Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2006-05-26
Physics
Condensed Matter
Soft Condensed Matter
11 pages, 4 figures
Scientific paper
We consider the motion of red blood cells and other non-spherical microcapsules dilutely suspended in a simple shear flow. Our analysis indicates that depending on the viscosity, membrane elasticity, geometry and shear rate, the particle exhibits either tumbling, tank-treading of the membrane about the viscous interior with periodic oscillations of the orientation angle, or intermittent behavior in which the two modes occur alternately. For red blood cells, we compute the complete phase diagram and identify a novel tank-treading-to-tumbling transition at low shear rates. Observations of such motions coupled with our theoretical framework may provide a sensitive means of assessing capsule properties.
Secomb T. W.
Skotheim Jan M.
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