Vortices in vibrated granular rods
Abstract
We report the experimental observation of novel vortex patterns in vertically vibrated granular rods. Above a critical packing fraction, moving domains of nearly vertical rods spontaneously form and coexist with horizontal rods. The small domains of vertical rods that are initially observed coarsen over time to form large vortices. The size of the vortices increases with the number of rods. We track the ends of the vertical rods and obtain the velocity fields of the vortices. The rotation speed of the rods is observed to depend on the vibration velocity of the container and on the packing. We show that the motion is generated due to the inclination of the rods by doing experiments with a row of rods in an annulus.Keywords
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