Question: A wet, clay brick measuring 2 4 6 in. has an initial uniform moisture content of 12 wt%..At time = 0, the brick

A wet, clay brick measuring 2 × 4 × 6 in. has an initial uniform moisture content of 12 wt%..At time = 0, the brick is exposed on all sides to .air such that the surface moisture content is maintained at 2 wt%. After 5 h, the average moisture content is 8 wt%. Estimate:
(a) The diffusivity of water in the clay in cm2/s.
(b) The additional time for the average moisture content to reach 4 wt%. All moisture contents are on a dry basis.

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a By definition in Eq 380 the unaccomplished fractional moisture concentration change after 5 hours ... View full answer

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