Mass Transfer
Flights in a rotary dryer are provided to

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

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Mass Transfer
Channelling is most severe

In towers packed randomly with crushed solids
In dumped packing of regular units
In towers packed with stacked packing
At very high liquid flow rate

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