A solid is being dried in the linear drying rate regime from moisture content Xo to XF. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture Xo. The drying time for M = (Ls/ARc) is (where, L = total mass of dry solid, A = total surface area for drying Rc = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids)) ?

Question

Accepted Answer

MXo ln(Xo/XF). The drying time in the linear rate regime is proportional to the initial moisture content multiplied by the natural logarithm of the ratio of initial to final moisture contents.