Mass Transfer
A slurry is to be dried to produce flaky solid. Which dryer would you recommend?

Spray dryer
Drum dryer
Dielectric dryer
Rotary dryer

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Mass Transfer
To get high tray efficiency

Liquid entrainment should be severe
Interfacial surface between liquid and gas phase should be large
Gas velocity should be very low
Time of contact between the two phases should be less

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