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Orientation and Dynamics of a Vesicle in Tank-Treading Motion in Shear Flow

2005; American Physical Society; Volume: 95; Issue: 25 Linguagem: Inglês

10.1103/physrevlett.95.258101

1092-0145

Vasily Kantsler, Victor Steinberg,

Lipid Membrane Structure and Behavior

Experimental results on mean inclination angle and its fluctuation due to thermal noise in tank-treading motion of a vesicle in shear flow as a function of vesicle excess area, normalized shear rate, viscosity, and viscosity contrast between inner and outer fluids, $ϵ$, are presented. Good quantitative agreement with theory made for $ϵ=1$ was found. At $ϵ>1$ the dependence is altered significantly. Dependence of the vesicle shape on shear rate is consistent with theory. A tank-treading velocity of the vesicle membrane is found to be a periodic function close to that predicted by theory.