Dynamic critical phenomena in channel flow of driven particles in random media

Watson, J.S.; Fisher, Daniel S.

doi:10.1103/physrevb.55.14909

Cited by 15 publications

(15 citation statements)

References 31 publications

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“…In particular, extensive studies have been performed on plastic depinning of particle assemblies driven over rough landscapes in systems ranging from colloidal particles moving over disordered substrates [31,32], vortices in type-II superconductors [33], and generalized models of particle motion over quenched disorder [34]. In these systems, the velocity response can be fit to the form…”

Section: Velocity Force Curvesmentioning

confidence: 99%

Fluctuations, jamming, and yielding for a driven probe particle in disordered disk assemblies

Reichhardt

2010

Phys. Rev. E

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Using numerical simulations we examine the velocity fluctuations of a probe particle driven with constant force through a two-dimensional disordered assembly of disks which has a well defined jamming point J at a density of φJ = 0.843. As φ increases toward φJ , the average velocity of the probe particle decreases and the velocity fluctuations show an increasingly intermittent or avalanchelike behavior. When the system is within a few percent of the jamming density, the velocity distributions are exponential, while when the system is less than a percent away from jamming, the velocity distributions have a non-exponential or power law character. The velocity power spectra exhibit a crossover from a Lorentzian form to a 1/f shape near jamming. We extract a correlation length exponent ν which is in good agreement with recent shear simulations. For φ > φJ , there is a critical threshold force Fc that must be applied for the probe particle to move through the sample which increases with increasing φ. The onset of the probe motion above φJ occurs via a local yielding of the particles around the probe particle which we term a local shear banding effect.

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Section: Velocity Force Curvesmentioning

confidence: 99%

Fluctuations, jamming, and yielding for a driven probe particle in disordered disk assemblies

Reichhardt

2010

Phys. Rev. E

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“…The first one explains the flowing channel structures and their mutual interactions, while the second one elucidates the v−f characteristics and the criticality in the depinning. Despite the number of experimental and numerical data a detailed theoretical understanding of plastic motion remains still a challenge [56].…”

Section: Comparison With Other Driven Systemsmentioning

confidence: 99%

Pinning and depinning of a classic quasi-one-dimensional Wigner crystal in the presence of a constriction

Piacente

Peeters

2005

Phys. Rev. B

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We studied the dynamics of a quasi-one-dimensional chain-like system of charged particles at low temperature, interacting through a screened Coulomb potential in the presence of a local constriction. The response of the system when an external electric field is applied was investigated. We performed Langevin molecular dynamics simulations for different values of the driving force and for different temperatures. We found that the friction together with the constriction pins the particles up to a critical value of the driving force. The system can depin elastically or quasi-elastically depending on the strength of the constriction. The elastic (quasi-elastic) depinning is characterized by a critical exponent β ∼ 0.66 (β ∼ 0.95). The dc conductivity is zero in the pinned regime, it has non-ohmic characteristics after the activation of the motion and then it is constant. Furthermore, the dependence of the conductivity with temperature and strength of the constriction was investigated in detail. We found interesting differences between the single and the multi-chain regimes as the temperature is increased.

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“…For instance, Refs. [73,74] propose a model in which particles flow in a two dimensional rotated square lattice. When the number of particles present in a site is larger than a threshold, one particle is transferred to a neighboring site.…”

Section: Plastic Depinningmentioning

confidence: 99%

Deblocking of interacting particle assemblies: from pinning to jamming

Miguel¹,

Andrade²,

Zapperi³

2003

Braz. J. Phys.

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A wide variety of interacting particle assemblies driven by an external force are characterized by a transition between a blocked and a moving phase. The origin of this deblocking transition can be traced back to the presence of either external quenched disorder, or of internal constraints. The first case belongs to the realm of the depinning transition, which, for example, is relevant for flux-lines in type II superconductors and other elastic systems moving in a random medium. The second case is usually included within the so-called jamming scenario observed, for instance, in many glassy materials as well as in plastically deforming crystals. Here we review some aspects of the rich phenomenology observed in interacting particle models. In particular, we discuss front depinning, observed when particles are injected inside a random medium from the boundary, elastic and plastic depinning in particle assemblies driven by external forces, and the rheology of systems close to the jamming transition. We emphasize similarities and differences in these phenomena.

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Dynamic critical phenomena in channel flow of driven particles in random media

Cited by 15 publications

References 31 publications

Fluctuations, jamming, and yielding for a driven probe particle in disordered disk assemblies

Fluctuations, jamming, and yielding for a driven probe particle in disordered disk assemblies

Pinning and depinning of a classic quasi-one-dimensional Wigner crystal in the presence of a constriction

Deblocking of interacting particle assemblies: from pinning to jamming

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