Dilute Wet Granulates: Nonequilibrium Dynamics and Structure Formation

Details Dilute Wet Granulates: Nonequilibrium Dynamics and Structure Formation Dilute Wet Granulates: Nonequilibrium Dynamics and Structure Formation

2009-06-11

arxiv.org/abs/0906.2167v1

Physics

Condensed Matter

Soft Condensed Matter

14 pages, 20 figures

Scientific paper

We investigate a gas of wet granular particles, covered by a thin liquid film. The dynamic evolution is governed by two-particle interactions, which are mainly due to interfacial forces in contrast to dry granular gases. When two wet grains collide, a capillary bridge is formed and stays intact up to a certain distance of withdrawal when the bridge ruptures, dissipating a fixed amount of energy. A freely cooling system is shown to undergo a nonequillibrium dynamic phase transition from a state with mainly single particles and fast cooling to a state with growing aggregates, such that bridge rupture becomes a rare event and cooling is slow. In the early stage of cluster growth, aggregation is a self-similar process with a fractal dimension of the aggregates approximately equal to D_f ~ 2. At later times, a percolating cluster is observed which ultimately absorbs all the particles. The final cluster is compact on large length scales, but fractal with D_f ~ 2 on small length scales.

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