ABSTRACT: The effects of different microwave power density (P/m) on water ratio MR, water loss rate and drying time of longan pulp during drying were studied. The results showed that the microwave drying equipment of longan pulp was a slow drying process controlled by internal moisture diffusion.
Seven common food thin-layer drying models were used to fit the experimental data nonlinearly. By comparing the determination coefficient R2, root mean square error RMSE and chi square 2, the results showed that Midilli model was the best model for describing longan pulp microwave drying. The results show that the effective diffusion coefficient Deff increases with the increase of microwave power density. The value of Deff is between 0.7057 *10-9~1.8 *10-9 m2/s and the average activation energy is 1.266 W/g.
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