Hydraulics and Fluid Mechanics in ME
In a forced vortex motion, the velocity of flow is

directly proportional to its radial distance from axis of rotation
inversely proportional to its radial distance from the axis of rotation
directly proportional to the square of its radial distance from the axis of rotation
inversely proportional to the square of its radial distance from the axis of rotation

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Hydraulics and Fluid Mechanics in ME
For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal

all the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity
ratio of inertial force to force due to surface tension
ratio of inertial force to force due to viscosity
ratio of inertial force to force due to gravitation

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