ABSTRACT: In order to explore the influencing factors of Weibull distribution function and its application in microwave-hot-air drying of wolfberry, the drying conditions of wolfberry under different pulse ratio (pulse ratio 1.5:2 min/1 min; pulse ratio 1.67:3 min/2 min; pulse ratio 2:1 min/1 min), microwave power (185, 200, 215 W) and moisture content (30%, 40%, 50%) were studied. The drying process was studied. The Weibull distribution function was used to simulate the drying kinetics curve, and the effective diffusion coefficient of water and drying activation energy of Lycium barbarum microwave drying equipment were analyzed by the Weibull model.
The results show that Weibull distribution function can well simulate the microwave drying process of Lycium barbarum L. The scale parameter a is related to microwave pulse ratio, microwave power and moisture content, and decreases with the increase of microwave power, and increases with the increase of microwave pulse ratio and moisture content, while the initial moisture content, pulse ratio and microwave power have little influence on shape parameter beta. The effective water diffusion coefficient of Lycium barbarum L. was 1.7 *10-5~3.2 *10-5 m2/h and the drying activation energy of Lycium barbarum L. was 54.78 kJ/mol.
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