scholarly journals Kinetically constrained model for gravity-driven granular flow and clogging

2019 ◽  
Vol 100 (3) ◽  
Author(s):  
Gregory Bolshak ◽  
Rakesh Chatterjee ◽  
Rotem Lieberman ◽  
Yair Shokef
Keyword(s):  
Granular Flow ◽  
Gravity Driven ◽  
Constrained Model

Comparison of Heat Transfer in Gravity-Driven Granular Flow near Different Surfaces

2020 ◽  
Author(s):  
Zhigang Guo ◽  
Xing Tian ◽  
Jian Yang ◽  
Tuo Shi ◽  
Qiuwang Wang
Keyword(s):  
Heat Transfer ◽  
Granular Flow ◽  
Gravity Driven

Density waves in gravity-driven granular flow through a channel

2002 ◽  
Vol 14 (9) ◽  
pp. 3309-3326 ◽  
Author(s):  
Elizabeth D. Liss ◽  
Stephen L. Conway ◽  
Benjamin J. Glasser
Keyword(s):  
Granular Flow ◽  
Density Waves ◽  
Gravity Driven ◽  
Flow Through

Gravity-Driven Flows of Smooth, Inelastic Disks Between Parallel Bumpy Boundaries

1993 ◽  
Vol 60 (1) ◽  
pp. 59-64 ◽  
Author(s):  
M. Babic´
Keyword(s):  
Boundary Conditions ◽  
Granular Flow ◽  
Shooting Method ◽  
Particle Flux ◽  
Numerical Procedure ◽  
Present Theory ◽  
Gravity Driven ◽  
Temperature Shear ◽  
Air Table ◽  
Fluctuation Energy

The problem of a steady gravity-driven granular flow of identical, smooth, slightly inelastic, circular disks between parallel bumpy boundaries is analyzed. The balance laws, constitutive equations and boundary conditions obtained by the kinetic theory (Richman and Chou, 1988) are utilized. Both collisional and transport contributions to the fluxes of momentum and fluctuation energy are considered. The problem is reduced to a system of coupled differential equations governing the transverse variations of granular temperature, shear stress, and solid fraction with the appropriate boundary conditions. The numerical procedure is developed using a variation of shooting method in order to simultaneously satisfy all of the boundary conditions. The particle flux (discharge) calculated using the present theory compares favorably with the data from numerical simulations and air table experiments reported by Sanders et al. (1988).

scholarly journals Dynamics and stress in gravity-driven granular flow

1999 ◽  
Vol 59 (3) ◽  
pp. 3289-3292 ◽  
Author(s):  
Colin Denniston ◽  
Hao Li
Keyword(s):  
Granular Flow ◽  
Gravity Driven

scholarly journals Flow of dense avalanches past obstructions

2001 ◽  
Vol 32 ◽  
pp. 281-284 ◽  
Author(s):  
Y. C. Tai ◽  
J. M. N.T. Gray ◽  
K. Hutter ◽  
S. Noelle
Keyword(s):  
Granular Flow ◽  
Laboratory Experiments ◽  
Flow Direction ◽  
Shock Formation ◽  
Finite Mass ◽  
Inclined Plane ◽  
Avalanche Flow ◽  
Gravity Driven ◽  
Velocity Changes ◽  
Curved Walls

AbstractOne means of preventing areas from being hit by avalanches is to divert the flow by straight or curved walls or tetrahedral or cylindrical-type structures. Thus, there arises the question how a given avalanche flow is changed regarding the diverted-flow depth and flow direction. In this paper a report is given on laboratory experiments performed for gravity-driven dense granular flows down an inclined plane obstructed by plane wall and tetrahedral wedge. It was observed that these flows are accompanied by shocks induced by the presence of the obstacles. These give rise to a transition from super-to subcritical flow of the granular avalanche, associated with depth and velocity changes. It is demonstrated that with an appropriate shock-capturing integration technique for the Savage-Hutter theory, the shock formation for a finite-mass granular flow sliding from an inclined plane into a horizontal run-out zone is well described, as is the shock formation of the granular flow on either side of a tetrahedral protection structure.

scholarly journals Granular Matter Transport in Vertical Pipes: The Influence of Pipe Outlet Conditions on Gravity-driven Granular Flow

2016 ◽  
Vol 63 (1) ◽  
pp. 62-76
Author(s):  
Miha Jaklič ◽  
Klemen Kočevar ◽  
Stanko Srčič ◽  
Rok Dreu
Keyword(s):  
Granular Flow ◽  
Granular Matter ◽  
Matter Transport ◽  
Gravity Driven ◽  
Pipe Outlet

scholarly journals Experimental and numerical study of granular flow and fence interaction

2004 ◽  
Vol 38 ◽  
pp. 135-138 ◽  
Author(s):  
Thierry Faug ◽  
Mohamed Naaim ◽  
Florence Naaim-Bouvet
Keyword(s):  
Granular Flow ◽  
Numerical Study ◽  
Slope Angle ◽  
Granular Flows ◽  
Snow Avalanches ◽  
Shallow Water Theory ◽  
Gravity Driven ◽  
Deposition Processes ◽  
Set Up ◽  
Good Agreement

AbstractDense snow avalanches are regarded as dry granular flows. This paper presents experimental and numerical modelling of deposition processes occurring when a gravity-driven granular flow meets a fence. A specific experimental device was set up, and a numerical model based on shallow-water theory and including a deposition model was used. Both tools were used to quantify how the retained volume upstream of the fence is influenced by the channel inclination and the obstacle height. We identified two regimes depending on the slope angle. In the slope-angle range where a steady flow is possible, the retained volume has two contributions: deposition along the channel due to the roughness of the bed and deposition due to the fence. The retained volume results only from the fence effects for higher slopes. The effects of slope on the retained volume also showed these two regimes. For low slopes, the retained volume decreases strongly with increasing slope. For higher slopes, the retained volume decreases weakly with increasing slope. Comparison between the experiments and computed data showed good agreement concerning the effect of fence height on the retained volume.

scholarly journals Force fluctuations at the transition from quasi-static to inertial granular flow

Soft Matter ◽  
2019 ◽  
Vol 15 (42) ◽  
pp. 8532-8542 ◽  
Author(s):  
A. L. Thomas ◽  
Zhu Tang ◽  
Karen E. Daniels ◽  
N. M. Vriend
Keyword(s):  
Granular Flow ◽  
Granular Flows ◽  
Force Fluctuations ◽  
Gravity Driven

We analyse the rheology of gravity-driven, dry granular flows in experiments where individual forces within the flow bulk are measured.

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