Mass Transfer
Flights in a rotary dryer are provided to

Increase the residence time of the solid
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

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Mass Transfer
In case of absorption with exothermic reaction, for fluids having

Pr = Sc ; there won
Pr = Sc = 1; total mass, momentum and thermal diffusivity will be the same
Both A & B
Pr = Sc; percentage change in heat and mass transfer flux will be the same for a given change in the degree of turbulence

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