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Saturation moisture balance equation

The moisture balance equation for water saturation S(r,t) in the radial case for the annular region between canister wall (r = ) and rock (r,) reads... [Pg.336]

Equation 4.16 indicates that the feed rate of wet solids must be below that which would result in saturation of the exhaust air stream. Failure to satisfy the moisture balance leads to wet quenching of the bed (see Chapter 5). [Pg.122]

The basic assumption for a mass transport limited model is that diffusion of water vapor thorugh air provides the major resistance to moisture sorption on hygroscopic materials. The boundary conditions for the mass transport limited sorption model are that at the surface of the condensed film the partial pressure of water is given by the vapor pressure above a saturated solution of the salt (Ps) and at the edge of the diffusion boundary layer the vapor pressure is experimentally fixed to be Pc. The problem involves setting up a mass balance and solving the differential equation according to the boundary conditions (see Fig. 10). [Pg.715]

Equations for predicting constant-rate drying. Drying of a material occurs by mass transfer of water vapor from the saturated surface of the material through an air film to the bulk gas phase or environment. The rate of moisture movement within the solid is sufficient to keep the surface saturated. The rate of removal of the water vapor (drying) is controlled by the rate of heat transfer to the evaporating surface, which furnishes the latent heat of evaporation for the liquid. At steady state, the rate of mass transfer balances the rate ofheat transfer. [Pg.542]


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