On cyclic oscillation in granular gas

Miao, Tao

doi:10.1360/982004-612

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…Here we briefly review some experimental results for binary mixtures of grain in a two-compartment system. Miao et al 27) first observed oscillatory phenomena in some preliminary experiments using millet and mung beans, which were different in both sizes and masses. However, they claimed no oscillation for large and small beads made from the same material.…”

Section: Granular Clock: Brief Review Of Experimental Resultsmentioning

confidence: 99%

Granular Gases in Compartmentalized Systems

2009

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Although both granular gases (GG) and molecular gases (MG) are characterized by random motions of their constituents, phenomena not possible for MG, such as clustering and Maxwell's demon are reported in GG. The origin of these intriguing phenomena is the dissipative collisions in GG which are coupled to the local density of the GG in a spatially extended or compartmentalized system. Systems with two or more types of grains are especially interesting because the asymmetry in the dissipative collisions between different types of grains can lead to oscillations and even more interesting dynamics. In this article, flux models with different granular temperatures for different types of grains are studied to understand and explore these phenomena.

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Section: Granular Clock: Brief Review Of Experimental Resultsmentioning

confidence: 99%

Granular Gases in Compartmentalized Systems

2009

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“…In fact, other similar intriguing segregation [11] and ratchet effects [12] have also been reported in compartmentalized granular gases. Granular Maxwell's Demon phenomenon has been studied in simulation [13][14][15][16][17][18][19][20][21][22][23] , theoretical modeling [24][25][26][27][28][29] and by experiment [30][31][32][33][34][35][36][37][38][39][40] in recent years extensively. The segregation phenomenon relies on the existence of a non-monotonic flux, which determines the number of particles per unit time flows between the two compartments [10] .…”

Section: Introductionmentioning

confidence: 99%

DEM simulation of granular segregation in two-compartment system under zero gravity

et al. 2017

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In this paper, granular segregation in a two-compartment cell in zero gravity is studied numerically by DEM simulation. In the simulation using a virtual window method we find a non-monotonic flux, a function which governs the segregation. A parameter  is used to quantify the segregation. The effect of three parameters: the total number of particles N , the excitation strength  , and the position of the window coupling the two compartments, on the segregation  and the waiting time  are investigated. It is found that the segregation observed in zero gravity exists and does not depend on the excitation strength  . The waiting time τ, however, depends strongly on  : Higher the  , lower the waiting time  . The simulation results are important in guiding the SJ-10 satellite microgravity experiments.

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“…Nonequilibrium systems may exhibit self-sustained oscillations, which play important roles in the generation of periodic rhythms in nature, especially in biological systems [1]. A purely physical and macroscopic illustration of such nonequilibrium oscillations is the recently discovered granular clock [2][3][4][5][6][7][8][9], which shows that bidiperse beads can oscillate horizontally between connected compartments under vertical vibrations. The oscillation is facilitated by the vertically heterogeneous species distribution of beads in each compartment and the coupling that naturally allows beads of different species to alternately move between the compartments.…”

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confidence: 99%

Coupled Leidenfrost states as a monodisperse granular clock

Yang

Chen

et al. 2016

Phys. Rev. E

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Using an event-driven molecular dynamics simulation, we show that simple monodisperse granular beads confined in coupled columns may oscillate as a different type of granular clock. To trigger this oscillation, the system needs to be driven against gravity into a density-inverted state, with a high-density clustering phase supported from below by a gaslike low-density phase (Leidenfrost effect) in each column. Our analysis reveals that the density-inverted structure and the relaxation dynamics between the phases can amplify any small asymmetry between the columns, and lead to a giant oscillation. The oscillation occurs only for an intermediate range of the coupling strength, and the corresponding phase diagram can be universally described with a characteristic height of the density-inverted structure. A minimal two-phase model is proposed and a linear stability analysis shows that the triggering mechanism of the oscillation can be explained as a switchable two-parameter Andronov-Hopf bifurcation. Numerical solutions of the model also reproduce similar oscillatory dynamics to the simulation results.

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On cyclic oscillation in granular gas

Cited by 5 publications

References 5 publications

Granular Gases in Compartmentalized Systems

Granular Gases in Compartmentalized Systems

DEM simulation of granular segregation in two-compartment system under zero gravity

Coupled Leidenfrost states as a monodisperse granular clock

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