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Swinging of red blood cells under shear flow

Manouk Abkarian·Magalie Faivre·Annie Viallat
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Abstract

We reveal that under moderate shear stress (of the order of 0.1 Pa) red blood cells present an oscillation of their inclination (swinging) superimposed to the long-observed steady tanktreading (TT) motion. A model based on a fluid ellipsoid surrounded by a visco-elastic 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 the shear stress, a shear stress-triggered transition towards a narrow shear stress-range intermittent regime of successive swinging and tumbling, and a pure tumbling motion at lower shear stress-values.

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Manouk Abkarian, Magalie Faivre, Annie Viallat. 2007-01-15. Swinging of red blood cells under shear flow. https://doi.org/10.1103/physrevlett.98.188302

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