Diffusion of moisture from a ball of clay.A spherical ball of clay, 2 inches in diameter, has an initial moisture content of 10 wt%. The diffusivity of water in the clay is 5x10-6 cm2/s. At time t = 0, the clay surface is brought into contact with air, and the moisture content at the surface is maintained at 3wt%. Estimate the time for the average sphere moisture content to drop to 5 wt%. All moisture contents are on a dry basis.

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Convective Mass Transfer between Phases

Mass transfer means the transport or movement of mass using streams, phases, components, and so on from one location to another.