摘要：In this work, a moisture dependent phase change criterion was considered in Luikov´s heat and mass transfer equations and the drying process of a biological product was investigated. Laboratory experiments were conducted to measure the temperature and the moisture content of sweet potato samples during drying. A finite element formulation was used to solve the coupled system of equations. The inverse problem methodology was applied to estimate the parameters of the proposed functional relationship by minimizing the deviation of experimental data and numerical predictions. Numerical simulation showed good agreement with the measured temperature and moisture values. By including a variable phase change criterion it was possible to reproduce the trends of behaviour of temperatures profiles during drying of sweet potato, suggesting that evaporation inside the sample depends on the local moisture content.
其他摘要：In this work, a moisture dependent phase change criterion was considered in Luikov´s heat and mass transfer equations and the drying process of a biological product was investigated. Laboratory experiments were conducted to measure the temperature and the moisture content of sweet potato samples during drying. A finite element formulation was used to solve the coupled system of equations. The inverse problem methodology was applied to estimate the parameters of the proposed functional relationship by minimizing the deviation of experimental data and numerical predictions. Numerical simulation showed good agreement with the measured temperature and moisture values. By including a variable phase change criterion it was possible to reproduce the trends of behaviour of temperatures profiles during drying of sweet potato, suggesting that evaporation inside the sample depends on the local moisture content.
