Mass Transfer
Flights in a rotary dryer are provided to

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

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Mass Transfer
Plate efficiency

Increases due to weeping and dumping of liquid
Is a function of the mass transfer between liquid and vapour
Increases due to foaming
Increases due to liquid entrainment

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