Characteristics and Mathematical Models for Infrared-Dried Rough Rice
In this paper,the characteristics of infrared drying of rough rice under different conditions of initial moisture content,drying temperature and loading capacity were investigated by orthogonal test and the optimal scheme of infrared drying characteristics of rice was determined.The application of infrared drying of rough rice at 10 drying mathematical models were matched and the optimal rice infrared drying mathematical model was found.The results indicated that:in early drying stage,the water loss rate of rice changed greatly,and the water ratio decreased rapid-ly,while in late drying stage,the water loss rate changed gently.The order of the three main factors affecting the in-frared drying process of rice was:drying temperature B＞loading capacity C＞moisture content A;the optimal infra-red drying process for rough rice was the plan of the initial moisture content of 36％,drying temperature of 60 ℃ and loading capacity of 50 g,and the optimal drying mathematical model at this time was Wang and Singh model.Under the condition of loading capacity of 50 g and drying temperature of 70 ℃,the relative mean deviation between exper-imental result and predication were 1.563％and 1.474％,respectively,and it showed predicted drying curves fit well to those obtained from experiment.With the drying temperature increases,the effective moisture coefficient increased,when the drying temperature increased from 50 ℃ to 70 ℃,the effective moisture diffusion coefficient increased from 10.72 × 10-10 m2/s to 13.87 ×10-10 m2/s,and the activation energy for rough rice drying was 11.9 kJ/mol.
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