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Mass Transfer

Mass Transfer
Gaseous diffusivity at atmospheric pressure is of the order of __________ cm²/second.

1 to 5
5 to 10
1
> 10

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Mass Transfer
Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid )

P >>P
P = P
P
P < P

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Mass Transfer
An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively.The humidity of air sample expressed as kg of water vapour/kg of dry air is

0.122
0.048
0.079
0.152

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

1
0.1
0.01
10

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Mass Transfer
During constant rate drying period, vaporisation rate per unit drying surface area

Does not change with time
Decreases with time
Increases with time
Does not affect the moisture content of the wet solid

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Mass Transfer
Lewis number (Le) is

Sh x Pr
Pr x St
St x Sh
Sc x Pr

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