Discussion
During the falling rate period, drying is controlled principally by
Answer: A
Correct answer: Movement of moisture within the solid
In the falling rate period the surface is no longer continuously wet, so the rate is set by how quickly moisture can reach the surface from inside - by liquid diffusion, capillary flow or vapour movement through the pores. The rate falls as the remaining moisture has further to travel and is more firmly held.
This is why raising the air velocity, which is effective during the constant rate period, gives little benefit here: the bottleneck is inside the solid, not in the boundary layer. Reducing the particle or layer thickness helps far more, since it shortens the internal path.
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