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Figure 10


Fig. 10. Dimensionless Ux, Uy and Uz velocity component profiles for the flow in the annular space between a rod-like flagellum and a tube around it along the S->N (A) and W->E (B) compass directions (see Fig. 8). Continuous lines denote velocity profiles corresponding to the P->D flow and broken lines to the D->P flow. Calculation conditions, provided in the text, correspond closely to the experimental, and the results shown are typical of the flow in the annular space in the region 0<=z/Lt<=0.20 or, equivalently, 0<=z/Lf<=0.33 for times t>=0.025 s. In this region the three velocity components are roughly comparable in magnitude, with the P->D flow profiles in the vicinity of the mechanoreceptors corresponding closely to the flow around a downward flicking flagellum and the D->P flow profiles to an upward-flicking flagellum. The black and green bars denote the lengths, to scale, of 0.25xdf mechanoreceptor (MR) sensilla oriented normal to the flagellum surface.