Mechanical Operations
In a mixer, the quantity, (v. L/D) is termed as __________ number(where, v = longitudinal velocity of material, L = length of the mixer, D = diffusivity in axial mixing).

Schmidt
Peclet
Weber
Brinkman

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Mechanical Operations
For a non-spherical particle, the sphericity

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
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

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