Mechanical Operations
In case of a hammer crusher, the

Minimum product size is 3 mm
Maximum feed size may be 50 mm
Rotor shaft carrying hammers can be vertical or horizontal
Feed may be highly abrasive (Moh's scale >5)

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Mechanical Operations
During agitation of liquids, the

Power number becomes independent of impellers Reynolds number at high Reynolds number, but is dependent on the geometry of the impeller
Froude number is used to account for the effect of surface (e.g., the centre vortex) on the power number
Froude number is independent for the curves between power number and Reynolds number in baffled system
All of these

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