Abstract

MARTINES-LOPEZ, Enrique  and  LIRA-CORTES, Leonel. Evaluation of Influence Factors in Luikov Model During Drying of Red Brick. Ing. invest. y tecnol. [online]. 2016, vol.17, n.1, pp.35-44. ISSN 2594-0732.

The heat and moisture transfer in the drying of porous solid materials is important, since excessive moisture has adverse effects on these materials; then, it exist a wide interest on the reduction of moisture in them. Nowadays, the research of the drying process is carried out both theoretical, as experimentally, because does not exist a universal model which satisfactorily describe the drying process of all kind of solid materials. The developed models apply to restricted groups of materials. To describe the moisture transfer in capillary porous materials, one of the more accepted theoretical models is the Luikov model, which is derived from the principles of thermodynamics of irreversible processes. This model has been applied to many materials; however, to describe the moisture transfer in capillary porous materials, it is needed a comprehensive analysis to identify the thermophysical properties which have major influence in the drying profiles. Also, it is needed to validate the model for those materials in which the model is applied. In this work, the solution of Luikov model (as obtained by Liu et al., 1991) was used to obtain moisture profiles during the drying of brick at different temperatures. Also, an evaluation of the influence factors which affects to the obtained moisture profiles was carried out. It was found that one of the most important mechanisms which control the drying process is the diffusion of moisture. Also, the experimental validation using brick was performed at temperatures of 60 and 80°C; the theoretical and experimental results agree in the falling rate period, which is useful in the moisture content determination.

Keywords : Luikov model; moisture potential; drying; influence factors; brick.

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