New thin-layer drying models for the design and simulation of cassava root dryers and phenomenological study of interaction water-starch during diffusion

Colón W., . and Parra J., . and Ferrer A., . and Angós I., . and Faneite A. M., . and Argüello G., . New thin-layer drying models for the design and simulation of cassava root dryers and phenomenological study of interaction water-starch during diffusion. pp. 182-196. ISSN 2231-7546

In the present work drying phenomenology of cassava root slices was studied at 55 65 75 85 95 105 and 115C and at 5- and 6-mm thicknesses. Chemical analysis X-ray diffraction (XRD) measurements and Fourier-Transform Infrared Spectroscopy (FTIR) of samples of cassava dried at different temperatures were carried out. Additionally the performance of three new thin-layer drying kinetics models was analysed. Initial moisture in a wet basis and starch content in a dry basis were 62.4 and 74.8 respectively. The drying curves showed a monotonic decrease in time and a progressive closeness as the drying temperature increased (with the exception of 115C) reaching a stage so-called dynamic pseudo-equilibrium located between the typical storage moisture content and the real equilibrium. Drying rate curves showed a single stage of decreasing drying rate with internal control while desorption curves showed a sigmoidal characteristic shape of an anomalous diffusion type confirmed by the potential behaviour of the effective diffusivity with respect to the material moisture content. The 115C drying curve behaviour was explained by the changes seen in XRD patterns and FTIR spectra. The new Modified-Faneite-Su¡rez model got an extraordinary performance modelling the cassava drying while Faneite-Mosquera model got a very good performance and the most recommendable to be used in design and simulation of cassava dryers based on its sound theoretical basis and prediction capabilities in a broad spectrum of temperatures.

Full text available from: Official URL: http://www.ifrj.upm.edu.my/27%20(01)%202020/19%20-...

Abstract

In the present work drying phenomenology of cassava root slices was studied at 55 65 75 85 95 105 and 115C and at 5- and 6-mm thicknesses. Chemical analysis X-ray diffraction (XRD) measurements and Fourier-Transform Infrared Spectroscopy (FTIR) of samples of cassava dried at different temperatures were carried out. Additionally the performance of three new thin-layer drying kinetics models was analysed. Initial moisture in a wet basis and starch content in a dry basis were 62.4 and 74.8 respectively. The drying curves showed a monotonic decrease in time and a progressive closeness as the drying temperature increased (with the exception of 115C) reaching a stage so-called dynamic pseudo-equilibrium located between the typical storage moisture content and the real equilibrium. Drying rate curves showed a single stage of decreasing drying rate with internal control while desorption curves showed a sigmoidal characteristic shape of an anomalous diffusion type confirmed by the potential behaviour of the effective diffusivity with respect to the material moisture content. The 115C drying curve behaviour was explained by the changes seen in XRD patterns and FTIR spectra. The new Modified-Faneite-Su¡rez model got an extraordinary performance modelling the cassava drying while Faneite-Mosquera model got a very good performance and the most recommendable to be used in design and simulation of cassava dryers based on its sound theoretical basis and prediction capabilities in a broad spectrum of temperatures.

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Item Type:	Article
AGROVOC Term:	Cassava
AGROVOC Term:	Roots
AGROVOC Term:	Manihot esculenta
AGROVOC Term:	Starch
AGROVOC Term:	Diffusion
AGROVOC Term:	Desorption
AGROVOC Term:	Chemical analysis (methods)
AGROVOC Term:	Laboratory experimentation
AGROVOC Term:	Analysis of variance
AGROVOC Term:	Drying
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/8985

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