Cooling and aggregation in wet granulates

Details Cooling and aggregation in wet granulates Cooling and aggregation in wet granulates

2008-11-25

arxiv.org/abs/0811.4126v2

Phys. Rev. Lett. 102, 148002 (2009)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 6 figures, suggestions of the referees implemented, EPAPS supplementary material added: http://netserver.aip.org/cg

Scientific paper

10.1103/PhysRevLett.102.148002

Wet granular materials are characterized by a defined bond energy in their particle interaction such that breaking a bond implies an irreversible loss of a fixed amount of energy. Associated with the bond energy is a nonequilibrium transition, setting in as the granular temperature falls below the bond energy. The subsequent aggregation of particles into clusters is shown to be a self-similar growth process with a cluster size distribution that obeys scaling. In the early phase of aggregation the clusters are fractals with D_f=2, for later times we observe gelation. We use simple scaling arguments to derive the temperature decay in the early and late stages of cooling and verify our results with event-driven simulations.

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