Mechanical Operations
For a non-spherical particle, the sphericity

Has the dimension of length
Is the ratio of volume of a sphere having the same surface area as the particle to the actual volume of the particle
Is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle
Is always less than 1

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Mechanical Operations
During agitation of liquids, the

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

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Mechanical Operations
In case of grinding in a ball mill

Grinding cost and power requirement increases with increasing fineness of the products
All of these
Its capacity decreases with increasing fineness of the products
Wet grinding achieves a finer product size than dry grinding

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