Abstract: This study was
performed to determine the most appropriate thin layer drying model and the
effective moisture diffusivity of Roselle (Hibiscus sabdariffa) using
recirculated tray dryer. Rosella dried using recirculated tray dryer at
temperatures of 40, 50 and 60ºC. The drying data were fitted to eleven thin
layer models and a thin layer model for the roselle calyx was developed by
regressing the coefficients of the best fit model. The newton model was most
adequate model for describing the thin layer drying kinetics of the roselle
calyx. The drying constant was found to vary linearly with temperature. Also,
effective diffusivity was evaluated by using Fick’s second law, which varied
from 1.405 x 10-10 to 2.283 x 10-10 m2/s. The
dependence of moisture diffusivity on temperature was described by Arrhenius
type equation. The activation energy for moisture diffusion during drying was
21.02 kJ/gmol.
Keywords: Activation energy,
diffusivity, drying, roselle, thin layer drying
Penulis: Rustam Santiko
Nugroho, S Suherman
Kode Jurnal: jpkimiadd120063
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