Figure 7.

The motion of a wrinkle on the RBC surface, marked with cyan circles in the experiment (a) and a simulation (c), at v ≈ 7 mm s^–1. The time between each consecutive image in (a) and (c) is 10 ms and 7.6 ms, respectively. The black dotted line indicates the channel's centerline and dark gray dots represent the cell's center of mass. The white scale bars correspond to a length of 5 μm. The wrinkles in the membrane of the slipper-shaped cell periodically move along the RBC surface. The frequency of this movement is plotted in (b) and (d) as cyan symbols for the experiments and simulations, respectively, together with the frequency of oscillation of the cell's center of mass. Error bars in (b) correspond to averaging over different measurements at a set pressure drop. For the simulation in (c), the positions of the two RBC membrane dimples are highlighted with blue and green markers. The oscillation frequency of the green dimple is plotted in (d).