Phys. Rev. Lett. 102, 148102 (2009) [4 pages]Vesicles in Poiseuille FlowReceived 12 April 2008; published 10 April 2009 Blood microcirculation critically depends on the migration of red cells towards the flow centerline. We identify theoretically the ratio of the inner over the outer fluid viscosities λ as a key parameter. At low λ, the vesicle deforms into a tank-treading ellipsoid shape far away from the flow centerline. The migration is always towards the flow centerline, unlike drops. Above a critical λ, the vesicle tumbles or breaths and migration is suppressed. A surprising coexistence of two types of shapes at the centerline, a bulletlike and a parachutelike shape, is predicted. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.148102
DOI:
10.1103/PhysRevLett.102.148102
PACS:
87.16.dm, 83.50.Ha
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