Chaoticity of the Wet Granular Gas

Details Chaoticity of the Wet Granular Gas Chaoticity of the Wet Granular Gas

2007-05-22

arxiv.org/abs/0705.3121v1

Phys. Rev. E 75, 061301 (2007)

Physics

Condensed Matter

Soft Condensed Matter

13 pages, 10 figures, Physical Review E

Scientific paper

10.1103/PhysRevE.75.061301

In this work we derive an analytic expression for the Kolmogorov-Sinai entropy of dilute wet granular matter, valid for any spatial dimension. The grains are modelled as hard spheres and the influence of the wetting liquid is described according to the Capillary Model, in which dissipation is due to the hysteretic cohesion force of capillary bridges. The Kolmogorov-Sinai entropy is expanded in a series with respect to density. We find a rapid increase of the leading term when liquid is added. This demonstrates the sensitivity of the granular dynamics to humidity, and shows that the liquid significantly increases the chaoticity of the granular gas.

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