摘要
为了得到高品质的干制品,基于黏弹性理论和Maxwell固体特性,建立了多孔材料干燥过程中黏弹性应力数学模型。采用MATLAB编程的方法对马铃薯热风干燥过程中内部各单元层干燥应力进行数值模拟计算。计算结果表明:随着干燥过程的进行马铃薯各单元层产生干燥应力为压应力且逐渐增大,达到最大值后开始减小;当压应力减小到0时出现应力反向现象,各单元层应力由压应力变成拉应力,拉应力逐渐增大到最大值后开始减小直至达到平衡不再发生变化。在整个热风干燥过程中干燥过程中,内单元层干燥应力值总是大于外单元层应力值,且表单元层的干燥应力始终为0。通过实验对模型进行验证,验证结果表明此模型可以用来表述干燥过程中多孔材料内部应力变化和分布规律。
In order to get high quality dry products, a mathematical model of visco-elastic stress was established for numerical simulation of internal stress of potato based on visco-elastic theory and Maxwell solid attributes. The result shows that the layer compression stress increases as the drying process goes, and it begins to decrease when achieving the maximum value. The stress reverse appears when the compression stress reduces to zero, the layer stress changes from compressive stress to tensile stress, and the tensile stress increases to a maximum and then decreases until equilibrium is reached. The inner layer stress is always more than the outer stress, and the surface stress is always zero in the whole drying process. The result reveals that the model can be used to predict the drying stress of potato.
出处
《化学工程》
CAS
CSCD
北大核心
2015年第3期33-36,共4页
Chemical Engineering(China)
基金
云南省自然科学基金资助项目(2003E0023M)
云南省教育厅科学研究项目重大专项项目(ED2010002)
