Results 221 to 230 of about 7,738 (263)

Modeling Segregation in Granular Flows

Annual Review of Chemical and Biomolecular Engineering, 2019
Accurate continuum models of flow and segregation of dense granular flows are now possible. This is the result of extensive comparisons, over the last several years, of computer simulations of increasing accuracy and scale, experiments, and continuum models, in a variety of flows and for a variety of mixtures.
Paul B, Umbanhowar, Richard M, Lueptow, Julio M, Ottino   +2 more
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Creeping motion in granular flow

Physical Review E, 2005
The core of a quasi-two-dimensional rotating cylinder filled more than half full with glass beads rotates slightly faster than the cylinder itself and decreases in radius over time. Core precession depends linearly on the number of tumbler revolutions while core erosion varies logarithmically.
Benjamin A, Socie, Paul, Umbanhowar, Richard M, Lueptow, Nitin, Jain, Julio M, Ottino   +4 more
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Unsteady Couette granular flows

Physics of Fluids, 1997
Unsteady Couette granular flows are investigated both theoretically and by the means of the discrete element method (DEM). Theoretical formulation of the problem is based on the kinetic theory for smooth, nearly elastic particles. The resulting boundary value problem is solved numerically for two particular types of flows: (a) transient Couette flows ...
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Scales and kinetics of granular flows

Chaos: An Interdisciplinary Journal of Nonlinear Science, 1999
When a granular material experiences strong forcing, as may be the case, e.g., for coal or gravel flowing down a chute or snow (or rocks) avalanching down a mountain slope, the individual grains interact by nearly instantaneous collisions, much like in the classical model of a gas.
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The dynamics of granular flow in an hourglass

Granular Matter, 2001
We present experimental investigations of flow in an hourglass with a slowly narrowing elongated stem. The primary concern is the interaction between grains and air. For large grains the flow is steady. For smaller grains we find a relaxation oscillation (ticking) due to the counterflow of air, as previously reported by Wu et al. [Phys. Rev. Lett.
Veje, Christian, Dimon, Peter
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Shear instabilities in granular flows

Nature, 2002
Unstable waves have been long studied in fluid shear layers. These waves affect transport in the atmosphere and oceans, in addition to slipstream stability behind ships, aeroplanes and heat-transfer devices. Corresponding instabilities in granular flows have not been previously documented, despite the importance of these flows in geophysical and ...
David J, Goldfarb, Benjamin J, Glasser, Troy, Shinbrot   +2 more
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On the stability of rapid granular flows

Journal of Fluid Mechanics, 1993
Numerical simulations of rapid granular flows in large periodic domains have demonstrated the existence of an ‘inelastic microstructure’ characterized by agglomerations of particles into clusters. In the present work the phenomenon of particle clustering is considered to be a manifestation of hydrodynamic instability of the equations governing the ...
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Traffic and Granular Flow ’03

2005
Empirical Traffic Data.- Lane-Change Maneuvers Consuming Freeway Capacity.- Empirical Description of Car-Following.- Optimization Potential of a Highway Network: An Empirical Study.- Observation, Theory and Experiment for Freeway Traffic as Physics of Many-Body System.- Fluctuation in Expressway Traffic Flow.- Calibration and Validation of Microscopic ...
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Shear Flow of a Granular Material

Journal of Statistical Physics, 2001
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Flow pattern of fast granular flow impacting a granular deposit

Powder Technology, 2023
Wangxin Yu, Xiaoliang Wang, Qingquan Liu, Xuedong Chen, Huaning Wang   +4 more
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