Breakdown of Energy Equipartition in a 2D Binary Vibrated Granular Gas

Details Breakdown of Energy Equipartition in a 2D Binary Vibrated Granular Gas Breakdown of Energy Equipartition in a 2D Binary Vibrated Granular Gas

2001-11-21

arxiv.org/abs/cond-mat/0111391v2

Phys. Rev. Lett., vol. 88 198301 (2002)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 figures, submitted to Physical Review Letters, updated references

Scientific paper

10.1103/PhysRevLett.88.198301

We report experiments on the equipartition of kinetic energy between grains made of two different materials in a mixture of grains vibrated in 2 dimensions. In general, the two types of grains do not attain the same granular temperature, Tg = 1/2m v^2. However, the ratio of the two temperatures is constant in the bulk of the system and independent of the vibration velocity. The ratio depends strongly on the ratio of mass densities of the grains, but is not sensitive to the inelasticity of grains. Also, this ratio is insensitive to compositional variables of the mixture such as the number fraction of each component and the total number density. We conclude that a single granular temperature, as traditionally defined, does not characterize a multi-component mixture.

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