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Mass Transfer

Mass Transfer
Mechanism of moisture removal in case of freeze drying of food stuff is by

Evaporation
Dehydration
Sublimation
Adsorption

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Mass Transfer
For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of Hâ‚‚/ky.Cz is around

0.72
1
0.24
0.6

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Mass Transfer
Low viscosity absorbent is preferred for reasons of

Improved flooding characteristics
All of these
Rapid absorption rates and good heat transfer characteristics
Low pressure drop on pumping

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Mass Transfer
Solvent used in extractive distillation

Forms a low boiling azeotrope
Is of low volatility
Does not alter the relative volatility of the original components
Forms a high boiling azeotrope

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Mass Transfer
Minimum possible diameter of a packed coloumn is decided mainly by the

Gas viscosity
Flooding
Liquid density
Liquid hold up

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Mass Transfer
Gaseous diffusion co-efficient increases with increase in the

None of the listed here
Both Pressure & Temperature
Temperature
Pressure

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