大麦苗干燥特性与力学性能试验OA

In order to solve the problems of short preservation period and easy corruption of fresh barley seedlings after harvest,and realize large-scale processing and utilization,the effects of drying parameters(temperature,wind speed,initial moisture content)on the drying characteristics and the changes of mechanical properties at different temperatures were investigated by thin-layer hot air drying test.The results show that the three factors significantly affect the drying process,and the temperature is the most critical.As the temperature increased from 35 ℃ to 55 ℃,the effective mois-ture diffusion coefficient increased from 7.64 × 10-11 m2/s to 2.56 × 10-10 m2/s,and the drying activation energy was 66.097 1 kJ/mol.The wind speed of 1.6 m/s can shorten the drying time and accelerate the evaporation of water.The initial water content is high,the early dehydration is fast but the total time is prolonged.In terms of mechanical proper-ties,the toughness of barley seedlings at 35℃ was better,the strength at 45 ℃ was improved,and the brittleness at 55 ℃ was obvious.In summary,45 ℃ and 1.2 m/s are the optimal drying conditions,which can provide theoretical and technical reference for related processing and product development.