Secagem de materiais cerâmicos com forma complexa: um estudo teórico via CFX.

Abstract

Several authors has studied the phenomenon of heat and mass transfer during the drying process. Numerous mathematical models have been proposed to describe the heating of Ceramic Materials and moisture loss during drying.In this sense, this work has as general objective to study the transfer of heat and mass in ceramic materials with complex form, using the CFX. A three-dimensional transient mathematical model is presented to predict the transfer of mass and heat and to simulate the distribution of moisture and temperature content within ceramic solids, considering constant thermophysical properties using ANSYS CFX® software. For the validation of the numerical methodology, experimental data from the literature on the drying of ceramic tubes at 60, 70, 80, 90 and 100 ° C drying temperatures were used. Results of the moisture content and temperature of the ceramic material during drying are presented and compared with the experimental data, and a good approximation was verified from this comparison, the mass diffusion coefficient was estimated for each drying temperature. It has been observed that in the drying process the mass loss is slower than heating, since the thermal conductivity of the material is much greater than mass diffusion. It is found that the coefficient of mass diffusion tends to increase with the increase of the drying temperature.