Hydrodynamic lift of vesicles under shear flow in microgravity

Details Hydrodynamic lift of vesicles under shear flow in microgravity Hydrodynamic lift of vesicles under shear flow in microgravity

2008-04-04

arxiv.org/abs/0804.0761v2

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 8 figures

Scientific paper

10.1209/0295-5075/83/24002

The dynamics of a vesicle suspension in a shear flow between parallel plates has been investigated under microgravity conditions, where vesicles are only submitted to hydrodynamic effects such as lift forces due to the presence of walls and drag forces. The temporal evolution of the spatial distribution of the vesicles has been recorded thanks to digital holographic microscopy, during parabolic flights and under normal gravity conditions. The collected data demonstrates that vesicles are pushed away from the walls with a lift velocity proportional to $\dot{\gamma} R^3/z^2$ where $\dot{\gamma}$ is the shear rate, $R$ the vesicle radius and $z$ its distance from the wall. This scaling as well as the dependence of the lift velocity upon vesicle aspect ratio are consistent with theoretical predictions by Olla [J. Phys. II France {\bf 7}, 1533--1540 (1997)].

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