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Swinging of Red Blood Cells under Shear Flow

2007; American Physical Society; Volume: 98; Issue: 18 Linguagem: Inglês

10.1103/physrevlett.98.188302

1092-0145

Manouk Abkarian, Magalie Faivre, Annie Viallat,

Rheology and Fluid Dynamics Studies

We reveal that under moderate shear stress (etagamma[over ] approximately 0.1 Pa) red blood cells present an oscillation of their inclination (swinging) superimposed to the long-observed steady tank treading (TT) motion. A model based on a fluid ellipsoid surrounded by a viscoelastic membrane initially unstrained (shape memory) predicts all observed features of the motion: an increase of both swinging amplitude and period (1/2 the TT period) upon decreasing etagamma[over ], a etagamma[over ]-triggered transition toward a narrow etagamma[over ] range intermittent regime of successive swinging and tumbling, and a pure tumbling at low etagamma[over ] values.