Free-moisture content Drying rate
Slabs of filter cake with a bone-dry density of 1,600 kg/m3 are to be dried from an initial free-moisture content of 110% (dry basis) to a final free-moisture content of 5% (dry basis) batchwise in trays that are 1 m long by 0.5 m wide, with a depth of 3 cm. Drying will take place from the top surface only. The drying air conditions are 1 atm, 160oC, and a 60oC wet-bulb temperature. The air velocity across the trays is 3.5 m/s. Experiments under these drying conditions show a critical free-moisture content of 70% (dry basis), with a falling-rate period like that of Figure, based on free-moisture content. Determine: (a) drying time for the constant-rate period; (b) drying time for the falling-rate period.
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