A wetted non
-
porous solid with an initial dry mass of 1.5 g is dried under constant
drying conditions
in an air stream flowing at 0.85m/s. The area of surface drying is
55m
2
. (i)
If th
e initial rate of drying is 0.3 g/m
2
, how long will it take to dry the material from 0.15 to 0.025 kg water / kg dry solid? (7
marks)
(ii)
The critical moisture content of the material may be taken as 0.125 kg water / kg dry solid. If the air v
elocity were increased to 4.0 m/s, what would be the anticipated saving in time if the process were surface –
evaporation
-
controlled?
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not able to answer......sry
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