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Convection in deep vertically shaken particle beds. III. Convection mechanisms
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10.1063/1.2996136
/content/aip/journal/pof2/20/10/10.1063/1.2996136
http://aip.metastore.ingenta.com/content/aip/journal/pof2/20/10/10.1063/1.2996136
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Average velocity profiles: (a) , (b) , and (c) .

Image of FIG. 2.
FIG. 2.

The bottom wall stress and position histories for . The bottom plot is annotated by the periods at which the downward motion at the sidewalls is driven by various mechanisms discussed in Sec. I. [The stress plot is scaled with its maximum value, .]

Image of FIG. 3.
FIG. 3.

The bottom wall stress and position histories for . At the bottom the plot is annotated by the periods at which the downward motion at the sidewalls is driven by various mechanisms discussed in Sec. I. [The stress plot is scaled with its maximum value, .]

Image of FIG. 4.
FIG. 4.

The bottom wall stress and position histories for . The bottom if plot is annotated by the periods at which the downward motion at the sidewalls is driven by various mechanisms discussed in Sec. I. [The stress plot is scaled with its maximum value, .]

Image of FIG. 5.
FIG. 5.

The conditions in the bed immediately after the compression wave has passed through the bed: (a) , (b) , and (c) . (These correspond to the times marked as “5a,” “5b,” and “5c” in Figs. 2–4.)

Image of FIG. 6.
FIG. 6.

Convection is driven by friction on sidewalls for a short time in case of (The corresponding time is marked as “6” in Fig. 2.)

Image of FIG. 7.
FIG. 7.

The conditions in the bed during convection driven by gravity: (a) , (b) , and (c) . (The times correspond to the points marked as “7a,” “7b,” and “7c” in Figs. 2–4.)

Image of FIG. 8.
FIG. 8.

The conditions in the bed at the end of convection: (a) , (b) , and (c) (marked as “8a,” “8b,” and “8c” in Figs. 2–4).

Image of FIG. 9.
FIG. 9.

The Heap developing on the free surface of the bed for case of . The compression wave collides with the free surface at approximately plot b (Ref. 17), while convection occurs from d to f.

Image of FIG. 10.
FIG. 10.

The angles of slopes of the Heaps during convection for each case: (a) , (b) , and (c) .

Image of FIG. 11.
FIG. 11.

The distribution of -direction : (a) before convection begins, (b) at the beginning, and (c) near the end of the convection period, .

Image of FIG. 12.
FIG. 12.

A simple model to show the action of inward forces: (a) Particles are pressed against the wall while the force is applied on particles in horizontal direction, and (b) when the force is removed, the particles are relaxed and the inward force from the wall will push the particles in the opposite direction with the applied force. Then, the particles move away from the wall.

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/content/aip/journal/pof2/20/10/10.1063/1.2996136
2008-10-22
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Convection in deep vertically shaken particle beds. III. Convection mechanisms
http://aip.metastore.ingenta.com/content/aip/journal/pof2/20/10/10.1063/1.2996136
10.1063/1.2996136
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