Abstract
The thin layer drying kinetics of pellets millet flour was studied at drying air temperatures of 40, 50 and 60°C using a constant air velocity of 1.0 m/s for pellets size 2.5 mm < d1 < 3.15 mm and 5 mm < d2 < 6.30 mm. Ten thin layer drying models were evaluated by fitting the experimental moisture data. The goodness of fit of each model was evaluated using the coefficient of determination (R2) the reduced chi-square () and root means square error (RMSE). Among these models, the modified Henderson and Pabis model is the best one to describe the behaviour in the drying of pellets millet. The effective diffusivity has been found to be varying between 4.4676 × 10-9 and 31.94 x 10-9 m2/s and activation energy was 33.048 and 42.658 kJ/mol for pellets size of d1 and d2 respectively. Key words: Thin layer drying, mathematical modelling, effective diffusivity, activation energy.
Highlights
IntroductionThere is a strong demand for grain products in both rural and urban areas
Cereals are the main food in Sahel countries
The thin layer drying kinetics of pellets millet flour was studied at drying air temperatures of 40, 50 and 60°C using a constant air velocity of 1.0 m/s for pellets size 2.5 mm < d1 < 3.15 mm and 5 mm < d2 < 6.30 mm
Summary
There is a strong demand for grain products in both rural and urban areas This sudden and unexpected interest for local cereals, once abandoned, is interesting in agriculture and agribusiness. In order to study the effects of the drying on the pellets millet it is necessary to have a deep knowledge of the mass transfer parameters and the drying kinetics. These characteristics are considered to be important for the design, simulation and optimization of the drying process by using mathematical modelling. The mathematical models have proved to be very useful in the new design and/or improvement of drying systems and analysis of mass transfer phenomena involved during drying (Akpinar et al, 2008)
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