Reynolds number Terminal centrifugal velocity

For low Reynolds numbers, where Stokes law applies, the drop terminal centrifugal velocity can be defined as... 

Equation (7.40) is known as Stokes law, and it applies for particle Reynolds numbers less than 1.0. At = 1.0, Co = 26.5 instead of 24.0 from Eq. (7.38), and since the terminal velocity depends on the square root of the drag coefficient, Stokes law is about 5 percent in error at this point. Equation (7.40) can be modified to predict the velocity of a small sphere in a centrifugal field by substituting rco for g. 

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