Segregation in quasi-two-dimensional granular systems

Rivas, Nicolas; Cordero, Patricio; Risso, Dino; Soto, Rodrigo

doi:10.1088/1367-2630/13/5/055018

Cited by 25 publications

(34 citation statements)

References 31 publications

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“…Grain-grain and grain-wall collisions are dissipative and, therefore, the system can achieve nonequilibrium steady states with a finite average kinetic energy. In these fluid states, the vertical and in-plane motion are very different and energy equipartition is not satisfied: the vertical kinetic energy is typically larger than the horizontal one [25,26]. In what follows we will consider only the effect of the top and bottom walls and disregard the effect of the lateral walls.…”

Section: Quasi 2d Fluidized Granular Mattermentioning

confidence: 99%

Dynamics of a first-order transition to an absorbing state

Néel

Rondini²,

Turzillo³

et al. 2014

Phys. Rev. E

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A granular system confined in a quasi two-dimensional box that is vertically vibrated can transit to an absorbing state in which all particles bounce vertically in phase with the box, with no horizontal motion. In principle, this state can be reached for any density lower than the one corresponding to one complete monolayer, which is then the critical density. Below this critical value, the transition to the absorbing state is of first order, with long metastable periods, followed by rapid transitions driven by homogeneous nucleation. Molecular dynamics simulations and experiments show that there is a dramatic increase on the metastable times far below the critical density; in practice, it is impossible to observe spontaneous transitions close to the critical density. This peculiar feature is a consequence of the non-equilibrium nature of this first order transition to the absorbing state. A Ginzburg-Landau model, with multiplicative noise, describes qualitatively the observed phenomena and explains the macroscopic size of the critical nuclei. The nuclei become of small size only close to a second critical point where the active phase becomes unstable via a saddle node bifurcation. It is only close to this second critical point that experiments and simulations can evidence spontaneous transitions to the absorbing state while the metastable times grow dramatically moving away from it.

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Section: Quasi 2d Fluidized Granular Mattermentioning

confidence: 99%

Dynamics of a first-order transition to an absorbing state

Néel

Rondini²,

Turzillo³

et al. 2014

Phys. Rev. E

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“…Under a variety of driving conditions such as shaking, stirring or shearing, the various types of particles typically segregate into different spatial domains. Examples of these dynamics can be found in the supplementary movies in [1,2] (iopscience.iop.org/1367-2630/13/5/055021/media, iopscience.iop.org/1367-2630/13/5/055018/media) and the video abstract of [3] (iopscience. iop.org/1367-2630/14/1/015001), provided by the authors of the papers in this focus issue.…”

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confidence: 99%

“…In this issue, Rivas et al [2] observe the nucleation and growth of domains within a vibrated quasi-twodimensional horizontal layer of simulated particles. Such a system has no gradients within the plane of motion, but denser particles (of the same size) or larger particles (of the same density) segregate to the center of the system.…”

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confidence: 99%

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Focus on granular segregation

Daniels

Schröter

2013

New J. Phys.

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“…An example of such a discovery is that of low frequency oscillations or LFOs in three-dimensional vibrated systems [174], a phenomenon first discovered using hard sphere simulations and later confirmed by experiment [175]. A similar model was also used to discover the phenomenon of sudden chain energy transfer events [176,177] in quasi-two-dimensional systems, evidence of which was latterly observed in experimental, 3D beds [178].…”

Section: Vibrated Systemsmentioning

confidence: 98%

Polydisperse granular flows over inclined channels

Tunuguntla¹

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POLYDISPERSE GRANULAR FLOWS OVER INCLINED CHANNELS DISSERTATIONto obtain the degree of doctor at the University of Twente, on the authority of the rector magnificus, Prof. dr. H. Brinksma, on account of the decision of the graduation committee, to be publicly defended on Friday 9 October 2015 at 16:45 hrs by Deepak Raju Tunuguntla born on the 3rd of November 1986 in Hyderabad, India. Granular materialsEverything seems simpler from a distance. -Gail TsukiyamaMatter exists in a variety of forms, of which granular materials -although simplebehave differently from any of the other standard forms (solid, liquid and gas). For example, a sand castle appears like a solid, which when tumbled upon, crumbles down like an avalanche. On a few occasions, this avalanche takes down the whole castle, whereas sometimes it is confined only to a thin layer on its surface (liquid). In another example, shake up some crushed ice in a cocktail mixer and it behaves like a gas, whereas when trying to pour some salt out of an orifice of a jar, the flow tends to choke and gets clogged at the orifice. Granular material has it all, solid, liquid, gas, plastic flow, glassy, etc. -it can mimic all of these behaviours. Thus exhibiting a prime reason for investing our interest in understanding these simple but, mysterious materials. HistoryOur knowledge of granular matter dates back to an era even before mankind's existence. These materials exist on a range of scales -micron sized to planetary -in a variety of forms, exhibiting multitudes of interesting phenomena. The earliest encounter between man and granular matter happened in the surroundings in which he evolved, i.e. with soil, sand, stones, rocks, etc., but more importantly it was his need for survival that ultimately led to an inevitable bond between humanity and granular matter, existing till today. Historical records indicate that primitive men often settled along the river banks where fresh food was available throughout the year. However, due to climatic changes coupled with migration of primitive tribes, new food gathering methods had to be devised. Man needed to find some way to store the nutrients for periods of time when no fresh food was available. Seeds, such as cereal grains, seemed to be one way to solve 1 1 2 Introduction Figure 1.1: Facsimile of a famous scene from a wall painting on the tomb of Djehutihotep, a pharoah (circa 1932(circa -1842. It illustrates his huge monolithic statue being transported from the quarries. In the front of the statue (near the feet) we see a workman pouring water to lubricate the sand, helping the four rows of workmen, 43 men in each, to haul the sledge smoothy (less friction). The figure is adapted from Dowson [1].the storage problems. Ultimately around 8000 BCE, during neolithic revolution, this seed storage led man towards becoming more agriculturally oriented. Grains were likely among the first cultivated crops. They could be grown relatively easily, farmed in surplus quantities and were suitable for storage in harsh cold winter climat...

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Segregation in quasi-two-dimensional granular systems

Cited by 25 publications

References 31 publications

Dynamics of a first-order transition to an absorbing state

Dynamics of a first-order transition to an absorbing state

Focus on granular segregation

Polydisperse granular flows over inclined channels

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