Mechanical Operations
Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the

All of these
Ultimate strength of the material
State or manner of application of the crushing force
Elastic constant of the material

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Mechanical Operations
A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ρL) located at a radial distance R from the axis of rotation. The thickness of the liquid film is δ and no cake is formed. The initial pressure drop during filtration is

½w² . R² . ρL
½w² . δ² . ρL
½w² . δρL (2R + δ)
½w² . R . ρL(R + 2δ)

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Mechanical Operations
A filter press is

Not suitable for wide range of materials under varying operating conditions of cake thickness and pressure
Having prohibitively high maintenance cost
A batch filter
Not suitable, if the liquid is the main product

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