Hydrodynamic and Brownian fluctuations in sedimenting suspensions

J.T. Padding; A.A. Louis

doi:10.1007/s00249-007-0178-7

Abstract

We adapt stochastic rotation dynamics, a mesoscopic computer simulation method, to colloidal suspensions, making sure length- and time-scales are carefully separated to generate the correct coarsegrained physical properties. This allows us to study the interplay between hydrodynamic and Brownian fluctuations during steadystate 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.

Original language	English
Pages (from-to)	S109-S109
Journal	European biophysics journal
Volume	36
Issue number	1
DOIs	https://doi.org/10.1007/s00249-007-0178-7
Publication status	Published - 2007
Event	6th European Biophysics Congress, EBSA 2007 - London, United Kingdom Duration: 14 Jul 2007 → 19 Jul 2007 Conference number: 6

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title = "Hydrodynamic and Brownian fluctuations in sedimenting suspensions",

abstract = "We adapt stochastic rotation dynamics, a mesoscopic computer simulation method, to colloidal suspensions, making sure length- and time-scales are carefully separated to generate the correct coarsegrained physical properties. This allows us to study the interplay between hydrodynamic and Brownian fluctuations during steadystate 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.",

author = "J.T. Padding and A.A. Louis",

year = "2007",

doi = "10.1007/s00249-007-0178-7",

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TY - JOUR

T1 - Hydrodynamic and Brownian fluctuations in sedimenting suspensions

AU - Padding, J.T.

AU - Louis, A.A.

N1 - Conference code: 6

PY - 2007

Y1 - 2007

N2 - We adapt stochastic rotation dynamics, a mesoscopic computer simulation method, to colloidal suspensions, making sure length- and time-scales are carefully separated to generate the correct coarsegrained physical properties. This allows us to study the interplay between hydrodynamic and Brownian fluctuations during steadystate 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.

AB - We adapt stochastic rotation dynamics, a mesoscopic computer simulation method, to colloidal suspensions, making sure length- and time-scales are carefully separated to generate the correct coarsegrained physical properties. This allows us to study the interplay between hydrodynamic and Brownian fluctuations during steadystate 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.

U2 - 10.1007/s00249-007-0178-7

DO - 10.1007/s00249-007-0178-7

M3 - Meeting Abstract

SN - 0175-7571

VL - 36

SP - S109-S109

JO - European biophysics journal

JF - European biophysics journal

IS - 1

T2 - 6th European Biophysics Congress, EBSA 2007

Y2 - 14 July 2007 through 19 July 2007

ER -

Hydrodynamic and Brownian fluctuations in sedimenting suspensions

Abstract

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