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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)

D2
D
1/D
D0.5

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Mass Transfer
The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by

Both A & B
Raising the temperature
Lowering the total pressure
Neither A nor B

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Mass Transfer
Operating velocity in a packed tower is usually __________ the flooding velocity.

Equal to
Twice
More than
Half

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

0.7
7
150
70

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Mass Transfer
Physical absorption is

A reversible phenomenon
Accompanied by evolution of heat
Both B & C
An irreversible phenomenon

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Mass Transfer
Batch tray dryers suffers from the disadvantage of

High labour cost & low heat economy
Non-uniform & low production rate
All of the listed here
High maintenance cost

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