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Mass Transfer

Mass Transfer
Prandtl number for water at 20°C is about

150
0.7
7
70

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Mass Transfer
Calculation of mass transfer co-efficient is mostly/normally done using __________ theory.

None of the listed here
Penetration
Film
Surface renewal

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Mass Transfer
Weeping in a distillation column

Results due to very low gas velocity
Provides large interfacial surface for mass transfer
Results due to very high gas velocity
Increases tray efficiency

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Mass Transfer
If f is defined as above, then which of the following applies to a feed at dew point?

F < 1
F = 1
F > 1
0 < f < 1

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Mass Transfer
The diffusivity (D) in a binary gas mixture is related to the pressure (P) as

D ∝ 1/P0.5
D ∝ 1/P1.5
D ∝ P0.5
D ∝ 1/P

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Mass Transfer
Liquid diffusivity is of the order of __________ cm² /second.

10-5 to 10-6
> 1
0.1
0.01

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