Question

) A brick of clay is being dried in a batch dryer using constant drying conditions. You have been asked to determine the amount of time it will take to dry the clay from a total moisture content of 0.6 to a free moisture content of 0.08. You are given the following information: 1. Previously, the drier was able to dry a piece of clay with a total moisture content of 0.64 in 8 hours and 80% of the drying occurred with a constant rate. 2. The equilibrium moisture content is 0.1. 3. The critical free moisture content is 0.15.

Answer 1

Answer:

The drying time is calculated as shown

Explanation:

Data:

Let the moisture content be = 0.6

the free moisture content be = 0.08

total moisture of the clay  = 0.64

total drying time for the period = 8 hrs

then if the final dry and wet masses are calculated, it follows that

t = (X0+ Xc)/Rc) + (Xc/Rc)* ln (Xc/X)

 = 31.3 min.