensions of non-Brownian particles within a Newtonian fluid. In contrast with most earlier experimental investigations (carried out using coaxial cylinder rheometers), we obtained our rheological information by studying thin films of suspension flowing down an inclined flume. Using particles with the same refractive index as the interstitial fluid made it possible to measure the velocity field far from the wall using a laser-optical system. At long times, a stick-slip regime occurred as soon as the fluid pressure dropped sufficiently for the particle pressure to become compressive. Our explanation was that the drop in fluid pressure combined with the surface tension caused the flow to come to rest by significantly increasing flow resistance. However, the reason why the fluid pressure diffused through the pores during the stick phases escaped our understanding of suspension rheology. C 2013 American Institute of Physics. [http://dx

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Section: -15mentioning

confidence: 99%

Granular suspension avalanches. II. Plastic regime

2013

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“…To identify those arches we consider the same protocol used in previous studies [24,25,32]. The method was formulated with a goal of being consistent with previous definitions of arches [1][2][3][4][5][6][7][8] where it is stated that the beads that effectively belong to an arch are those that are mutually stabilized. In other words, particles belonging to an arch are those that would collapse if any other bead in the arch is removed.…”

Section: Spatial Morphology Of Clogging Archesmentioning

confidence: 99%

“…On one hand, several groups have explored the nature of arches within the bulk of granular media [1][2][3][4][5][6][7] or colloidal samples [7,8]. This course has led to useful analogies between the properties of arches and those of the force chains.…”

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confidence: 99%

Force analysis of clogging arches in a silo

et al. 2013

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In this work, we examine a quasi-2D silo that clogs due to the spontaneous formation of stable arches. We validate a numerical scheme comparing the morphology of clogging arches with previous experimental findings. Additionally, we inspect the forces that act on particles, both on those in the bulk of the silo as well as those belonging to the arches formed above the outlet. In the silo, we have found that normal forces are higher close to the wall, in contrast to the central part of the silo, where normal forces are notably lower. Besides, it is revealed that normal forces on particles belonging to the clogging arches are significantly larger than in their surroundings. In a particle of the arch, the magnitude of the force strongly depends on the angle subtended from its center to the contact points with its two neighbors in the arch. Indeed, for angles exceeding 180 • , the larger the angle, the lower the normal force and the higher the tangential one. On the contrary, for smaller angles the behavior is reversed, so the normal forces increase with the angle. Finally, we present a comparison of the normal and tangential force distributions for the particles within the arch and in the bulk. All this shows the special nature of the forces developed in clogging arches, which suggests that direct extrapolations of bulk properties should not be taken for granted.

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“…Arches, defined as arrangements of mutually stabilizing sets of particles capable of withstanding external loads [1,2], are the key ingredient for attaining a solidlike structure. The likeness of this can happen, for instance, in traffic jams [3,4], avalanches of crowds in panic [5], and colloidal systems [6]. The notion that a common description can be given for all those various systems was put forward by Cates et al [7], who called them fragile matter.…”

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confidence: 99%

Breaking Arches with Vibrations: The Role of Defects

et al. 2012

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We present experimental and numerical results regarding the stability of arches against external vibrations. Two-dimensional strings of mutually stabilizing grains are geometrically analyzed and subsequently submitted to a periodic forcing at fixed frequency and increasing amplitude. The main factor that determines the granular arch resistance against vibrations is the maximum angle among those formed between any particle of the arch and its two neighbors: the higher the maximum angle is, the easier it is to break the arch. On the basis of an analysis of the forces, a simple explanation is given for this dependence. From this, interesting information can be extracted about the expected magnitudes of normal forces and friction coefficients of the particles composing the arches.

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Does Gravity Cause Load-Bearing Bridges in Colloidal and Granular Systems?

Cited by 16 publications

References 28 publications

Granular suspension avalanches. II. Plastic regime

Granular suspension avalanches. II. Plastic regime

Force analysis of clogging arches in a silo

Breaking Arches with Vibrations: The Role of Defects

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