Characteristic spatial scale of vesicle pair interactions in a plane linear flow

Details Characteristic spatial scale of vesicle pair interactions in a plane linear flow Characteristic spatial scale of vesicle pair interactions in a plane linear flow

2011-09-08

arxiv.org/abs/1109.1732v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 6 figures

Scientific paper

We report the experimental studies on interaction of two vesicles trapped in a microfluidic analog of four-roll mill, where a plane linear flow is realized. We found that the dynamics of a single vesicle is significantly altered by the presence of another vesicle at separation distances up to about $3.2\div 3.7$ times of effective radius of the vesicles. This is supported by direct measurements of a single vesicle back-reaction on the velocity field. Thus, the experiment provides the lower bound for the interaction scale of vesicles and so the corresponding upper bound for the volume fraction $\phi=0.08\div 0.13$ of non-interacting vesicle suspensions.

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