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Knowledge about the flow field of the plasma around the red blood cells incapillary flow is important for a physical understanding of blood flow and thetransport of micro- and nanoparticles and molecules in the flowing plasma. Weconduct an experimental study on the flow field around red blood cells incapillary flow that are complemented by simulations of vortical flow betweenred blood cells. Red blood cells were injected in a 10x12 micrometerrectangular microchannel at a low hematocrit and the flow field around a singleor two cells have been characterized thanks to a highspeed camera and bytracking 250 nm nanoparticles in flow behaving as tracers. While the flow fieldaround a steady croissant shape is found to be relatively similar to that of arigid sphere, the flow field around a slipper shape exhibits a small vortex atthe rear of the red blood cell. Even more pronounced are vortex-like structuresobserved in the central region between two neighboring croissants. Conclusions:The rotation frequency of the vortices is to a good approximation, inverselyproportional to the distance between the cells. Our experimental data areconfirmed and complemented by numerical simulations.

Vortical flow structures induced by red blood cells in capillaries