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A material was dried in a tray-type batch dryer using constant-drying conditions. When the initial free...

A material was dried in a tray-type batch dryer using constant-drying conditions. When the initial free moisture content was 0.28 kg free moisture/kg dry solid, 6.0 h was required to dry the material to a free moisture content of 0.08 kg free moisture/kg dry solid. The critical free moisture content is 0.14. Assuming a drying rate in the falling-rate region, where the rate is a straight line from the critical point to the origin, predict the time to dry a sample from a free moisture content of 0.33 to 0.04 kg free moisture/kg dry solid. (Hint: First use the analytical equations for the constant-rate and the linear falling-rate periods with the known total time of 6.- h. Then use the same equations for the new conditions.)

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queen_honey_blossom answered 2 years ago
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