Experimental study of granular stratification

Grasselli, Yan; Herrmann, Hans J.

doi:10.1007/pl00010909

Cited by 49 publications

(49 citation statements)

References 11 publications

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“…Many problems in granular matter concern the creation of clusters according to segregation [14], creation of avalanches [15] or decompaction [16]. In this section we present the results of the analysis of the size (mass) of spin and hole clusters in this q-MBD model with or without relaxation processes.…”

Section: The Size (Mass) Distribution Of Clustersmentioning

confidence: 99%

Effects of relaxation processes during deposition of anisotropic grains on a flat substrate

Trojan

Ausloos

2005

Physica A: Statistical Mechanics and its Applications

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The ballistic deposition on a one dimensional substrate of grains with one degree of freedom, called spin, is studied with respect to relaxation processes during deposition. The "spin" represents the grain anisotropy, e.g. its longest axis with respect to the vertical. The grains interact through some contact energy (J) and are allowed to flip with a probability q during deposition and relaxation. Different relaxation processes are investigated. The pile structure is investigated, i.e. the density and "magnetisation", as a function of q and J. A percolation transition is found across which the cluster size changes from exponential-like to a power law-like dependence. The differences between "ferromagnetic" and "anti-ferromagnetic"-like contact energies are emphasized as a function of q.

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Section: The Size (Mass) Distribution Of Clustersmentioning

confidence: 99%

Effects of relaxation processes during deposition of anisotropic grains on a flat substrate

Trojan

Ausloos

2005

Physica A: Statistical Mechanics and its Applications

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“…represent an anisotropic feature, or the position of a grain with respect to neighboring entities, as well as a rotation process, or a dipolar effect, ... Although this is a very crude representation of a grain property, generalizations to more complex nip models are immediately imagined as it has already been done in describing granular segregation [39][40][41][42], decompaction [43], avalanches [44] through "spin-glass" phenomenology [45][46][47][48][49]. There are of course many other reports on how to build a granular pile [50][51][52].…”

Section: Introductionmentioning

confidence: 99%

Exponential and Power Law Distribution of Mass Clusters in a (Magnetic-Like) Deposition Model of Elongated Grains in 2d Piles

Trojan¹,

Ausloos²,

Cloots³

2004

Int. J. Mod. Phys. C

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A generalized so called magnetically controlled ballistic rain-like deposition (MBD) model of granular piles has been numerically investigated in 2D. The grains are taken to be elongated disks whence characterized by a two-state scalar degree of freedom, called "nip", their interaction being described through a Hamiltonian. Results are discussed in order to search for the effect of nip flip (or grain rotation from vertical to horizontal and conversely) probability in building a granular pile. The characteristics of creation of + (or −) nip's clusters and clusters of holes (missing nips) are analyzed. Two different cluster-mass regimes have been identified, through the cluster-mass distribution function which can be exponential or have a power law form depending on whether the nip flip (or grain rotation) probability is large or small. Analytical forms of the exponent are empirically found in terms of the Hamiltonian parameters.

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“…The mixture can also be poured in a two-dimensional silo made up of two vertical plates separated by a gap of approximately 5 mm (a granular Hele-Shaw cell), as studied recently by Makse et al [26][27][28][29]. Different forms of segregation are observed when the grains differ both in their size and their surface properties (shape, roughness, stickiness).…”

Section: Introductionmentioning

confidence: 99%

Surface flows of granular mixtures

1999

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We present the generalization of the minimal model for surface flows of granular mixtures, proposed by de Gennes [J. Phys. I France 6, 1295 (1996)]. The minimal model was valid for grains differing only in their surface properties. The present model also takes into account differences in the size of the grains. We apply the model to study segregation in two-dimensional silos of mixtures of grains differing in size and/or surface properties. When the difference in size is small, the model predicts that a continuous segregation appears in the static phase during the filling of a silo. When the difference in size is wide, we take into account the segregation of the grains in the rolling phase, and the model predicts complete segregation and stratification in agreement with experimental observations.

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Experimental study of granular stratification

Cited by 49 publications

References 11 publications

Effects of relaxation processes during deposition of anisotropic grains on a flat substrate

Effects of relaxation processes during deposition of anisotropic grains on a flat substrate

Exponential and Power Law Distribution of Mass Clusters in a (Magnetic-Like) Deposition Model of Elongated Grains in 2d Piles

Surface flows of granular mixtures

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