The present work aimed at studying the influences of temperature and pretreatment solution on drying of quince slices. Before drying, quince slices were treated with citric acid (SA) and sodium methabisulfite solutions (SMBS) and then dried at different temperatures (45, 55, 65 and 75˚C). In addition, a group of quince slices were dried without any solution that Control group. The drying time of quince slices decreased with pretreatment solution for all temperatures. Also, according to the results obtained, it showed that the air temperature has an effect on drying. Influence of the drying temperature on the process, it was observed that increasing the drying temperature from 45 to 75˚C leads to a diminishing of 61.5% in the drying time. The rate of quince slices drying is explained by the absence of the constant drying-rate period followed by falling-rate period, regardless of the conditions. Eight thin-layer drying models were used to fit the temporal distributions of the moisture data using non-linear regression analysis. The Midilli & Kücük model was determined as the suitable model with the highest R2 and lowest P, χ2 and RMSE values for the drying process. For the range of the drying temperatures examined, Fick's second law of diffusion was used to determine the effective moisture diffusivity, which varied between 3.33810-10 m²/s and 1.11610-9 m2/s. The values of activation energy were estimated by using an Arrhenius type equation. Calculated activation energy values are 31.82, 31.48 and 27.84 kJ/mol in SA, SMBS and Control samples, respectively. ORCID NO: 0000-0003-1771-5355
Anahtar Kelimeler: Activation Energy, Effective Moisture Diffusivity, Hot Air Drying, Mathematical Modeling, Quince Slices
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