Rheology of dilute suspensions of vesicles and red blood cells

Details Rheology of dilute suspensions of vesicles and red blood cells Rheology of dilute suspensions of vesicles and red blood cells

2007-07-29

arxiv.org/abs/0707.4278v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures

Scientific paper

We present rheology experiments on dilute solutions of vesicles and red blood cells (RBC). Varying the viscosity ratio $\lambda$ between internal and external fluids, the microscopic dynamics of suspended objects can be qualitatively changed from tank-treading ($tt$) to tumbling ($tb$). We find that in the tt regime the viscosity $\eta$, decreases when $\lambda$ increases, in contrast with droplet emulsions and elastic capsule theories which are sometimes invoked to model RBC dynamics. At a critical $\lambda$ (close to the tt-tb transition) $\eta$ exhibits a minimum before it increases in the tb regime. This is consistent with a recent theory for vesicles. This points to the nontrivial fact that the cytoskeleton in RBC does not alter the qualitative evolution of $\eta$ and that, as far as rheology is concerned, vesicle models might be a better description.

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