For which one of the following situations would Kendall’s tau be appropriate? a) The Mohs scale rates the hardness of minerals. If one mineral can scratch another, it is judged….
Calculate the time for drying in this constant-rate period.
Through-Circulation Drying in the Constant-Rate Period. Spherical wet catalyst pellets having a diameter of 12.7 mm are being dried in a through-circulation dryer. The pellets are in a bed 63.5 mm thick on a screen. The solids are being dried by air entering with a superficial velocity of 0.914 m/s at 82.2°C and with a humidity H = 0.01 kg H2O/kg dry air. The dry-solid density is determined as 1522 kg/m3, and the void fraction in the bed is 0.35. The initial free moisture content is 0.90 kg H2O/kg solid and the solids are to be dried to a free moisture content of 0.45, which is above the critical free moisture content. Calculate the time for drying in this constant-rate period.