Mass Transfer
Humidification involves mass transfer between a pure liquid phase and a fixed gas, which is

Insoluble in the liquid
Non-ideal in nature
Soluble in the liquid
At a fixed temperature

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Mass Transfer
Flights in a rotary dryer are provided to

None of these
Lift and shower the solids thus exposing it thoroughly to the drying action of the gas
Reduce the residence time of solid
Increase the residence time of the solid

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