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Shape Transitions of Fluid Vesicles and Red Blood Cells in Capillary Flows
Ist Teil von
Proceedings of the National Academy of Sciences - PNAS, 2005-10, Vol.102 (40), p.14159-14164
Ort / Verlag
United States: National Academy of Sciences
Erscheinungsjahr
2005
Link zum Volltext
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
The dynamics of fluid vesicles and red blood cells (RBCs) in cylindrical capillary flow is studied by using a three-dimensional mesoscopic simulation approach. As flow velocity increases, a model RBC is found to transit from a nonaxisymmetric discocyteto an axisymmetric parachute shape (coaxial with the flow axis), while a fluid vesicle is found to transit from a discocyte to a prolate ellipsoid. Both shape transitions reduce the flow resistance. The critical velocities of the shape transitions are linearly dependent on the bending rigidity and on the shear modulus of the membrane. Slipper-like shapes of the RBC model are observed around the transition velocities. Our results are in good agreement with experiments on RBCs.