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Velocity profile variations in granular flows with changing boundary conditions: insights from experiments
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10.1063/1.4810973
/content/aip/journal/pof2/25/6/10.1063/1.4810973
http://aip.metastore.ingenta.com/content/aip/journal/pof2/25/6/10.1063/1.4810973

Figures

Image of FIG. 1.
FIG. 1.

(a) Frontal view of the chute, sandpaper is glued on the chute; (b) the laboratory chute in action: the hatch has been opened manually and the ballotini flow down the chute. Strobes illuminate for the high-speed cameras; (c) image of the flow of a medium ballotini avalanche recorded by the high-speed camera; computed velocity field (arrows) and horizontally averaged grey level of the image (mid-grey—red curve) are superimposed.

Image of FIG. 2.
FIG. 2.

The evolution of the velocity profile for three medium ballotini avalanches at a 35° inclination on the three different running surfaces. (a) smooth running surface, (b) rough running surface, (c) very rough running surface. t1 to t7 refer to different times in the high-speed movie. Profiles are plotted every 0.25 s on the smooth running surface and 0.33 s on the rough and the very rough running surface.

Image of FIG. 3.
FIG. 3.

The evolution of the velocity profile for a small ballotini (a) and a large ballotini (b) avalanche at a 35° inclination on the rough running surfaces. t1 to t7 refer to different times in the high-speed movie. Profiles are plotted every 0.33 s.

Image of FIG. 4.
FIG. 4.

Evolution of the velocity profiles for two medium ballotini avalanches at two different inclination angles: (a) 30° and (b) 40° .

Image of FIG. 5.
FIG. 5.

Evolution of the flow depth (a) and the depth averaged velocity (b) in the medium ballotini avalanches when flowing on different running surfaces.

Image of FIG. 6.
FIG. 6.

Depth averaged downstream velocity , slip velocity and surface velocity for two medium ballotini avalanches with the same experimental parameters: 30° inclination, rough running surface.

Image of FIG. 7.
FIG. 7.

Definition of the framework: observation of the avalanches through a side-wall of the chute reduces the problem to two dimensions.

Image of FIG. 8.
FIG. 8.

Velocity profile shape factors of three medium ballotini avalanches flowing on different running surfaces at 35° inclination.

Tables

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Table I.

Material properties of the ballotini.

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/content/aip/journal/pof2/25/6/10.1063/1.4810973
2013-06-28
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Velocity profile variations in granular flows with changing boundary conditions: insights from experiments
http://aip.metastore.ingenta.com/content/aip/journal/pof2/25/6/10.1063/1.4810973
10.1063/1.4810973
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