In the constant rate period of the rate of drying curve for batch drying,_________________?
Correct answer: B. Surface evaporation of unbound moisture occurs
- A. Cracks develop on the surface of the solid
- B. Surface evaporation of unbound moisture occurs
- C. Rate of drying decreases abruptly
- D. None of these
Explanation
During the constant-rate period, the exposed surface remains saturated with unbound moisture, so evaporation occurs at an essentially steady rate. Surface cracking and an abrupt rate decrease are associated with later falling-rate behaviour.
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