Storage and discharge of a granular fluid

Pacheco-Martinez, H. A.; Gerner, Henk Jan van; Ruiz‐Suárez, J. C.

doi:10.1103/physreve.77.021303

Cited by 32 publications

(28 citation statements)

References 19 publications

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“…Our results also demonstrate that this interface should be parabolic instead of circular as it is commonly considered [5,6]. The existence of this hypothetical interface is also in accord with the hypothesissuggested in other works [20][21][22]-that the bulk dynamics does not have an important influence on the rate of discharge. Although this picture can be hardly assumed by visual inspection of the particle displacements, the collapse obtained for the profiles reveals that the dynamics of the grains could be generalized by introducing an adequate theoretical framework.…”

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confidence: 91%

Flow Rate of Particles through Apertures Obtained from Self-Similar Density and Velocity Profiles

2012

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''Beverloo's law'' is considered as the standard expression to estimate the flow rate of particles through apertures. This relation was obtained by simple dimensional analysis and includes empirical parameters whose physical meaning is poorly justified. In this Letter, we study the density and velocity profiles in the flow of particles through an aperture. We find that, for the whole range of apertures studied, both profiles are self-similar. Hence, by means of the functionality obtained for them the mass flow rate is calculated. The comparison of this expression with the Beverloo's one reveals some differences which are crucial to understanding the mechanism that governs the flow of particles through orifices.

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confidence: 91%

Flow Rate of Particles through Apertures Obtained from Self-Similar Density and Velocity Profiles

2012

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“…Notably, the presumed pressure variation induced by the obstacle affects the flow rate very little. This result is in agreement with previous works, where it was proved that the pressure in a silo does not have a significant influence on the flow rate [18,19]. In this paper, we extend the range of previous results by analyzing the effect of the obstacle position for different sizes of both the outlet and the obstacle.…”

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confidence: 92%

Flow and clogging in a silo with an obstacle above the orifice

et al. 2012

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In a recent paper [Zuriguel et al., Phys. Rev. Lett. 107, 278001 (2011)] it has been shown that the presence of an obstacle above the outlet can significatively reduce the clogging probability of granular matter pouring from a silo. The amount of this reduction strongly depends on the obstacle position. In this work, we present new measurements to analyze different outlet sizes, extending foregoing results and revealing that the effect of the obstacle is enhanced as the outlet size is increased. In addition, the effect of the obstacle position on the flow rate properties and in the geometrical features of arches is studied. These results reinforce previous evidence of the pressure reduction induced by the obstacle. In addition, it is shown how the mean avalanche size and the average flow rate are not necessarily linked. On the other hand, a close relationship is suggested between the mean avalanche size and the flow rate fluctuations.

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“…A similar argument, based in a local pressure reduction, has been used in crowd dynamics to introduce a friction parameter which controls the human clogging [27]. Additionally, let us stress that our results also imply that the pressure reduction does not importantly affect the flow rate, as it has been shown in other experiments [28,29].…”

Section: Prl 107 278001 (2011) P H Y S I C a L R E V I E W L E T T Esupporting

confidence: 78%

Silo Clogging Reduction by the Presence of an Obstacle

et al. 2011

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We present experimental results on the effect that inserting an obstacle just above the outlet of a silo has on the clogging process. We find that, if the obstacle position is properly selected, the probability that the granular flow is arrested can be reduced by a factor of 100. This dramatic effect occurs without any remarkable modification of the flow rate or the packing fraction above the outlet, which are discarded as the cause of the change in the clogging probability. Hence, inspired by previous results of pedestrian crowd dynamics, we propose that the physical mechanism behind the clogging reduction is a pressure decrease in the region of arch formation.

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Storage and discharge of a granular fluid

Cited by 32 publications

References 19 publications

Flow Rate of Particles through Apertures Obtained from Self-Similar Density and Velocity Profiles

Flow Rate of Particles through Apertures Obtained from Self-Similar Density and Velocity Profiles

Flow and clogging in a silo with an obstacle above the orifice

Silo Clogging Reduction by the Presence of an Obstacle

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