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Revista Brasileira de Plantas Medicinais

Print version ISSN 1516-0572


OLIVEIRA, M.T.R.; BERBERT, P.A.  and  MARTINAZZO, A.P.. Assessment of mathematical models for the description of Pectis brevipedunculata (Gardner) Sch. Bip. convective drying curves. Rev. bras. plantas med. [online]. 2013, vol.15, n.1, pp.1-12. ISSN 1516-0572.

The aim of this study was to select, among five mathematical models, the one that best describes the experimental drying curves of the shoot of P. brevipedunculata. Tests were conducted in a thin-layer prototype laboratory drier, at 30, 40 and 50°C, employing a dry air mass flow rate of 0.274 and 0.542 kg s-1 m-2. The goodness of fit of the models was assessed based on correlation coefficient, root mean square error, mean absolute percentage error, reduced chi-squared, residual plot analysis, and taking into account the principle of parsimony. The model that best described the experimental drying curves was the simple-exponential, three-parameter model, which can be safely used to simulate the deep-bed process. Although the Lewis model was found not to produce accurate predictions of the drying curves, an Arrhenius-type equation represents the relationship between the drying constant k and the temperature.

Keywords : essential oil; drying simulation; Lewis model; Arrhenius equation.

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