The behavior of condensed water on the surface of a spherical porous material by direct contact condensation in the early stage of superheated steam/high humid hot air drying was investigated experimentally. A spherical brick was used as the sample porous material. The changes in the mass and surface and core temperatures of the material during drying were measured at various dry- and wet-bulb temperatures of the drying media, and various initial moisture contents of the material. From the experimental result, it was observed that the amount of condensate increased with a decrease in the dry-bulb temperature at high wet-bulb temperature or an increase in the wet-bulb temperature. The amount of one drop of condensate decreased at high wet-bulb temperature. Furthermore, when the initial moisture content of material was slightly lower than the maximum moisture content of the material, the total amount of drops was increased.
