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Figure 9


Fig. 9. 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, given in the text, correspond closely to the experimental, and the results shown are typical of the flow in the annular space in the region 0.20<=z/Lt<=0.60 or, equivalently, 0.33<=z/Lf<=1 for times t>=0.025 s. In this region the only significant velocity component is the axial, Uz, which presents the skewed parabolic profile shape characteristic of the developed flow through an annular passage. The black and green bars denote the lengths, to scale, of 0.25xdf mechanoreceptor (MR) sensilla oriented normal to the flagellum surface.





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