Mass Transfer
Flights in a rotary dryer are provided to

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

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Mass Transfer
Steam distillation is not recommended to be used, if the

Liquids decompose, if distilled directly at atmospheric pressure
Material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature
Material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature
Azeotropic mixture is to be separated and the final product is miscible with water

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