Mechanical Operations
Crushing efficiency is the ratio of the

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

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Mechanical Operations
Rittinger's crushing law states that

For a given machine and feed, crushing efficiency is dependent on the size of the feed & product
Work required in crushing is proportional to the new surface created
Work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product
Work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product

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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 independent for the curves between power number and Reynolds number in baffled system
All of these
Froude number is used to account for the effect of surface (e.g., the centre vortex) on the power number

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