Pore-scale modelling and tomographic visualisation of drying in granular media

Journal of Colloid and Interface Science
Martin KohoutFrantisek Stepanek

Abstract

Spatio-temporal evolution of liquid phase clusters during drying of a granular medium (realised by random packing of cylindrical particles) has been investigated at the length-scale of individual pores. X-ray microtomography has been used to explicitly resolve the three-dimensional spatial distribution of the solid, liquid, and gas phases within the wet particle assemblies. The propagation of liquid menisci through the granular medium during drying was dynamically followed. The effect of contact angle on the degree of dispersion of the drying front has been studied by observing drying in a layer of untreated (hydrophilic) and silanised particles; the drying front was found to be sharper in the case of the silanised (less hydrophilic) particles. This observation was confirmed by direct numerical simulations of drying in a digitally encoded porous medium identical in structure to the experimental one. The simulations also revealed that the average gas-liquid interfacial area in a given porous microstructure strongly depends on the contact angle.

References

Aug 12, 2003·Journal of Colloid and Interface Science·Steven Bryant, Anna Johnson
Dec 31, 2003·Journal of Colloid and Interface Science·Douglas W Bousfield, George Karles
Jun 2, 2005·Journal of Colloid and Interface Science·M Gladkikh, S Bryant
Nov 18, 2005·Journal of Colloid and Interface Science·Mirrya M Fontenot, R Dennis Vigil
Jan 25, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Frantisek Stepánek, Pavol Rajniak

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Citations

May 6, 2015·Micron : the International Research and Review Journal for Microscopy·Leonardo Carmezini Marques, Carlos Roberto Appoloni
May 21, 2010·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·N ShokriD Or
Sep 26, 2012·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Nima Shokri, Muhammad Sahimi

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