Simple Model for Wet Granular Materials with Liquid Clusters

Details Simple Model for Wet Granular Materials with Liquid Clusters Simple Model for Wet Granular Materials with Liquid Clusters

2009-08-11

arxiv.org/abs/0908.1477v2

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 8 figures. Discussion is updated. Accepted for publication in EPL

Scientific paper

We propose a simple phenomenological model for wet granular media to take into account many particle interaction through liquid in the funicular state as well as two-body cohesive force by a liquid bridge in the pendular state. In the wet granular media with small liquid content, liquid forms a bridge at each contact point, which induces two-body cohesive force due to the surface tension. As the liquid content increases, some liquid bridges merge, and more than two grains interact through a single liquid cluster. In our model, the cohesive force acts between the grains connected by a liquid-gas interface. As the liquid content increases, the number of grains that interact through the liquid increases, but the liquid-gas interface may decrease when liquid clusters are formed. Due to this competition, our model shows that the shear stress has a maximum as a function of the liquid-content.

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