Microwave Drying Characteristics and Kinetic Model of Carrot

In order to study the microwave drying characteristics of carrots,the drying test of different microwave power(406,567,700 W),slice thickness(2,4,6 mm)and loading amount(30,40,90 g)was carried out,and the water loss rate was discussed. The drying characteristic curve of dry water content and the effect of effective water diffusion coefficient D_eff were studied to construct a thin layer drying dynamics model of carrot. The results showed that the microwave drying of carrots was divided into preheating drying stage and slowing drying stage,and the constant-speed drying process time was short;With the conditions of microwave power 700 W,slice thickness 6 mm and loading amount 30 g,the drying effect was the best. By regression fitting analysis,the Page dynamics model was most suitable for describing the microwave drying process of carrots. The model determination coefficient R² was greater than 0.98,and the maximum error of the verification test was 6.91%.