عنوان مقاله [English]
In the present study, a microwave-hot air dryer with microwave power density control was developed for banana drying. This dryer was consisted of the online mass measurement, imagining, and microwave power control circuit systems. The microwave power control system was set with an Arduino board, SSR relay, and control program in MATLAB. Experiments with five levels of fixed power density (4, 5, 6, 7, and 8 Wg-1) were done for examining the kinetics of moisture content and microwave power variation during the drying process. For modeling of moisture content kinetics, seven mathematical models were nominated. Results showed that the Logarithmic model could predict the drying kinetics of banana slices better than the other models with the highest R2 and lowest RMSE . The quality evaluation demonstrated that clear bringing of banana slices was happened with 6, 7, and 8 power density compared to the 4 and 5 power density.