Polytechnic University of Valencia Congress, 21st International Drying Symposium

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Capillary disconnect during drying in model porous media at different wettability
Ayorinde K Rufai, John P Crawshaw

Last modified: 26-12-2018

Abstract


We carried out drying studies on a 2.5D micromodel based on a thin section of a carbonate rock to investigate the impact of wettability on the capillary disconnect, the moment when liquid films de-pin from the external evaporating surface.  While this is coincident with the transition to low evaporation rate (diffusion limited) for deionized-water, our experiments show, the corner wetting films persisted after the transition to low evaporation rate for both water-wet and mixed-wet micromodels for brine, as solid salt continued to build up at the external evaporating surface. Fully oil wet micromodels showed a drying rate transition coincident with de-pinning.

Keywords: Capillary; Liquid films; Micromodel; Wettability; Crystallization

 


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