Swinging of red blood cells under shear flow

Details Swinging of red blood cells under shear flow Swinging of red blood cells under shear flow

2007-01-15

arxiv.org/abs/physics/0701174v1

Physics

Biological Physics

4 pages 5 figures submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.98.188302

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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