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Fig. 8. Schematic (not to scale) of a simplified model of the flagellum-in-tube
experiment and definition of the (x, y, z) coordinate system used for
plotting the velocity components Ux,
Uy and Uz. The case shown corresponds
to proximal-to-distal (P
D) flow, entry port A being to the left and exit
port B to the right in the figure. Values for the geometrical dimensions and
volumetric flow rate are given in the text. N, north; S, south; E, east; W,
west.