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为了解干燥过程中玉米籽粒内部水分的扩散过程,优化干燥工艺参数,本文采用模拟研究和实验研究方法分析干燥过程中玉米籽粒内部水分分布随时间的变化规律。玉米籽粒由种皮、角质胚乳、粉质胚乳和胚四组分组成,四种组分水分扩散系数各不相同,本文分别假设玉米籽粒由单组分均质体和多组分非均质体组成,分别建立了玉米籽粒的干燥数学模型,利用COMSOL Multiphysics模块模拟研究了玉米籽粒内部的水分变化情况,并通过玉米籽粒的薄层干燥实验进行了实验验证。研究结果表明,建立的两个模型均可有效模拟玉米籽粒薄层干燥过程;80℃的模拟值与实验值的差异较70℃的小;玉米籽粒多组分模型精度优于单组分模型精度。
In order to understand the diffusion process of moisture inside corn kernel during drying and to optimize the drying process parameters, the simulation study and experimental research were used to analyze the variation of moisture distribution inside the kernel during the drying process. The maize kernel consists of four components: seed coat, keratinocyte, endosperm and embryo. The diffusion coefficient of water content of the four components is different. In this paper, the maize kernels are composed of single-component and multi-component heterogeneous The dry mathematical models of maize kernels were established. The COMSOL Multiphysics module was used to simulate the changes of water content in maize kernels. The experimental results were verified by thin layer drying experiments of maize kernels. The results show that the established two models can effectively simulate the drying process of corn kernels. The difference between simulated and experimental values at 80 ℃ is smaller than that at 70 ℃. The precision of corn multicomponent model is better than that of single-component model .