High-energy velocity tails in uniformly heated granular materials

Chen, Yangrui; Zhang, Jie

doi:10.1103/physreve.106.l052903

Cited by 3 publications

(5 citation statements)

References 52 publications

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“…Here the thermal velocity v T = 1.4 ± 0.1 D ⋅ s −1 is weakly affected by ϕ 52 . Inspired by the theoretical work by Caprini et al 32 , the simplified dynamical equations for non-polar active particles can read: …”

Section: Resultsmentioning

confidence: 93%

“…In the pre-experiment, each individual particle exhibits Brownian-like behavior, characterized by uncoupled translation and rotation with Gaussian distributions centered around zero means, in the absence of particle-particle collisions 52 .…”

Section: Resultsmentioning

confidence: 99%

“…A flat aluminum alloy plate (60 cm × 60 cm × 1 cm) is mounted onto the pedestal by eight strong F-clamps. To prevent particle motion along the boundary, we utilize a flower-shaped acrylic confining boundary 52 . Boundary particles consisting of three layers are excluded from the analysis.…”

Section: Methodsmentioning

confidence: 99%

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Anomalous flocking in nonpolar granular Brownian vibrators

Chen,

Zhang

2024

Nat Commun

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Using Brownian vibrators, we investigated the structures and dynamics of quasi-2d granular materials, with packing fractions (ϕ) ranging from 0.111 to 0.832. Our observations revealed a remarkable large-scale flocking behavior in hard granular disk systems, encompassing four distinct phases: granular fluid, flocking fluid, poly-crystal, and crystal. Anomalous flocking emerges at ϕ = 0.317, coinciding with a peak in local density fluctuations, and ceased at ϕ = 0.713 as the system transitioned into a poly-crystal state. The poly-crystal and crystal phases resembled equilibrium hard disks, while the granular and flocking fluids differed significantly from equilibrium systems and previous experiments involving uniformly driven spheres. This disparity suggests that collective motion arises from a competition controlled by volume fraction, involving an active force and an effective attractive interaction resulting from inelastic particle collisions. Remarkably, these findings align with recent theoretical research on the flocking motion of spherical active particles without alignment mechanisms.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

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Anomalous flocking in nonpolar granular Brownian vibrators

Chen,

Zhang

2024

Nat Commun

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“…Our experimental setup mainly consists of a horizontal confined layer of quasi-2d monodisperse Brownian vibrators placed on top of an aluminum plate driven vertically along the z-axis by an electromagnetic shaker. A flower-shaped boundary confines particles and prevents creep particle motion along the boundary [51]. We discard particles within three layers next to the boundary to reduce boundary effects.…”

mentioning

confidence: 99%

“…1(a-c), corresponding to the cluster fluid (a), collective fluid (b), and poly-crystal (c). An individual particle is Brownian-like with uncorrelated translation and rotation with Gaussian distributions of zero means [51]. A Brownian vibrator is disk-shaped with 12 alternately inclined supporting legs, as shown in Fig.…”

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confidence: 99%

Clusters and collective motions in Brownian vibrators

Chen¹,

Zhang²

2023

Preprint

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Using Brownian vibrators, where single particles can undergo Brownian motion under vibration, we experimentally investigated self-organized structures and dynamics of quasi-two-dimensional (quasi-2d) granular materials with volume fractions 0.111 ≤ φ ≤ 0.832. We show rich structures and dynamics in hard-disk systems of inelastic particle collisions, with four phases corresponding to cluster fluid, collective fluid, poly-crystal, and crystal. While poly-crystal and crystal are strikingly similar to the equilibrium hard disks, the first two phases differ substantially from the equilibrium ones and the previous quasi-2d experiments of uniformly driven spheres. Our investigation provides single-particle-scale evidence that granular materials subject to uniform random forcing are weakly cohesive with complex internal structures and dynamics. Moreover, our experiment shows that large-scale collective motion can arise in a purely repulsive hard-disk system. The collective motion emerges near φ = 0.317, where the most significant clusters span half of the system, and disappears near φ = 0.713, around which the system crystallizes and the melting transition occurs in the equilibrium hard disks.

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Translational and rotational non-Gaussianities in homogeneous freely evolving granular gases

Megías

Santos

2023

Phys. Rev. E

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High-energy velocity tails in uniformly heated granular materials

Cited by 3 publications

References 52 publications

Anomalous flocking in nonpolar granular Brownian vibrators

Anomalous flocking in nonpolar granular Brownian vibrators

Clusters and collective motions in Brownian vibrators

Translational and rotational non-Gaussianities in homogeneous freely evolving granular gases

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