Dairy Science Information

Separation

Stoke's Law

Stoke's Equation: The velocity at which a fat globule will rise or fall in a liquid varies as the square of its diameter:

V is equal to {d(squared) x (pd-pc) x ra(Squared)} / 18n

Where :

• V =particle velocity
• d=particle diameter
• pd=discrete phase density
• pc=continuous phase density
• r=radius of axis of rotation
• a=angular velocity
• n=continuous phase velocity

note : (r (a Sqared)) is replaced by g (the force of gravity) when not in a centrifugal field
For example, a fat globule with a diameter of 2 microns will rise 4 times faster than a fat globule with a diameter of 1 micron.

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