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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Mass Transfer
McCabe-Thiele method

Uses weight fractions to express liquid and vapour composition
Can use any type of units
Uses molal units for material and energy balance
Is more accurate than Ponchan-Savarit method

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