Resumo

SALCEDO MENDOZA, Jairo et al. Drying kinetics of cassava (Manihot esculenta Crantz) variety CORPOICA M-tai depending on the temperature and air velocity. Rev. ion [online]. 2014, vol.27, n.2, pp.29-42. ISSN 0120-100X.

Drying cassava (Manihot esculenta Crantz) variety CORPOICA M-tai was performed in a dryer trays at laboratory scale. Samples of cassava with thickness of 0.2cm and 0.4cm diameter were placed on the dryer in direct contact with hot air under several operation conditions. The effect of temperature (35, 45 and 55°C) and air velocity (1.0, 2.0 and 3.0m/s) were studied on the drying time and effective diffusivity were assessed. The results showed that to the a temperature of 55°C and an air flow of 3.0m/s the drying time was of the 4.5h, reaching moisture 4.87% . Data obtained from the drying curves were adjusted to model Newton, Two exponential term, Wang and Singh, Modified Henderson and Pabis, and the Diffusion approximation. According to the results the mathematical model that best described the behavior of kinetic curves of drying was the diffusion Approximation model with a linear regression (0.958 ≤ R² ≤ 0.993). The effective diffusivity (Df) value varied between 1.26 x 10^-10 y 4.14. x 10^-10m²/s and the activation energy (Ea) varied between 33.66KJ/mol to 16.16KJ/mol.

Palavras-chave : cassava; curves of drying; drying time; kinetic models; effective diffusivity.

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