Influence of hydrodynamics on many-particle diffusion in 2D colloidal suspensions

We study many-particle diffusion in 2D colloidal suspensions with full hydrodynamic interactions through a novel mesoscopic simulation technique. We focus on the behaviour of the effective scaled tracer and collective-diffusion coefficients DT(rho)/D0 and DC(rho)/D0 respectively, where D0 is the sin...

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Bibliographic Details
Published in:The European physical journal. E, Soft matter and biological physics Soft matter and biological physics, 2004-03, Vol.13 (3), p.267-275
Main Authors: FALCK, E, LAHTINEN, J. M, VATTULAINEN, I, ALA-NISSILA, T
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Colloids - chemistry
Complex Mixtures - chemistry
Computer Simulation
Diffusion
Exact sciences and technology
General and physical chemistry
Macromolecular Substances
Microfluidics - methods
Models, Chemical
Models, Statistical
Motion
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Suspensions - chemistry
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Summary:We study many-particle diffusion in 2D colloidal suspensions with full hydrodynamic interactions through a novel mesoscopic simulation technique. We focus on the behaviour of the effective scaled tracer and collective-diffusion coefficients DT(rho)/D0 and DC(rho)/D0 respectively, where D0 is the single-particle diffusion coefficient, as a function of the density of the colloids rho. At low Schmidt numbers Sc - 1, we find that hydrodynamics has essentially no effect on the behaviour of DT (rho)/D0. At larger Sc, DT (rho)/D0 seems to be enhanced at all densities, although the differences compared to the case without hydrodynamics are rather minor. The collective-diffusion coefficient, on the other hand, is much more strongly coupled to hydrodynamical conservation laws and is distinctly different from the purely dissipative case without hydrodynamic interactions.
ISSN:1292-8941
1292-895X
DOI:10.1140/epje/i2003-10075-9