Adjustment of models and effective diffusivity in the drying of Azadirachta indica A. Juss. leaves

Vitor Marques Vidal; Osvaldo Resende; Jaqueline Ferreira Vieira Bessa; Wilker Alves Morais; Lilian Abadia Silva; Zirvaldo Zenid Virgolino

2016, Number 4

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Rev Cubana Plant Med 2016; 21 (4)

**Adjustment of models and effective diffusivity in the drying of Azadirachta indica A. Juss. leaves**

Marques VV, Resende O, Ferreira VBJ, Alves MW, Abadia SL, Zenid VZ

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Language: Portugués
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ABSTRACT

Introduction: The species Azadirachta indica A. Juss, commonly known as Indian neen, is broadly used in medicine, agriculture and the cosmetic industry, mainly in the form of dehydrated leaves. Due to the importance of this species, specific knowledge is required for its preprocessing.
Objective: Determine the drying curve, adjust non-linear models to the data, and estimate the effective diffusivity and activation energy coefficient during the drying of A. indica leaves at different temperatures.
Methods: Leaves from the study species were dried at different temperatures with four replications in the fixed layer dryer. Twelve models were used to test the behavior of the drying kinetics. These were selected from among those providing better functional responses, bearing in mind the magnitude of the determination coefficient, chi-square, relative mean error and typical deviation. Additionally, data were adjusted to the liquid diffusion mathematical model with the analytical solution for the infinite plane plate with an approximation of 8 terms. The charts were developed by Sigma Plot.
Results: A satisfactory adjustment was achieved for the models Verma, Newton, Midilli, logarithmic, and diffusion approximation, but the Newton model was chosen, due to the simplicity of its application. It was found that as temperature increases, there is a decrease in drying time and an increase in water transport intensity.
Conclusions: Activation energy was 27.77 kJ mol-1. The Newton model may be used to describe the drying kinetics of A. indica leaves. Activation energy was within the scope established for agricultural products.

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