期刊
PHYSICAL REVIEW FLUIDS
卷 6, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevFluids.6.034202
关键词
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资金
- MRSEC Program [DMR-1420073]
- National Science Foundation [CBET-1706562]
- National Science Foundation via the Research Training Group in Modeling and Simulation [RTG/DMS-1646339]
- NASA [NNX13AR67G S017]
The study investigates the driven collective dynamics of a colloidal monolayer sedimenting down an inclined plane, leading to the formation of a triangular inhomogeneous density profile with a traveling density shock at the leading front. Through experimental measurements and particle-based computer simulations, it is found that the Burgers equation can model the density profile along the sedimentation direction remarkably well, with a modest improvement when accounting for the sublinear dependence of the collective sedimentation velocity on density.
We study the driven collective dynamics of a colloidal monolayer sedimenting down an inclined plane. The action of the gravity force parallel to the bottom wall creates a flow around each colloid, and the hydrodynamic interactions among the colloids accelerate the sedimentation as the local density increases. This leads to the creation of a universal triangular inhomogeneous density profile, with a traveling density shock at the leading front moving in the downhill direction. Unlike density shocks in a colloidal monolayer driven by applied torques rather than forces [Phys. Rev. Fluids 2, 092301(R) (2017)], the density front during sedimentation remains stable over long periods of time even though it develops a roughness on the order of tens of particle diameters. Through experimental measurements and particle-based computer simulations, we find that the Burgers equation can model the density profile along the sedimentation direction as a function of time remarkably well, with a modest improvement if the nonlinear conservation law accounts for the sublinear dependence of the collective sedimentation velocity on density.
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