Dresden 2006 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.69: Poster

Donnerstag, 30. März 2006, 16:00–18:00, P1

Transport of Colloids in Micro-Channels — •Peter Henseler and Peter Nielaba — Department of Physics, University of Konstanz, D-78457 Konstanz

We carried out non-equilibrium computer simulations in order to investigate the transport of classical particles through channels of various configurations. The particles are driven by externally applied potential gradients. In the corresponding experiment [1] on superparamagnetic colloidal particles this is achieved by tilting the microchannel, so that the particles are driven by the gravitational field. Two different computational methods were used to match to the experimental situation: On the one hand we performed a Molecular Dynamics simulation in combination with a Nosé-Hoover thermostat and on the other hand we did a Langevin Dynamics simulation. Hydrodynamic interactions of the particles were neglected. We will present a comparison of simulation results of both methods and with the experiment on the occurring structures in dependence of the inclination, the strength of the pair interaction between particles and the channel geometry. We will also report on the flow behavior of the particles in the micro-channel.

[1] M. Köppl, A. Erbe and P. Leiderer, University of Konstanz, private communication