Hydrodynamic and Brownian fluctuations in sedimenting suspensions

J.T. Padding, A.A. Louis

    Research output: Contribution to journalMeeting AbstractAcademic


    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 languageEnglish
    Pages (from-to)S109-S109
    JournalEuropean biophysics journal
    Issue number1
    Publication statusPublished - 2007
    Event6th European Biophysics Congress, EBSA 2007 - London, United Kingdom
    Duration: 14 Jul 200719 Jul 2007
    Conference number: 6


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