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Mass Transfer

Mass Transfer
Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

K ∝ D2
K ∝ D1.5
K ∝ √D
K ∝ D

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

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

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Mass Transfer
In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed

q = 1
q < 1
q > 1
q = 0

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Mass Transfer
The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same sytem is

10
5
1
100

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Mass Transfer
During drying of a solid, the critical moisture content increases with

Increased thickness of the solid
Decreased drying rate
Both B and C
Increased drying rate

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Mass Transfer
To remove all the moisture from a wet solid it requires exposure to __________ air.

Highly humid
Perfectly dry
None of these
High temperature

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