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Mass Transfer

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

7
150
70
0.7

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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

0.152
0.079
0.122
0.048

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Mass Transfer
According to Poiseuille's law, the permeability for gas flow through a capillary is proportional to (where, μ = gas viscosity)

μ
1/μ
μ²
√μ

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Mass Transfer
For __________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same.

Neither A nor B
Unsaturated surface
Constant rate
Both A & B

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Mass Transfer
For gas absorption, low viscosity solvents are preferred, because of their

Low pumping pressure drop
Better flow characteristics
Rapid absorption rates
All of these

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Mass Transfer
The equipment used in the extraction of highly corrosive radio active liquids is

Mixer settler
Spray column
Baffle tower
Pulse column

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