Dynamics of drying in 3D porous media

Details Dynamics of drying in 3D porous media Dynamics of drying in 3D porous media

2008-07-29

arxiv.org/abs/0807.4757v1

PRL 101, 094502 (2008)

Physics

Fluid Dynamics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.101.094502

The drying dynamics in three dimensional porous media are studied with confocal microscopy. We observe abrupt air invasions in size from single particle to hundreds of particles. We show that these result from the strong flow from menisci in large pores to menisci in small pores during drying. This flow causes air invasions to start in large menisci and subsequently spread throughout the entire system. We measure the size and structure of the air invasions and show that they are in accord with invasion percolation. By varying the particle size and contact angle we unambiguously demonstrate that capillary pressure dominates the drying process.

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