Figure 2. Measured flagellar flow field.

(A) Time-dependent flow field for an individual cell measured using particle image velocimetry. Results are shown for the first half of the beating cycle. (B) Time-averaged flow field ${\langle u\rangle }_t=(1/\tau ){{\displaystyle \int }}_0^{\tau }\left|\mathit{u}\left(\mathit{x},t\right)\right|dt$ (averaged across 4 cells with τ ∼ 1000 beats for each). The velocity magnitude (colour) and streamlines (white) are shown. (C) Velocity magnitude upstream (red) and downstream (blue) of the origin (black dot in B).

DOI: http://dx.doi.org/10.7554/eLife.02750.005