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Abstract: Wet granular materials are characterized by a defined bond energy in theirparticle interaction such that breaking a bond implies an irreversible loss ofa fixed amount of energy. Associated with the bond energy is a nonequilibriumtransition, setting in as the granular temperature falls below the bond energy.The subsequent aggregation of particles into clusters is shown to be aself-similar growth process with a cluster size distribution that obeysscaling. In the early phase of aggregation the clusters are fractals withD f=2, for later times we observe gelation. We use simple scaling arguments toderive the temperature decay in the early and late stages of cooling and verifyour results with event-driven simulations.



Author: Stephan Ulrich, Timo Aspelmeier, Klaus Roeller, Axel Fingerle, Stephan Herminghaus, Annette Zippelius

Source: https://arxiv.org/







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