Velocity correlations in dense granular gases

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  • 2 January 2001
Abstract
We report the statistical properties of spherical steel particles rolling on an inclined surface being driven by an oscillating wall. Strong dissipation occurs due to collisions between particles and can be tuned by changing the number density. The velocities of the particles are observed to be correlated over large distances comparable to the system size. The distribution of the velocity strongly deviates from a Gaussian. The degree of the deviation, as measured by the kurtosis of the distribution is observed to be as much as four times the value corresponding to a Gaussian, signaling a significant breakdown of the assumptions of negligible velocity correlations in our system.

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