Discussion
Arrange the periods of a typical drying curve in order:
1. Constant rate period at the wet bulb temperature
2. Initial adjustment as the product warms to the wet bulb temperature
3. Approach to the equilibrium moisture content
4. Falling rate period controlled by internal diffusion
Select the correct sequence.
Answer: C
Correct answer: 2, 1, 4, 3
The curve runs in this order. First an initial adjustment (2), in which the product warms - or cools - from its starting temperature until it reaches the wet bulb temperature of the air. Then the constant rate period (1), lasting as long as free water covers the surface and holding the product at the wet bulb temperature.
At the critical moisture the surface can no longer be kept wet, and the falling rate period (4) begins, now controlled by internal diffusion rather than by the air. Finally the rate tails away as the moisture approaches equilibrium with the air (3), which is the floor drying cannot pass.
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