Discussion
A deep bed of \( 1.2 \) m depth is dried in \( 18 \) hours. Halving the depth, with the same air flow per unit area, would take approximately
Answer: D
With the same specific air flow the drying front travels at the same speed, so half the depth takes about half the time. The uniformity also improves, since the top layer sees air that has passed through less material.
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