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Mixing Controlled Adsorption at the Liquid-Solid Interfaces in Unsaturated Porous Media
Ishaan Markale1,2, Andrés Velásquez-Parra1,2, Andrés Alcolea3
1Department of Water Resources and Drinking Water, Eawag, 8600 Dübendorf, Switzerland.
Transport in Porous Media
|January 23, 2023
Summary
Adsorption in the unsaturated zone is complex. Decreasing liquid saturation enhances mixing but reduces adsorbed mass, mainly along preferential flow paths, showing nonlinear adsorption behavior.
Area of Science:
- Environmental Science
- Soil Science
- Geochemistry
Background:
- The unsaturated zone is critical for subsurface substance fate.
- Adsorption processes influence substance residence time.
- Understanding pore-scale adsorption mechanisms is essential.
Purpose of the Study:
- To investigate pore-scale mechanisms controlling adsorption in unsaturated systems.
- To analyze flow, transport, and adsorption under varying liquid saturation.
- To elucidate the impact of mixing and interface properties on adsorption.
Main Methods:
- Combined 2D pore-scale experimental imaging with numerical simulations.
- Analyzed surfactant transport and adsorption dynamics.
- Investigated effects of isotherm shape and liquid-gas interfaces.
Main Results:
- Decreasing saturation enhances mixing, reducing adsorbed mass along preferential flow paths.
- Observed nonlinear adsorption behavior with respect to liquid saturation.
- Identified preferential flow paths and stagnation zones influencing adsorption.
Conclusions:
- Mixing enhancement with decreasing saturation reduces overall adsorption.
- Adsorption is primarily concentrated in preferential flow paths.
- Nonlinear adsorption dependence on saturation is linked to evolving flow path dynamics.
Keywords:
DilutionIsotherm functional shapePhase saturationPore-scale adsorptionSolute mixingSurfactantsMore Related Videos
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