Prograde rotation

Keep in mind that the solutions discussed did not consider viscous effects at the walls and interfaces or the retrograde and prograde rotations of the mixture and clarified fluid, respectively. In most instances of batch separation it is not necessary to consider these effects, although they must generally be taken into account for continuous separations (Greenspan Ungarish 1985). 

In the presence of a prograde and a retrograde mode with equal characteristics, the rotation at the surface region is neither accelerated nor decelerated, and is in uniform rotation in a zero-th order. Is this state stable If the rotation profile is perturbed towards acceleration, intrinsic frequency (seen from rotating frame) of a pro-... 

In Be stars, the uniform rotation have been shown to be unstable in the presence of a prograde and a retrograde mode. Ultimately their rotation profile has been pointed out by Ando(1986) to oscillate quasi-periodically around the uniform rotation (see Ando(1986) for the detailed explanation of the oscillatory behavior of the rotation profile). 

The wind systems on Jupiter and Saturn are strongly westward at the equator, with eastward jets at latitudes above and below the equator. Equatorial wind speeds on Jupiter approach 150 ms in the direction of rotation, and are 3-4 times higher still on Saturn. Measurements by the Galileo probe indicate that the winds persist down to the deepest level, 20 bar, measured by the probe. Uranus shows prograde (in the direction of rotation) winds of 150 m s at midlatitudes, which decline in speed toward the equator. Because of the low contrast of the Uranian clouds at the time of the Voyager flyby, optical tracking... 

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