Forcing and velocity correlations in a vibrated granular monolayer |
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Authors: | Prevost Alexis Egolf David A Urbach Jeffrey S |
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Institution: | Department of Physics, Georgetown University, Washington, D.C., 20057, USA. prevost@physics.georgetown.edu |
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Abstract: | The role of forcing on the dynamics of a vertically shaken granular monolayer is investigated. Using a flat plate, surprising negative velocity correlations are measured. A mechanism for this anticorrelation is proposed with support from both experimental results and molecular dynamics simulations. Using a rough plate, velocity correlations are positive, and the velocity distribution evolves from a Gaussian at very low densities to a broader distribution at high densities. These results are interpreted as a balance between stochastic forcing, interparticle collisions, and friction with the plate. |
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