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Abstract:
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 modeled 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.
