Kinematics

Brown, Raymon L.; Richards, Joeseph

doi:10.1016/b978-0-08-006605-9.50010-3

Cited by 26 publications

(35 citation statements)

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“…The scale factor √ 2gR can be justified assuming the existence of a region, above the orifice, below which the grains fall freely under the gravity. This hypothetical region scales with the outlet aperture R and it was early introduced by Hagen [10] and lately developed by Brown & Richards [11] under the name of "free fall arch". Following the original idea of Hagen, the scaled expression (Eq.…”

Section: Volume Fraction and Velocity Profilesmentioning

confidence: 99%

Velocity and density scaling at the outlet of a silo and its role in the expression of the mass flow rate

Maza

Janda

Rubio-Largo

et al. 2013

AIP Conference Proceedings

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Section: Volume Fraction and Velocity Profilesmentioning

confidence: 99%

Velocity and density scaling at the outlet of a silo and its role in the expression of the mass flow rate

Maza

Janda

Rubio-Largo

et al. 2013

AIP Conference Proceedings

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“…In the continuous flow regime, the mass flow rate W is described by the so called Beverloo's law [1,16]…”

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confidence: 99%

“…In a two-dimensional (2D) setup-or similarly in slit shaped apertures-one expects W = Cρ 2D √ g(A − kD) 3/2 [16]. In the jamming regime, the jamming probability is controlled by the ratio A/D of the aperture size to the grain diameter [14,15,[17][18][19][20].…”

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confidence: 99%

Pressure Independence of Granular Flow through an Aperture

et al. 2010

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We experimentally demonstrate that the flow rate of granular material through an aperture is controlled by the exit velocity imposed to the particles and not by the pressure at the base, contrary to what is often assumed in previous works. This result is achieved by studying the discharge process of a dense packing of monosized disks through an orifice. The flow is driven by a conveyor belt. This two-dimensional horizontal setup allows to uncouple pressure and velocity and, therefore, to independently control the velocity at which the disks escape the horizontal silo and the pressure in the vicinity of the aperture. The flow rate is found to be directly proportional to the belt velocity, independent of the amount of disks in the container and, thus, independent of the pressure in the outlet region. In addition, this specific experimental configuration makes it possible to get information on the system dynamics from a single image of the disks that rest on the conveyor belt after the discharge.

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“…The presence of adhesive forces between grains can greatly alter the physical behavior of sandpiles [1,2]. Although the importance of intergrain adhesion has been noted in many fields, ranging from soil science to civil engineering, the understanding of the physical principles governing the link between the macroscopic behavior of sandpiles in which adhesion is present and the microscopic attractive force distribution within the sandpile remains limited.…”

Section: Introductionmentioning

confidence: 99%

Stability of monomer-dimer piles

et al. 2002

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We measure how strong, localized contact adhesion between grains affects the maximum static critical angle, θc, of a dry sand pile. By mixing dimer grains, each consisting of two spheres that have been rigidly bonded together, with simple spherical monomer grains, we create sandpiles that contain strong localized adhesion between a given particle and at most one of its neighbors. We find that tan θc increases from 0.45 to 1.1 and the grain packing fraction, Φ, decreases from 0.58 to 0.52 as we increase the relative number fraction of dimer particles in the pile, ν d , from 0 to 1. We attribute the increase in tan θc(ν d ) to the enhanced stability of dimers on the surface, which reduces the density of monomers that need to be accomodated in the most stable surface traps. A full characterization and geometrical stability analysis of surface traps provides a good quantitative agreement between experiment and theory over a wide range of ν d , without any fitting parameters. 45.70.Cc,61.43.Gt

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Kinematics

Cited by 26 publications

References 0 publications

Velocity and density scaling at the outlet of a silo and its role in the expression of the mass flow rate

Velocity and density scaling at the outlet of a silo and its role in the expression of the mass flow rate

Pressure Independence of Granular Flow through an Aperture

Stability of monomer-dimer piles

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