Transferência de calor e massa no interior de sólidos com forma esferoidal prolata via termodinâmica dos processos irreversíveis.

Abstract

A great number of studies have been led to analyze the phenomenon of transfer of heat and mass during the drying process. Some authors consider the external conditions of the air on the process, while others consider the internal conditions to the solid with emphasis to the mechanisms of humidity movement and your effects on the same. Due to your great importance, numerous mathematical models have been proposed to describe the humidity loss and heating of the solid during the drying, however few are the works that incorporate the simultaneous phenomena of transport heat and mass (I liquid and vapor) applied to solids ellipsoid. In this sense, this work has as objective develops mathematical models for the description of the changes of energy and mass during the drying process, in bodies with geometry prolate spheroidal, based on the thermodynamics of the irreversible processes. All the equations differentiate rulers they are written in the system of coordinate's prolate spheroid o and solved numerical through numeric method of the finite volumes. As application the methodology was used to describe the drying of wheat grain. Results of the humidity tenor, temperature, liquid flow and vapor during the drying process were found. Analyses are presented on the effects of the shrink and of the coefficients of transports Ji; Jv and hm. The obtained results are consistent and the presented model can be used to solve problems of transfer of heat and mass (liquid and vapor) simultaneous in agricultural products with the high humidity tenor, as well as geometry that varies from a circular disk to a sphere, including the prolate spheroidal.