Modeling some drying characteristics of garlic sheets under semi fluidized and fluidized bed conditions
2012
Amiri Chayjan, R., Bu-Ali Sina Univ., Hamadan (Iran Islamic Republic). Dept. of Agricultural Machinery Engineering | Salari, K., Bu-Ali Sina Univ., Hamadan (Iran Islamic Republic). Dept. of Agricultural Machinery Engineering | Shadidi, B., Bu-Ali Sina Univ., Hamadan (Iran Islamic Republic). Dept. of Agricultural Machinery Engineering
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 deg C were applied to garlic samples. Among the applied models, Page model was the best to predict the thin layer drying behaviour of garlic sheets. Using this model, the correlation coefficient was high for all drying cases. The computed values of Deff were between 3.38 x 10**-10 and 2.54 x 10**-9 square m/s during the falling rate drying. Values of Deff for garlic sheets increased with increasing input air temperature. Activation energy values varied between 51.32 and 60.58 kJ/mol for 50 to 80 deg C, respectively. The specific energy consumption (SEC) for garlic specimens ranged between 0.316 x 10**6 and 0.979 x 10**6 kJ/kg from 50 to 80 deg C, respectively. An increase in air temperature caused a decrease in SEC value. Application of semi fluidized bed convective drying with temperature between 50 and 60 deg C was suitable to produce dried garlic.
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