During the coating and drying of thin polymer-particle composites, the particle geometry has a big impact on the prediction of concentration profiles in the dry film. In this work, a plate-like geometry is used to evaluate the mass transport of the particles with the aspect ratio as a variable. The experimental determination of the viscosity and sedimentation rates allows to simulate concentration profiles in the wet film while drying. A previous simulation model was automated to describe the drying of the plate-like particles—polyvinyl alcohol-water material system using COMSOL with the initial concentration, aspect ratio, Péclet number, and sedimentation number as input parameters. The results are summarized in drying regime maps, which show an increase in the evaporation regime when the aspect ratio decreases due to lower particle mobility. This shows the importance of the geometry while predicting the particle distribution in the dry film and designing coating and drying processes.

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关于非球形颗粒填充聚合物薄膜的干燥动力学：数值研究

在聚合物-颗粒复合材料的涂层和干燥过程中，颗粒几何形状对干膜中浓度分布的预测有很大影响。在这项工作中，板状几何形状用于评估颗粒的质量传递，纵横比作为变量。粘度和沉降速率的实验测定允许模拟干燥时湿膜中的浓度分布。使用 COMSOL 以初始浓度、纵横比、Péclet 数和沉降数作为输入参数，自动化先前的模拟模型来描述板状颗粒 - 聚乙烯醇 - 水材料系统的干燥。结果总结在干燥状态图中，这表明当长宽比由于较低的颗粒流动性而降低时，蒸发状态会增加。