The simultaneous diffusion and adsorption of water vapor into specially prepared silica gel and activated carbon desiccants was experimentally studied for laminar flow through an isothermally maintained parallel-plate channel. The equilibrium characteristics and tortuosities of the various desiccant sheets used were experimentally determined.
The data were compared with a modified Rosen model. The Rosen model predicts outlet concentrations from the knowledge of adsorption equilibrium constants, diffusion, and mass transfer coefficients. A comparison of computed and measured concentrations as a function of sorption time shows that with independently measured equilibrium and effective diffusion coefficients, the modified Rosen model became completely predictive.