Calculation Methods for Falling-Rate Drying Period

7 CALCULATION METHODS FOR FALLING-RATE DRYING PERIOD 

In the falling-rate drying period as shown in Fig. 9.5-lb, the rate of drying R is not constant but decreases when drying proceeds past the critical free moisture content When the free moisture content X is zero, the rate drops to zero. 

The time for drying for any region between and ATj has been given by Eq. (9.6-1). 

Solution From Fig. 9.5-lb, the critical free moisture content isATc = 0.195 kg H20/kg dry solid. Hence, the drying is in the constant-rate and falling-rate periods. 

7 Calculation Methods for Falling-Rate Drying Period 

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Sec. 9.7 Calculation Methods for Falling-Rate Drying Period... 

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