MATHEMATICAL MODELS TO DETERMINE OF THIN LAYER DRYING KINETIC OF GINGER SLICES

Abstract

In the present work, the effects of some parametric values on the thin layer drying process of ginger slices were investigated. Drying was done in the laboratory by using cyclone type convective dryer. The drying air temperature was varied as 40, 50, 60 and 70˚C70˚C and the air velocity is 0.8, 1.5 and 3 m/s. All drying experiments had only falling rate period. The drying data were fitted to the twelve mathematical models and performance of these models was investigated by comparing the determination of coefficient (R 2), reduced chi-square (χ 2) and root mean square error (RMSE) between the observed and predicted moisture ratios. Among these models, drying model developed by Midilli et al. model showed good agreement with the data obtained from the experiments. From the Midilli et al. model for ginger slices, R 2 ,  2 and RMSE were determined between 0.99587 and 0.99971, 0.0006156 and 0.00003721 and, 0.019792 and 0.005597, respectively. Using regression analysis, the relationship between the coefficients of Midilli et al. model with drying air temperature and velocity was investigated.