Discussion
A drum dryer dries a liquid or slurry by
Answer: C
Correct answer: Spreading a film on a heated drum
A drum dryer applies a thin film of liquid or slurry to the surface of an internally steam-heated rotating drum. The film dries by conduction as the drum turns, and a doctor blade scrapes off the dried sheet, which is then broken into flakes or powder.
It suits pastes and slurries too viscous to atomise, and it is thermally efficient because heat passes directly into the film. Atomising into hot air describes a spray dryer, freezing and subliming describes a freeze dryer, and blowing air through a bed describes a fluidised or deep bed dryer.
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