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Understanding the coupling between flow, hydrodynamic transport anddispersion of colloids with finite-size in porous media is a long-standingchallenge. This problem is relevant for a broad range of natural and engineeredsubsurface processes, including contaminant and colloidal transport, mixing ofbio-chemical compounds, kinetics of reactions and groundwater bio-remediation,but also transport phenomena related to different systems like membranes, orblood flow. While classical models for colloidal transport rely onmacro-dispersion theory and do not take into consideration the complex andheterogeneous structure of the porous host medium, recent studies take intoconsideration the detailed structure of the porous system and its impact on thefluid velocity. However, the impact of confinement condition, represented bythe ratio of particles radius $a$ and pore throat size $\lambda$, has beenoverlooked. Here, we use numerical simulations of fluid particle dynamics inresolved porous media to demonstrate that particles confinement affects thefluid macroscopic velocity field u which in turn affects the particlestransport itself. Our results show that even for small confinement conditions($a/\lambda \sim 2$~\%), fluid and transported particles are dynamicallyre-routed towards more permeable paths. This leads to the emergence ofephemeral laminar vortexes at pore throat entrances and affects the varianceand mean fluid velocity.

The influence of finite size particles on fluid velocity and transport though porous media