Convective roll patterns in vertically vibrated beds of granules

Aoki, Keiko M.; Akiyama, Tetsuo; Maki, Yoji; Watanabe, Tatsuyuki

doi:10.1103/physreve.54.874

Cited by 112 publications

(55 citation statements)

References 21 publications

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“…Note that Ref. [7] had reported a result showing that the number of convection rolls in the rectangular containers increases with vibration acceleration, apparently opposite to our results. They operated their system at large accelerations (>6g) and generated the reversed convection rolls where particles went down in the middle and rose up along the side walls.…”

Section: E Effect Of Surface Heightcontrasting

confidence: 57%

Pseudo 2-Dimensional Trajectory of a Particle in Vibrating Granular Bed

Chaiworn¹,

Chung²,

Liaw³

2014

IJAPM

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 Abstract-We experimentally study how the convection patterns of the pseudo two-dimensional granular systems under vibration are affected by the friction between the granules and the side walls of the container. We show that the number of convection cells and the direction of granule velocity are strongly dependent on the magnitudes of the friction. These are adjusted in our experiments by changing the surface property of the container walls, wall motion, and granular height. The larger the friction between the granules and the side wall, the larger the convection cell it generates, and consequently the fewer number of cells the system has. The friction-dependent property of the convection cells is unique to granules not shared by fluid.

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Section: E Effect Of Surface Heightcontrasting

confidence: 57%

Pseudo 2-Dimensional Trajectory of a Particle in Vibrating Granular Bed

Chaiworn¹,

Chung²,

Liaw³

2014

IJAPM

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“…Starting from a bouncing bed and increasing the shaking frequency f , three different phenomena are observed: (a) For F 3 layers the bed is vaporized and becomes a granular gas (Section VI), (b) for 3 < F 6 convection rolls form (Section V), and (c) for F > 6 layers the bed develops undulations (also called "arching" or "ripples" in the literature [1,2,3,5,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33]), which we will cover in this section.…”

Section: Undulationsmentioning

confidence: 99%

“…Granular convection has been studied extensively at mild fluidization [23,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69], for which the convection is principally boundary-driven. However, the buoyancy-driven convection observed here occurs at high fluidization and this has been reported much more rarely in the literature.…”

Section: Convection Rollsmentioning

confidence: 99%

Phase diagram of vertically shaken granular matter

et al. 2007

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A shallow, vertically shaken granular bed in a quasi 2-D container is studied experimentally yielding a wider variety of phenomena than in any previous study: (1) bouncing bed, (2) undulations, (3) granular Leidenfrost effect, (4) convection rolls, and (5) granular gas. These phenomena and the transitions between them are characterized by dimensionless control parameters and combined in a full experimental phase diagram.

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“…In the absence of this common base, theoretical and computational efforts in describing these patterns followed several different directions. Aoki et al (1996) were first to perform molecular dynamics simulations of patterns in the vibrated granular layer. They concluded that grain-grain friction is necessary for pattern formation in this system.…”

Section: Simulations Of Vibrated Granular Layersmentioning

confidence: 99%

Patterns and collective behavior in granular media: Theoretical concepts

2006

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Granular materials are ubiquitous in our daily lives. While they have been a subject of intensive engineering research for centuries, in the last decade granular matter attracted significant attention of physicists. Yet despite a major efforts by many groups, the theoretical description of granular systems remains largely a plethora of different, often contradicting concepts and approaches. Authors give an overview of various theoretical models emerged in the physics of granular matter, with the focus on the onset of collective behavior and pattern formation. Their aim is two-fold: to identify general principles common for granular systems and other complex non-equilibrium systems, and to elucidate important distinctions between collective behavior in granular and continuum pattern-forming systems.

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Convective roll patterns in vertically vibrated beds of granules

Cited by 112 publications

References 21 publications

Pseudo 2-Dimensional Trajectory of a Particle in Vibrating Granular Bed

Pseudo 2-Dimensional Trajectory of a Particle in Vibrating Granular Bed

Phase diagram of vertically shaken granular matter

Patterns and collective behavior in granular media: Theoretical concepts

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