Forcing and velocity correlations in a vibrated granular monolayer
|Title||Forcing and velocity correlations in a vibrated granular monolayer|
|Publication Type||Journal Article|
|Year of Publication||2002|
|Authors||Prevost, A., Egolf D. A., and Urbach J. S.|
|Journal||Physical Review Letters|
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.