Abstract

A mathematical model of the processes of heat and mass transfer during the convective drying of a colloidal capillary-porous material, taking into account the phenomenon of shrinkage, is presented. This model is formulated in an area with a movable boundary. The mass conductivity equation includes a convective term to describe the additional internal mass transfer of the material by the matrix. The formulated nonlinear problem of heat and mass transfer is solved numerically using the data obtained in this work on the coefficient of mass conductivity and the known literature data on other thermophysical characteristics. The verification of the one-dimensional model was carried out on the basis of experimental drying curves for apple disks cut from a whole fruit. It is shown that the deformation of the sample during its dehydration significantly affects the kinetics of the drying process of the colloidal capillary-porous material.

中文翻译：

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考虑板的收缩率计算干燥板的动力学

摘要

考虑到收缩现象，提出了胶体毛细多孔材料对流干燥过程中传热传质过程的数学模型。该模型是在具有可移动边界的区域中制定的。质量电导率方程包括一个对流项，用于描述基质对材料的额外内部传质。使用在这项工作中获得的关于质量传导系数的数据和关于其他热物理特性的已知文献数据，以数值方式求解了公式化的传热和传质非线性问题。一维模型的验证是基于从整个水果上切下的苹果圆盘的实验干燥曲线进行的。