The stadium shear device: A novel apparatus for studying dense granular flows

Miller, T.; Rognon, Pierre; Einav, Itai

doi:10.1063/1.4811973

Cited by 4 publications

(5 citation statements)

References 13 publications

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“…Since η is symmetric in i and j, we set in the following i ≤ j. The experimental setup, known as the stadium shear device [3,15], is sketched in Fig. 1(b).…”

mentioning

confidence: 99%

Experimental evidence of detailed balance in granular systems

Sun¹,

Wang²,

Wang³

et al. 2021

Preprint

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We test experimentally a recent surprising prediction that the population out-of-equilibrium dynamics of cell orders in sheared dense planar granular systems converge to steady states that satisfy detailed balance. Not only do we corroborate this prediction in cyclically sheared systems but we also find that detailed balance is satisfied in systems of any density, well beyond the theoretical prediction. We show that the structural statistics in each cycle are uncorrelated and that the convergence to detailed balance on increasing the number of cycles is rapid. This allows us to interpret the cycles as an ensemble of independent systems and so extend our conclusions to systems much larger than our experimental one. The rapid convergence to these states with system size also suggests that this phenomenon can be observed in relatively small systems.

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“…Since η is symmetric in i and j, we set in the following i ≤ j. The experimental setup, known as the stadium shear device [3,15], is sketched in Fig. 1(b).…”

mentioning

confidence: 99%

Experimental evidence of detailed balance in granular systems

Sun¹,

Wang²,

Wang³

et al. 2021

Preprint

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“…2. During steady flow, we find that the spatial mean velocity along the y-axis follows a near-linear profile, as expected from homogeneous simple shear; nevertheless, some deviation was observed from the pure linearity, in an s-shape that we explain in [14] by drawing analogy to eddy viscosity in fluids. Figure 3 shows two snapshots during the steady flow, corresponding to the bottom images of Fig.…”

Section: Nd Motivation -Particle Kinematics In Sheared Granular Mediamentioning

confidence: 77%

“…In this conference these motions are being confirmed for the first time experimentally in homogeneous plane simple-shear [14]. Specifically, this novel apparatus takes a stadium geometry designed to impose shear deformations as large as desired, in 2D granular disk media.…”

Section: Nd Motivation -Particle Kinematics In Sheared Granular Mediamentioning

confidence: 83%

10,000 – A reason to study granular heat convection

Einav¹,

Rognon²,

Gan³

et al. 2013

AIP Conference Proceedings

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Abstract. In sheared granular media, particle motion is characterized by vortex-like structures; here this is demonstrated experimentally for disks system undergoing indefinite deformation during simple shear, as often imposed by the rock masses hosting earthquake fault gouges. In traditional fluids it has been known for years that vortices represent a major factor of heat transfer enhancement via convective internal mixing, but in analyses of heat transfer through earthquake faults and base planes of landslides this has been continuously neglected. Can research proceed by neglecting heat convection by internal mixing? Our answer is astonishingly far from being yes.

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“…We observed the particles within the blue shaded area, shown in Fig. 1(a), which thus mimics simple shear between two infinite parallel boundaries [23]. We applied a cyclic strain, whose maximum varied from 3% to 10%.…”

mentioning

confidence: 87%

“…We show that: (i) entropy dominates in high-friction systems, allowing us to derive the cell order distribution from a maximum entropic argument alone; (ii) structural characteristics of quasi-static dynamic are a result of a competition between mechanical stability and entropy, which the friction tunes; (iii) high-friction systems are liquid-like rather than glassy. The experimental setup, known as the stadium shear device [23], is sketched in Fig. 1(a).…”

mentioning

confidence: 99%

Friction-controlled entropy-stability competition in granular systems

Sun,

Kob,

Blumenfeld

et al. 2020

Preprint

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Using cyclic shear to drive a two dimensional granular system, we determine the structural characteristics for different inter-particle friction coefficients. These characteristics are the result of a competition between mechanical stability and entropy, with the latter's effect increasing with friction. We show that a parameter-free maximum-entropy argument alone predicts an exponential cell order distribution, with excellent agreement with the experimental observation. We show that friction only tunes the mean cell order and, consequently, the exponential decay rate and the packing fraction. We further show that cells, which can be very large in such systems, are short-lived, implying that our system is liquid-like rather than glassy.

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The stadium shear device: A novel apparatus for studying dense granular flows

Cited by 4 publications

References 13 publications

Experimental evidence of detailed balance in granular systems

Experimental evidence of detailed balance in granular systems

10,000 – A reason to study granular heat convection

Friction-controlled entropy-stability competition in granular systems

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