Modeling some drying characteristics of garlic sheets under semi fluidized and fluidized bed conditions
2012
Amiri Chayjan, R. | Salari, K. | Shadidi, B.
Thin layer drying properties of high moisture garlic sheets under semi fluidized and fluidized bed conditions with high initial moisture content (about 154.26% d.b.) were studied. Air temperatures of 50, 60, 70 and 80°C were applied to garlic samples. Among the applied models, Page model was the best to predict the thin layer drying behavior of garlic sheets. Using this model, correlation coefficient (R<sup>2</sup>) was high for all drying cases. The computed values of D<sub>eff</sub> were between 3.38 × 10<sup>–10</sup> and 2.54 × 10<sup>–9</sup> m<sup>2</sup>/s during the falling rate drying. Values of D<sub>eff</sub> for garlic sheets were also increased with increasing in input air temperature. Activation energy values were varied between 51.32 and 60.58 kJ/mol for 50 to 80°C, respectively. The specific energy consumption (SEC) for garlic specimens was placed in the range of 0.316 × 10<sup>6</sup> and 0.979 × 10<sup>6</sup> kJ/kg from 50 to 80°C, respectively. An increase in air temperature caused decrease in SEC value. Application of semi fluidized bed convective drying with temperature between 50 and 60°C was suitable to produce dried garlic.
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