An analytical analysis of vesicle tumbling under a shear flow

Details An analytical analysis of vesicle tumbling under a shear flow An analytical analysis of vesicle tumbling under a shear flow

2004-01-29

arxiv.org/abs/physics/0401159v2

Physics

Biological Physics

19 pages, 9 figures, to be published in Phys. Rev. E

Scientific paper

10.1103/PhysRevE.69.061914

Vesicles under a shear flow exhibit a tank-treading motion of their membrane, while their long axis points with an angle < 45 degrees with respect to the shear stress if the viscosity contrast between the interior and the exterior is not large enough. Above a certain viscosity contrast, the vesicle undergoes a tumbling bifurcation, a bifurcation which is known for red blood cells. We have recently presented the full numerical analysis of this transition. In this paper, we introduce an analytical model that has the advantage of being both simple enough and capturing the essential features found numerically. The model is based on general considerations and does not resort to the explicit computation of the full hydrodynamic field inside and outside the vesicle.

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