Dynamics of interacting vesicles and rheology of vesicle suspension in shear flowV. Kantsler, E. Segre and V. Steinberg
Department of Physics of Complex Systems, Weizmann Institute of Science - Rehovot, 76100 Israel
received 28 January 2008; accepted in final form 15 April 2008; published June 2008
published online 29 May 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, , though the functional dependence of and the transition path to tumbling motion is preserved. The dependence of the suspension viscosity on the viscosity ratio between inner and outer fluids, , was found to be non-monotonic and surprisingly growing with at the fixed outer fluid viscosity for < 1, at odds with recent predictions made for a dilute suspension of non-interacting vesicles.
87.16.D- - Membranes, bilayers, and vesicles.
47.61.-k - Micro- and nano- scale flow phenomena.
47.63.-b - Biological fluid dynamics.
© EPLA 2008