Regensburg 2016 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 29: Poster - Active Matter, Microswimmers and -fluidics, Statistical Physics Biosystems
DY 29.11: Poster
Dienstag, 8. März 2016, 18:15–21:00, Poster C
Lateral migration of soft microparticles in wavy microchannels — •Matthias Laumann1, Badr Kaoui1, Georg Freund1, Alexander Farutin2, Chaouqi Misbah2, Diego Kienle1, and Walter Zimmermann1 — 1Theoretische Physik I, Universität Bayreuth, 95440 Bayreuth, Germany — 2LiPhy, CNRS-Universite Joseph Fourier, F-28402 Saint-Martin d'Heres Cedex, France
We study the cross-streamline migration (CSM) of deformable particles in the limit of vanishing Reynold number in Poiseuille channel flow, which boundaries are spatially modulated. Using 1D dumbbells, 2D ring polymers, and 3D capsules, we demonstrate how the CSM can be modified when the waviness of the micro-channel is varied. Starting with the case of flat boundaries, these particles perform a CSM that is always directed towards the channel center. In the case of wavy boundaries, this centric motion may be reversed once the modulation amplitude exceeds a threshold, in which case the particles migrate off-center and approach a stationary trajectory, located between the walls and the channel center. The distance between such a trajectory and center can be increased by turning up the modulation amplitude, but depends also on other parameters such as the particle elasticity. The results shown are obtained via a perturbation calculation of the wavy Poiseuille flow in the limit of small modulation amplitudes, and is compared with those from Stokesian particle dynamics for arbitrary modulation amplitudes, showing good agreement. Out study suggests that the flow in wavy microfluidic channels may be exploited for the separation of particles.