672926.fig.002a
(a)
672926.fig.002b
(b)
Figure 2: Velocity profiles in radial direction. corresponds to the centre of the sphere and corresponds to the location of the wall. The velocity is normalized with the maximum velocity at the wall. In both figures we assumed that the sphere contains purely viscous fluids and that the frequency of rotations is equal to 20 rad/s. (a) Silicon oil,  Pa·s; (b) water,  Pa·s.