Absrtact: The temperature and moisture content of potato dice dried at different microwave power (600, 900, 1200 and 1500W) were tested by a self-made microwave hot-air coupled drying system. The microwave drying curve, drying rate curve and optimal microwave power density were obtained, and the microwave drying kinetics model and effective water diffusion model of potato dice were established.
The effective water diffusivity model of potato dice was substituted into COMSOL Multiphysics software, and three coupled models of electromagnetic field, solid heat transfer and dilute matter transfer were established. The results showed that the microwave drying rate of potato dice entered a deceleration period after 270 s acceleration period. The optimum microwave power density of microwave drying equipment was 6 W/g, and the drying model could be based on Page equation. The effective water diffusivity of potato diced by microwave drying was 4.35 *10-9-9.02 *10-9 m2/s.
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