Question

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))

a.

M(Xo - XF)

b.

M(Xo/XF)

c.

M ln(Xo/XF)

d.

MXo ln(Xo/XF)

Answer: (d).MXo ln(Xo/XF)

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Q. 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...

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