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    Compaction Dynamics of Wet Granular Assemblies

    Year: 2010

    Journal: Physical review letters, Volume 105, Issue 4, 20111221

    Authors: J. E. Fiscina, 1,2, G. Lumay, 1, F. Ludewig, 1, and N. Vandewalle 1

    Organizations: 1 GRASP, Physics Department B5, University of Liège–B-4000 Liège, Belgium, 2 Experimental Physics, Saarland University, D-66123, Saarbrücken Germany

    The extremely slow compaction dynamics of wet granular assemblies is studied experimentally. The cohesion, due to capillary bridges between neighboring grains, is tuned using different liquids having specific surface tension values. The compaction dynamics of a cohesive packing obeys an inverse logarithmic law, like most dry random packings. However, the characteristic relaxation time τ grows strongly with cohesion. A model, based on free volume kinetic equations and the presence of a capillary energy barrier, is able to reproduce quantitatively the experimental curves.