Granular dynamics in a swirled annulus

Scherer, Michael; Mahr, Thomas; Engel, A.; Rehberg, Ingo

doi:10.1103/physreve.58.6061

Cited by 11 publications

(6 citation statements)

References 18 publications

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“…The toroidal motion observed for the circular pan has not been observed in rectangular geometries. An inward spiraling motion has been observed for granular media underneath rotating fluids [10] and the radial segregation of granular mixtures has been observed in rotating cylinders [11]. For vertically excited rectangular beds, stationary convection cells, similar to Rayleigh-Benard instabilities, are observed [12,13].…”

Section: B Toroidal Motionmentioning

confidence: 93%

“…Initial studies have also demonstrated that these modes may display complex behavior. For example, Scherer et al [10] have reported that when spheres are placed in a cylindrical pan and are subjected to horizontal shaking, they circulate in one direction at low packing densities, and in the other at high packing densities or high excitation frequencies. rigid, circular, stainless steel pan of radius R = 0.381 m with a flat bottom.…”

Section: Introductionmentioning

confidence: 99%

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Bulk motion of granular matter in an agitated cylindrical bed

et al. 2005

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Experimental results are reported for the bulk motion induced in a bed of granular matter contained in a cylindrical pan with a flat bottom subjected to simultaneous vertical and horizontal vibrations. The motion in space of the moving pan is quantified. A number of distinct bulk dynamical modes are observed in which the particle bed adopts different shapes and motions. At the lowest pan excitation frequency omega , the bed forms a "heap," and rotates about the cylinder axis. As omega is increased, a more complex "toroidal" mode appears in which the bed takes the shape of a torus; in this mode, circulation occurs both about the cylinder axis, and also radially, with particles moving from the outer edge of the pan to the center on the top surface of the bed, and back to the outer edge along the pan bottom. At the highest omega , surface modulations ("surface waves" and "sectors") of the toroidal mode occur. The origin of this family of behavior in terms of the pan motion is discussed.

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Section: B Toroidal Motionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Bulk motion of granular matter in an agitated cylindrical bed

et al. 2005

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“…The advantage, on the other hand, is that genuine results of our simple model may be verified for samples different from dusty plasmas. These include strongly interacting charged aerosol grains [26] in a crystalline state, ferromagnetic colloidal particles in an oscillating magnetic field [27] and periodically shaken arrays [28] of neutral granular matter [29]. Therefore our theoretical predictions can in principle be verified in experiments on dusty plasmas as well as ones on granular materials.…”

Section: Discussionmentioning

confidence: 71%

Melting of dusty plasma crystals in oscillating external fields

Hoffmann¹,

Löwen²

2000

J. Phys.: Condens. Matter

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Abstract. The melting transition of a charge-polydisperse dusty plasma crystal under the influence of a time-dependent oscillating field is studied within a simple model. The stochastic dynamics of the dust particles is modelled by a Fokker-Planck description. Using non-equilibrium computer simulations we detect a non-monotonic behaviour of the melting line as a function of the frequency of the external field. This is attributed to a cage resonance effect which is controlled by the intrinsic polydispersity of the sample. The results are qualitatively explained within a cage theory of the polydisperse solid combined with a generalized Lindemann rule of melting.

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“…In order to understand the essence of rotation-reptation transition, the dimensionality of the apparatus was reduced to a quasi-one-dimensional annulus [16]. The swirling annulus experiment indicated that the physics of one dimensional collisions is sufficient to explain the effect, namely by proposing a 'free path restriction' mechanism.…”

Section: Rotation-reptation Transitionmentioning

confidence: 99%

Snooping in the sand

2010

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Because of the energy dissipation through friction and inelastic collisions between particles, agitated granular matter is generally speaking in a state far from thermal equilibrium. It can be considered as being a complex state of matter, which combines properties of the fluid and of the solid state. In order to provide data for modeling this peculiar state of matter, we investigate the dynamic behavior of granular matter under a two-dimensional vibration in two different experimental setups.

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Granular dynamics in a swirled annulus

Cited by 11 publications

References 18 publications

Bulk motion of granular matter in an agitated cylindrical bed

Bulk motion of granular matter in an agitated cylindrical bed

Melting of dusty plasma crystals in oscillating external fields

Snooping in the sand

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