Discussion
A fluidised bed dryer suspends the particles in an upward air stream in order to
Answer: A
Correct answer: Achieve high, uniform transfer rates
Fluidising the bed suspends each particle in the air stream, so every surface is exposed to the drying air and the particles mix vigorously. Heat and mass transfer coefficients are therefore high and, just as importantly, uniform - there are no stagnant pockets and no steep gradient through the bed as there is in a deep static bed.
The price is a substantially higher air flow, since the velocity must exceed the minimum fluidisation velocity; it is not reduced. Air must still be heated, and although fluidisation does classify particles somewhat, that is a side effect and not the purpose.
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