Volume 82, Number 5, June 2008
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||29 May 2008|
Dynamics of interacting vesicles and rheology of vesicle suspension in shear flow
Department of Physics of Complex Systems, Weizmann Institute of Science - Rehovot, 76100 Israel
Accepted: 15 April 2008
We studied the dynamics of isolated vesicles as well as vesicle interactions in semi-dilute vesicle suspensions subjected to a shear flow. We found that the long-range hydrodynamic interactions between vesicles give rise to strong fluctuations of vesicle shape and inclination angle, ϕ, though the functional dependence of ϕ and the transition path to tumbling motion is preserved. The dependence of the suspension viscosity on the viscosity ratio between inner and outer fluids, λ, was found to be non-monotonic and surprisingly growing with λ at the fixed outer fluid viscosity for λ < 1, at odds with recent predictions made for a dilute suspension of non-interacting vesicles.
PACS: 87.16.D- – Membranes, bilayers, and vesicles / 47.61.-k – Micro- and nano- scale flow phenomena / 47.63.-b – Biological fluid dynamics
© EPLA, 2008
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