Structural Nonequilibrium Forces in Driven Colloidal Systems Article Swipe

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Non-equilibrium thermodynamics Brownian dynamics Brownian motion Physics Classical mechanics Smoluchowski coagulation equation Dissipation Statistical physics Limit (mathematics) Force density Perpendicular Body force Mechanics Quantum mechanics Geometry Mathematics Mathematical analysis

Nico C. X. Stuhlmüller , Tobias Eckert , Daniel de las Heras , Matthias Schmidt ·

YOU? · · 2018 · Open Access · · DOI: https://doi.org/10.1103/physrevlett.121.098002 · OA: W2889535954

We identify a structural one-body force field that sustains spatial inhomogeneities in nonequilibrium overdamped Brownian many-body systems. The structural force is perpendicular to the local flow direction, it is free of viscous dissipation, it is microscopically resolved in both space and time, and it can stabilize density gradients. From the time evolution in the exact (Smoluchowski) low-density limit, Brownian dynamics simulations, and a novel power functional approximation, we obtain a quantitative understanding of viscous and structural forces, including memory and shear migration.