Impact of Capillary-Driven Liquid Films on Salt Crystallization |
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Authors: | Duc Le Hai Hoang and Jagannathan Mahadevan |
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Institution: | (1) Institute for Geosciences, Christian-Albrechts-Universit?t Zu Kiel, Ludewig-Meyn-Str. 10, 24118 Kiel, Germany;(2) TGF T?bingen Groundwater Research Institute, c/o University of T?bingen, Sigwartstr. 10, 72076 T?bingen, Germany;(3) UFZ Helmholtz Centre for Environmental Research, Permoser Str. 15, 04318 Leipzig, Germany |
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Abstract: | Flow-through drying of ionic liquids in porous media can lead to super saturation and hence crystallization of salts. A model
for the evolution of solid and liquid concentrations of salt, in porous media, due to evaporation by gas flow is presented.
The model takes into account the impact of capillary-driven liquid film flow on the evaporation rates as well as the rate
of transport of salt through those films. It is shown that at high capillary wicking numbers and high dimensionless pressure
drops, supersaturation of brine takes place in the higher drying rate regions in the porous medium. This leads to solid salt
crystallization and accumulation in the higher drying rate region. In the absence of wicking, there is no transport and accumulation
of solid salt. Results from experiments of flow-through drying in rock cores are compared with model prediction of salt crystallization
and accumulation. |
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