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Ten thousand lb/h of wet sand at 70°F with a moisture content of 20% (dry basis) is to be dried to a moisture content of 5% (dry basis) in a continuous, fluidized-bed dryer operating at a pressure of 1 atm in the freeboard region above the bed. The sand has a narrow size range, with an average particle size of 500 μm; a sphericity, ϕs, of 0.67; and a particle density of 2.6 g/cm³. When the sand bed is dry, its void fraction, ϵb, is 0.55. Fluidizing air will enter the bed at a temperature of