Mass Transfer
Blowdown in a cooling tower

Increases the scale forming tendencies of water
Is undesirable
Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities
All of these

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Mass Transfer
Flights in a rotary dryer are provided to

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

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