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Abstract
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The effect of different drying conditions on the effective moisture diffusivity, activation energy, specific energy, shrinkage, rupture force and energy, and color of terebinth was studied. Experiments were conducted at five levels of hot air velocity (0.8, 1.35, 2.08, 3.35 and 4.43 m/s) and five temperature levels (40, 50, 60, 70 and 80C). The obtained effective moisture diffusivity of terebinth ranged between 1.1 ¥ 10-10 and 1.26 ¥ 10-9 m2/s and the calculated activation energy of the samples was 49.99–51.22 kJ/mol. Results showed that the Logestic model with R2 = 0.9994, c2 = 0.00177 and RMSE = 0.0318 had the best performance in moisture prediction. Maximum shrinkage during drying was calculated to be 72.2% at air temperature of 80C and air velocity of 4.43 m/s. Maximum rupture force and energy for dried terebinth were calculated to be 135.6 N and 2,509.6 N·mm, respectively. Most color (DRGB) changes were obtained at air temperature of 80C and air velocity of 4.43 m/s.
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