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Mass Transfer

Mass Transfer
Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as

K ∝ D
K ∝ D2
K ∝ D1.5
K ∝ √D

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Mass Transfer
Pick out the correct relationship. (where, Ri = internal reflux ratio Ro = external reflux ratio. )

(1 + Ro) = Ro/Ri
(1 - Ro) = Ro/Ri
(1 - Ri) = Ro/Ri
(1 + Ri) = Ro/Ri

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Mass Transfer
Stage efficiency in a leaching process depends on the

Vapour pressure of the solution
Time of contact between the solid and the solution
Both A & B
Rate of diffusion of the solute through the solid and into the liquid

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Mass Transfer
Positive deviation from Raoult's law means a mixture whose total pressure is

Less than that computed for ideality
Less than the sum of the vapour pressure of the components
None of these
Greater than that computed for ideality

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Mass Transfer
At 750°K and 1 atm, the approximate value of Schmidt number for air is

10
1
0.1
0.01

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Mass Transfer
According to Chilton-Colburn analogy for mass transfer, NSt.NSc2/3 is equal to

1/f
2f
F/2
F

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