Abstract
We provide an experimental benchmark for modeling nondilute miscible mixing in porous media, which emerges in CO${}_{2}$ sequestration and solvent-based enhanced oil recovery. In a near-fracture porous medium, we show that conventional Darcy-Fickian coupling fails to predict nondilute fluid-fluid displacement, although it works perfectly for dilute systems. Nondilute fluid systems show ``diffusive'' mixing kinetics, wedge-like mixing front, and significant convection at the front that is perpendicular to the concentration gradient. These above abnormal phenomena are rationalized by Korteweg stress, which is still challenging in modeling.
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