Fluidization of a horizontally driven granular monolayer

Heckel, Maria; Sack, Achim; Kollmer, Jonathan E.; Pöschel, Thorsten

doi:10.1103/physreve.91.062213

Cited by 15 publications

(12 citation statements)

References 24 publications

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“…Since the legs of a Vibrot are not independent, de-synchronized motion of the legs corresponds to irregular (waggling) motion of the entire Vibrot. The situation resembles the motion of granular particles in a vibrated container in the absence of gravity [41,42] or in a horizontally vibrated container [43] where a collective synchronous motion of the particles (termed collect and collide mode) is observed for parameters of driving in a certain interval. In this mode, the particles are collectively ejected at the inward stroke of the container wall and then 'collected' at the opposite wall.…”

Section: 1 Modes Of Dynamicsmentioning

confidence: 99%

Ratcheting and tumbling motion of Vibrots

2016

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Systems of granular rotors (Vibrots), that is, small devices that convert linear vibrational motion into rotation by frictional impact, are of scientific interest since they could reveal various types of collective behavior. Looking at an isolated Vibrot, we note at least two different dynamical modes, depending on the parameters of the vibrational driving. By means of finite element simulations, we reveal the driving mechanism for both cases which may be correspondingly identified as ratcheting and tumbling. The transition between both modes resembles period doubling in certain bouncing ball problems leading eventually to chaotic motion in such systems.

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Section: 1 Modes Of Dynamicsmentioning

confidence: 99%

Ratcheting and tumbling motion of Vibrots

2016

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“…[4][5][6][7], and interesting phase-transition phenomena, e.g., Refs. [8,9], just to name a few. To a large degree, these effects are influenced by gravity; therefore, in order to study these systems in the absence of gravity, experiments have been performed in parabolic flights, drop towers, and sounding rockets.…”

Section: Introductionmentioning

confidence: 99%

Absence of Subharmonic Response in Vibrated Granular Systems under Microgravity Conditions

et al. 2015

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By means of experiments in microgravity conditions, we show that granular systems subjected to sinusoidal vibrations respond either by harmonic or gaslike dynamics, depending on the parameters of the vibration, amplitude and frequency, and the container size, while subharmonic response is unstable, except for extreme material properties and particular initial conditions. The absence of subharmonic response in vibrated granular systems implies that granular dampeners cannot reveal higher-order resonances, which makes them even more attractive for technical applications. Extensive molecular dynamics simulations support our findings.

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“…Obviously, when granular material is agitated by an external force, e.g. by a linear vibration, energy is dissipated which is the basic idea of granular dampers which have been investigated recently3940414243444546. Similarly, when a cylinder partially filled by granular material rolls down an inclined plane, the rolling motion is damped due to the motion of the granulate474849, which may be considered as a damper for rotational motion.…”

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confidence: 99%

Dissipation of Energy by Dry Granular Matter in a Rotating Cylinder

Sack¹,

Pöschel²

2016

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We study experimentally the dissipation of energy in a rotating cylinder which is partially filled by granular material. We consider the range of angular velocity corresponding to continous and stationary flow of the granulate. In this regime, the stationary state depends on the angular velocity and on the filling mass. For a wide interval of filling levels we find a universal behavior of the driving torque required to sustain the stationary state as a function of the angular velocity. The result may be of relevance to industrial applications, e.g. to understand the power consumption of ball mills or rotary kilns and also for damping applications where mechanical energy has to be dissipated in a controlled way.

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Fluidization of a horizontally driven granular monolayer

Cited by 15 publications

References 24 publications

Ratcheting and tumbling motion of Vibrots

Ratcheting and tumbling motion of Vibrots

Absence of Subharmonic Response in Vibrated Granular Systems under Microgravity Conditions

Dissipation of Energy by Dry Granular Matter in a Rotating Cylinder

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