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Mass Transfer

Mass Transfer
Surface renewal model of mass transfer was enunciated by

Fick
Stefan
Toor and Marchello
Danckwerts

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Mass Transfer
For the same system, if the same liquid used in an absorber is decreased, the tower height will

Increase
Decrease or increase ; depends on the type of liquid
Decrease
Remain unaffected

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Mass Transfer
Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and

None of these
Dehumidified
Humidified at constant wet bulb temperature
Humidified with wet bulb temperature decreasing

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Mass Transfer
The drying time between fixed moisture contents within the 'constant rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )

T
T3
√T
T1.5

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Mass Transfer
In distillation columns, the number of bubble caps per tray primarily depends upon the

Allowable gas and liquid velocities
Allowable liquid velocity
Feed composition
Allowable gas velocity

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Mass Transfer
If f = moles of vapour present per mole of feed, then the slope of feed line is

- f/(1 - f)
- (f - 1)/f
- 1/f
(1 - f)/f

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