The Impact of Pore-Scale Heterogeneity on Drying Porous Media

Thursday, 18 December 2014
Ran Holtzman1, Oshri Borgman1, Paolo Fantinel2,3 and Lucas Goehring2,3, (1)Hebrew University of Jerusalem, Jerusalem, Israel, (2)Max Planck Institute for Dynamics and Self-Organization, Dynamics of Complex Fluids, Göttingen, Germany, (3)University of Göttingen, Institute for Nonlinear Dynamics, Göttingen, Germany
We study isothermal drying of heterogeneous porous media. An idealized model made of an array of solid cylinders filled with a wetting liquid is exposed to dry air. Evaporation at the liquid-air interface drives the invasion of air into the medium. We seek understanding of how the macroscopic drying behavior—drying rates and patterns—emerge from the pore-scale physics through micromodel experiments and pore-network simulations. Physics of drying in our 2D model is represented as interactions between simple objects: grains, pores, and throats. Preliminary results from the experiments and simulations suggest that the roughness of the air-liquid interface increases with pore-scale heterogeneity, and that liquid transport through thick films plays a significant role.