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Drying process is one of the intensive energy operations in many industries such as tile and clay brick manufacturing industries. Cracking as a result of non-uniform deformation is one of defects that may occur during drying making the dried products useless. Intermittent drying is an effective strategy for improving the drying kinetics and the quality of the dried parts. Proper selection of intermittent drying parameters including the period, amplitude and the start time of variation are the main challenge in the drying. The purpose of this paper is to examine the effect of the period of temperature variation on the drying kinetics and induced stresses in the intermittent drying of clay like material. 3D modeling and simulation of continues and intermittent drying has been done by using finite element method. Moisture and thermal stresses are compared with each other. The good agreement between experiments and the simulation results revealed that the model developed is valid and accurate. Simulation results show that the stresses induced by drying heavily influenced by the frequency of variation. The change of the Frequency variations depending on the material properties and sample dimensions can decrease/increase the drying induced stresses. Intermittent drying has a different effect on the different points of the samples. Hence, the points susceptible to crack formation must be investigated simultaneously. The thermal stresses are negligible compared to the moisture stresses and can be neglected in drying modeling.

Keywords: Intermittent drying, period, drying stress, drying kinetic

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