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Abstract
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Article Information:
Thin Layer Drying Kinetics of of Roselle
Suherman, B. Fajar, H. Satriadi, O. Yuariski, R.S. Nugroho and A. Shobib
Corresponding Author: Suherman
Submitted: 2011 December, 23
Accepted: 2011 January, 16
Published: 2012 February, 15 |
Abstract:
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This study was performed to determine the most appropriate thin layer drying model and the
effective moisture diffusivity of Roselle (Hibiscus sabdariffa). Roselle with an Initial Moisture Content (IMC)
of 85%, on wet basis (wb) was dried in a conventional 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 diffusivity constant D0 activation energy Ea could be, respectively, estimated as 4.5 x 10-7
m2/s and 21.02 kJ/gmol.
Key words: Activation energy, diffusivity, drying, moisture ratio, roselle, thin layer drying,
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Cite this Reference:
Suherman, B. Fajar, H. Satriadi, O. Yuariski, R.S. Nugroho and A. Shobib, . Thin Layer Drying Kinetics of of Roselle. Advance Journal of Food Science and Technology, (1): 51-55.
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ISSN (Online): 2042-4876
ISSN (Print): 2042-4868 |
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