Abstract
The drying mechanism and the drying rate of porous solids in the usual hot air dryers have been widely analized, and also have been theoretically systematized. However, when the wet solids were dried in a fluidized bed making use of the fact that the heat-transfer coefficients between fluidized bed and solids were remarkably large, such unusual phenomena were found that the inner temperature dropped while drying. Such unusuality has never been expected from conventional theories of hot air dryer. In this report, the authors dried various solid spheres containing liquids in a fluidized bed, and tried to analize such unusual phenomena with application of the analytical method of drying rate previously presented by us.
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