摘要
目的:研究烟叶在复烤过程中的干燥收缩机制。方法:基于多孔介质理论和弹性理论,结合傅里叶定律和菲克定律实现烟叶干燥过程中热膨胀、吸湿膨胀和温度耦合过程的数值模拟。结果:烟叶在复烤过程中,最大应力出现在烟叶干燥3 min左右;干燥过程中水分应力远大于热应力;在低温慢烤过程中烟叶内部水分蒸发率较低,以至于烟叶收缩率不高;烟叶复烤过程中干燥阶段收缩率为10%,最大误差为3%。结论:水分含量是烟叶干燥收缩变形的主要影响因素。
Objective:To study the drying shrinkage mechanism of tobacco leaves during the redrying process.Methods:Based on the theory of porous media and elasticity,combined with Fourier s law and Fick's law,the numerical simulation of the thermal expansion,hygroscopic expansion and temperature coupling process in the tobacco leaf drying process was realized.Results:During the redrying process,the maximum stress occurred when the tobacco leaves were dried for about 3 minutes.The moisture stress during the drying process was much greater than the thermal stress;During the low-temperature slow-curing process,the internal moisture evaporation rate of the tobacco leaves was low,so that the shrinkage rate of the tobacco leaves was not high;The shrinkage rate in the drying stage during the redrying process of tobacco leaves was 10%,and the maximum error was 3%.Conclusion:The moisture content is the main influencing factor of the drying shrinkage and deformation of tobacco leaves.
作者
秦基伟
王立华
蒋维
王炯力
贾同鹏
QIN Ji-wei;WANG Li-hua;JIANG Wei;WANG Jiong-li;JIA Tong-peng(Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming,Yunan 650500,China)
出处
《食品与机械》
北大核心
2021年第11期136-141,共6页
Food and Machinery
基金
云南省重大科技专项计划(编号:202002AD080001)。
关键词
烟叶复烤
干燥
收缩变形
应力应变
tobacco redrying
dry
shrinkage deformation
stress-strain
