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Mass Transfer - Engineering

Q1:

Flights in a rotary dryer are provided to

A lift and shower the solids thus exposing it thoroughly to the drying action of the gas.

B reduce the residence time of solid.

C increase the residence time of the solid.

D none of these.

ANS:A - lift and shower the solids thus exposing it thoroughly to the drying action of the gas.

Flights in a rotary dryer serve to lift and shower the solids as they tumble within the dryer drum. This action exposes the solid material to the drying gas more thoroughly, facilitating efficient heat and mass transfer. Consequently, the primary purpose of flights in a rotary dryer is to enhance the drying process by increasing the contact between the solids and the drying medium. Therefore, the correct option is:

  • Flights in a rotary dryer are provided to lift and shower the solids thus exposing it thoroughly to the drying action of the gas.