Numerical study of drying process and columnar fracture process in granules-water mixtures

Details Numerical study of drying process and columnar fracture process in granules-water mixtures Numerical study of drying process and columnar fracture process in granules-water mixtures

2007-02-05

arxiv.org/abs/cond-mat/0702083v2

Physics

Condensed Matter

Soft Condensed Matter

12 pages, 14 figures

Scientific paper

10.1103/PhysRevE.76.016102

The formation of three-dimensional prismatic cracks in the drying process of starch-water mixtures is investigated numerically. We assume that the mixture is an elastic porous medium which possesses a stress field and a water content field. The evolution of both fields are represented by a spring network and a phenomenological model with the water potential, respectively. We find that the water content distribution has a propagating front which is not explained by a simple diffusion process. The prismatic structure of cracks driven by the water content field is observed. The depth dependence and the coarsening process of the columnar structure are also studied. The particle diameter dependence of the scale of the columns and the effect of the crack networks on the dynamics of the water content field are also discussed.

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