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Latin American applied research

Print version ISSN 0327-0793


SEGURA, L. A.  and  TOLEDO, P. G.. Pore-level modeling of isothermal drying of pore networks: Evaporation and viscous flow. Lat. Am. appl. res. [online]. 2005, vol.35, n.1, pp.43-50. ISSN 0327-0793.

Simulation results of drying of non-hygroscopic liquid-wet rigid porous media are presented. Two and three-dimensional pore networks represent pore spaces. Two kinds of mechanisms are considered: evaporation and hydraulic flow. The process is considered under isothermal condition. Under these conditions capillary forces are dominant over viscous forces; drying is thus considered as a modified form of invasion percolation. Liquid in pore corners allows for hydraulic connection throughout the network at all times. As drying progresses, liquid is replaced by vapor by two fundamental mechanisms: evaporation and pressure-gradient-driven liquid flow. Using Monte Carlo simulation, we find evaporation and drainage times; the shortest calculated indicates the controlling mechanism. Here we report distributions of liquid and vapor as drying time advances. Predictive drying curves and liquid distributions compare well with experimental results for hexane in transparent two-dimensional micromodels. Liquid permeability and vapor diffusivity are reported as functions of liquid saturation.

Keywords : Pore-Level Drying; Drying Front; Network Modeling; Monte Carlo Simulation.

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