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Coarsening of granular clusters: Two types of scaling behaviors
M V Sapozhnikov1, I S Aranson, J S Olafsen
1Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA.
Abstract:
We report on an experimental study of small cluster dynamics during the coarsening process in driven granular submonolayers of 120-microm bronze particles. The techniques of electrostatic and vertical mechanical vibration were employed to excite the granular gas. We measure the scaling exponent for the evaporation of small clusters during coarsening. It was found that the surface area of small clusters S vs time t behaves as S to (t(0)-t)(2/3) for lower frequencies and S to (t(0)-t) for higher frequencies. We argue that the change in the scaling exponent is related to the transition from three-dimensional (3D) to 2D character of motion in the granular gas.
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