The initial moisture content and the equilibrium moisture of a granular paste material extruded into cylinders (diameter- 5.25 mm, length-20 mm) is 0.8 k? h2okg dry solid and 0.015 kg h20/kg dry solid respectively. the cylinders are packed on a screen to a depth of 65.8 mm. the true solid density is 1580 kg/m2. the bulk density of the dry solid in the bed is 650 kg/m3 air (wet bulb temperature 48c and humidity 0.06 kg h2o/ kg dry air) passes through the bed with a superficial velocity of o.75 m/s. the total critical moisture content is 0.60 kg h20/kg dry solid calculate (i) the time of drying for the constant-rate period (s), (ii) the time of drying for the falling-rate period (s) and (ii) the total time to dry the solids to 0.3 kg h20/kg dry solid (s).