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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 ∝ D
K ∝ D1.5

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Mass Transfer
Under conditions of flooding in packed tower, the gas pressure drop

Remains constant
Is maximum
Increases rapidly
Decreases rapidly

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Mass Transfer
The main reason for dividing a tall packed tower into series of small towers is to

Avoid flooding
Avoid channeling
Reduce liquid hold up
Minimise the overall pressure drop

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Mass Transfer
If the specific heats of a gas and a vapor are 0.2KJ/Kg.°K and 1.5 KJ/Kg.°K respectively, and the humidity is 0.01; the humid heat in KJ/°Kg. is

0.017
0.107
0.31
0.215

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Mass Transfer
The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is

Induced draft cooling tower
Natural draft cooling tower
Spray chamber
None of these

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Mass Transfer
Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are

8
1
9
10

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