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Mass Transfer

Mass Transfer
According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)

D2
D0.5
D
1/D

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Mass Transfer
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)

FG/(G.a)
F/(FG.a)
L/(FG.G)
(G.a)/FG

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Mass Transfer
The ratio of Murphree plate efficiency to point efficiency is always > 1 in a __________ flow model.

Plug
None of the listed here
Perfectly mixed
Both plug & perfectly mixed

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Mass Transfer
Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the __________ moisture.

Unbound
Bound
None of these
Critical

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Mass Transfer
Schmidt number is given by

Re.Pe
Sh x Pe
Μ/ρDAB
Re/Pe

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Mass Transfer
Solvent used in extractive distillation

Forms a high boiling azeotrope
Is of low volatility
Forms a low boiling azeotrope
Does not alter the relative volatility of the original components

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