Communications about 0.35. In the range of higher humidities (capillary condensation) the GAB model agrees better with the experimental results.
ConclusionsThe process of product drying and the change of the adsorbent moisture content can simply be investigated with the help of the rotating drum.The determination of the water vapor adsorption isotherms both for the products to be dried and the adsorbents is essential for the establishment of a physically based mathematical modeling of adsorption drying. For determining the adsorption equilibria the proven desiccator method and modern equipment (sorption analyzer) are available. For the mathematical description of the adsorption isotherms of the products investigated the GAB equation has proven to be very suitable.This means that there are good conditions for the process development and modeling of drying processes with adsorbents at low temperatures also below the freezing point. It also includes atmospheric fluidized bed freeze drying (e.g., [6±9]).
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