March 2003
Intermediate to advanced
1056 pages
32h 58m
English
book
Transport Processes and Separation Process Principles (Includes Unit Operations) Fourth Edition
by Christie John Geankoplis
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9.7. CALCULATION METHODS FOR FALLING-RATE DRYING PERIOD
9.7A. Method Using Numerical Integration
In the falling-rate drying period, as shown in Fig. 9.5-1b, the rate of drying R is not constant but decreases when drying proceeds past the critical free moisture content XC. When the free moisture content X is zero, the rate drops to zero.
The time of drying for any region between X1 and X2 has been given by Eq. (9.6-1):
Equation 9.6-1
If the rate is constant, Eq. (9.6-1) can be integrated to give Eq. (9.6-2). However, in the falling-rate period, R varies. For any shape of falling-rate drying curve, Eq. (9.6-1) can be integrated by plotting 1/
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