Dynamics of fluid vesicles in flow through structured microchannels

Noguchi, H.; Wixforth, A.; Schmid, L.; Franke, T.; Gompper, G.

doi:10.1209/0295-5075/89/28002

Journal Article

PreJuSER-8722

Dynamics of fluid vesicles in flow through structured microchannels

Noguchi, H.FZJ* ; Gompper, G.FZJ* ; Schmid, L.FZJ* ; Wixforth, A.FZJ* ; Franke, T.FZJ*

2010
EDP Sciences Les Ulis

epl 89, 28002 (2010) [10.1209/0295-5075/89/28002]

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Please use a persistent id in citations: http://hdl.handle.net/2128/22975 doi:10.1209/0295-5075/89/28002

Abstract: The dynamics of fluid vesicles is studied under flow in microchannels, in which the width varies periodically along the channel. Three types of flow instabilities of prolate vesicles are found. For small quasi-spherical vesicles-compared to the average channel width perturbation theory predicts a transition from a state with orientational oscillations of a fixed prolate shape to a state with shape oscillations of symmetrical ellipsoidal or bullet-like shapes with increasing. flow velocity. Experimentally, such orientational oscillations are observed during the slow migration of a vesicle towards the centerline of the channel. For larger vesicles, mesoscale hydrodynamics simulations and experiments show similar symmetric shape oscillation at reduced volumes V* greater than or similar to 0.9. However, for non-spherical vesicles with V* less than or similar to 0.9, shapes are found with two symmetric or a single asymmetric tail. Copyright (C) EPLA, 2010

Keyword(s): J

Classification:

Physics, Multidisciplinary

Note: We acknowledge support of this work through the DFG priority program "Nano- and Microfluidics" (SPP 1164) and the "Nanosystems Initiative Munich" (NIM).

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