Regensburg 2010 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 30: Poster: Micro and Nanofluidics
CPP 30.1: Poster
Mittwoch, 24. März 2010, 17:30–19:00, Poster C
Limits of DDFT for sheared suspensions — •Markus Rauscher1,2 and Laura Almenar1,2 — 1Max-Planck-Institut für Metallforschung, Stuttgart, Germany — 2ITAP, Universität Stuttgart, Stuttgart, Germany
Dynamic density functional theory (DDFT) has developed into a versatile tool for modeling the dynamics of interacting Brownian particles. We demonstrate that for the stationary transport of particles advected in straight channel DDFT fails to capture essential features of the system: the density distribution across the channel is changed by the solvent flow, as a result the particle throughput is non-linear in the flow velocity, and the throughputs different particles have to be equal if the particles are so big that they cannot pass each other. We mainly attribute this deficiency of DDFT to the equilibrium approximation for the two-body correlation functions used as a closure relation. And in addition to the grand canonical nature of the density functional.