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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)

D
D0.5
1/D
D2

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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)

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

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Mass Transfer
At what percentage (by volume) of alcohol composition, it forms an azeotrope with water?

99
91.5
90
95

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Mass Transfer
Mechanism of moisture removal in case of freeze drying of food stuff is by

Dehydration
Adsorption
Sublimation
Evaporation

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Mass Transfer
With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency

Increases
Remains same
May increase or decrease ; depends on individual design
Decreases

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Mass Transfer
The relative volatility of a binary mixture at the azeotropic composition is

∞
1
> 1

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