Abstract
Passages of people or cattle through narrow entrances or exits occur in manifold situations. They are difficult to study experimentally, because one has to carefully separate objective, physical parameters from subjective, individual motivations, manners and temperament. Mechanically excited physical model systems can help to discriminate some of these classes of parameters. We characterize active and passive particles of equal shape and mass on a vibrating plate and study their bottleneck passage dynamics. They show fundamentally different scaling behavior.
Highlights
Passages of people or cattle through narrow entrances or exits occur in manifold situations
This paper describes the preparation of grains with tuned propagation characteristics and their dynamic behavior in different geometries
We have studied the dynamic behavior of active and passive spherocylinders on a plane in different situations, starting with the motion on a horizontal plane, where the active grains exhibit a directed propagation in the direction of their long axis, while the passive grains move purely diffusively
Summary
The differences between the active and passive grains are obvious when the Mean Squared Displacements (MSD) of capsule motion along their long axis and perpendicular to it are computed. During this short time interval, the orientation of the spherocylinders remains nearly preserved. The border of the vibrating dish is surrounded by an elevated slanted rim that makes an angle of ≈ 45◦ with the plate. This slope obviously inhibits the locking of active grains, they reorient and continue moving (see, Sec. 4 on sedimentation patterns)
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