Hydrodynamic and Brownian Fluctuations in Sedimenting Suspensions

Abstract

We use a mesoscopic computer simulation method to study the interplay between hydrodynamic and Brownian fluctuations during steady-state sedimentation of hard sphere particles for Peclet numbers (Pe) ranging from 0.1 to 15. Even when the hydrodynamic interactions are an order of magnitude weaker than Brownian forces, they still induce backflow effects that dominate the reduction of the average sedimentation velocity with increasing particle packing fraction. Velocity fluctuations, on the other hand, begin to show nonequilibrium hydrodynamic character for Pe > 1

4 pages 4 figures, RevTex, to appear in Phys. Rev. Lett. New version with some minor corrections

Cited by in corpus (18)

• Hydrodynamic interactions and Brownian forces in colloidal suspensions: Coarse-graining over time and length-scales
• Multi-Particle Collision Dynamics -- a Particle-Based Mesoscale Simulation Approach to the Hydrodynamics of Complex Fluids
• Simulation of Claylike Colloids
• The role of collective motion in examples of coarsening and self-assembly
• Non-equilibrium sedimentation of colloids on the particle scale
• Transport coefficients of off-lattice mesoscale-hydrodynamics simulation techniques
• Relevance of angular momentum conservation in mesoscale hydrodynamics simulations
• Influence of hydrodynamic interactions on lane formation in oppositely charged driven colloids
• Dynamical density functional theory with hydrodynamic interactions and colloids in unstable traps
• Dynamic correlations in stochastic rotation dynamics
• The interplay between hydrodynamic and Brownian fluctuations in sedimenting colloidal suspensions
• Stress Tensors of Multiparticle Collision Dynamics Fluids
• Colloids dragged through a polymer solution: experiment, theory and simulation
• Multi-particle collision dynamics modeling of viscoelastic fluids
• A Stability Diagram for Dense Suspensions of Model Colloidal Al2O3-Particles in Shear Flow
• Formation and growth of clusters in colloidal suspensions
• Efficient simulation of non-crossing fibers and chains in a hydrodynamic solvent
• Computational Steering of Cluster Formation in Brownian Suspensions