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Mass Transfer

Mass Transfer
__________ developed the film theory.

Levenspeil
Fick
Higbie
Ergun

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

95
91.5
90
99

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Mass Transfer
HETP is numerically equal to HTU, only when the operating line

Lies above the equilibrium line
And equilibrium lines are parallel
Lies below the equilibrium line
Is far from the equilibrium line

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Mass Transfer
If moisture content of solid on dry basis is X, then the same on wet basis is

X/(X - 1)
(X + 1)/X
X/(X + 1)
(X - 1)/X

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

1/D
D2
D0.5
D

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