effect of temperature, relative humidity and air on drying

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ISSN: 1579-4377 EFFECT OF TEMPERATURE, RELATIVE HUMIDITY AND AIR VELOCITY ONDRYING KINETICS AND DRYING RATE OF BASIL LEAVES Amin Taheri-Garavand*, Shahin Rafiee, Alireza Keyhani Department of Agricultural Machinery Engineering University of Tehran, Karaj, Iran. [email protected], ABSTRACT Thin-layer drying kinetics of basil leaves was experimentally investigated in a pilot scale convective dryer. The eff ects of temperature, relative humidity (RH) and air velocity on the drying kinetics were investigated to identify the optimal drying conditions for basil leaves. Experiments were performed at air temperatures of 40, 60, and 80ºC and at three relative humidity of 20%, 40% and 60% and air velocity of 1.5, 2 and 2.5 m/s. In order to select a suitable form of the drying curve, 9 diff erent thin layer drying models were fitted to experimental data. The high values of coefficient of determination and the low values of reduced sum square errors and root mean square error indicated that the Midilli et al. model could satisfactorily illustrate the drying curve of basil leaves. The Midilli et al. model had the highest value of R 2 , the lowest SSE and RMSE for different air drying donditions. The Midilli et al. model was found to satisfactorily describe the drying behavior of basil leaves. KEYWORDS Temperature, relative humidity, air velocity, drying, Midilli, basil leaves.

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