Abstract
An experimental and a theoretical study of the heat and mass transfer mechanism, and of the mechanical behaviour which occur during convective drying of clay material are reported.The model is valid only for biphasic media and it describes the critical first stage of the drying process where the material is exposed to shrinkage which may lead to large deformations and cracks. Some essential physico-chemical properties of three variety of clay are determined by experimental investigations.To check the validity of the mathematical model, drying experiments were carried out at different conditions of temperature, air velocity and relative humidity. Representative drying curves as well as moisture and temperature profiles are presented and discussed. Comparison between predicted and experimental results provides satisfactory agreement for this model. Displacement and stress fields using the elastic behaviour of the material are also presented and commented.
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