Mechanical Operations
Crushing efficiency is the ratio of the

Surface energy created by crushing to the energy absorbed by the solid
Energy fed to the machine to the surface energy created by crushing
Energy absorbed by the solid to the surface energy created by crushing
Energy absorbed by the solid to that fed to the machine

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Mechanical Operations
During agitation of liquids, the

All of these
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

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