Equipartition of rotational and translational energy in a dense granular gas

Details Equipartition of rotational and translational energy in a dense granular gas Equipartition of rotational and translational energy in a dense granular gas

2011-11-11

arxiv.org/abs/1111.2682v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

Experiments quantifying the rotational and translational motion of particles in a dense, driven, 2D granular gas floating on an air table reveal that kinetic energy is divided equally between the two translational and one rotational degrees of freedom. This equipartition persists when the particle properties, confining pressure, packing density, or spatial ordering are changed. While the translational velocity distributions are the same for both large and small particles, the angular velocity distributions scale with the particle radius. The probability distributions of all particle velocities have approximately exponential tails. Additionally, we find that the system can be described with a granular Boyle's Law with a van der Waals-like equation of state. These results demonstrate ways in which conventional statistical mechanics can unexpectedly apply to non-equilibrium systems.

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