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Spherical porous particle drying using BEM approach

机译：使用BEM方法干燥球形多孔颗粒

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The paper covers a porous particle drying problem, which can be divided into two or three stages. The first stage is drying of surface moisture, the second stage is drying inside the particle, and the third, one which is relevant only to hygroscopic material, represents the change of particle moisture due to the change of environmental moisture. The second stage is the most relevant for the porous materials, and is, therefore, covered in more detail in this paper, with the main focus on the heat transfer inside the particle which affects the drying kinetics. The heat transfer problem inside the spherical particle has been solved using BEM, by transforming a 3D problem into a quasi 1D case by assuming uniform boundary conditions all around the particle, resulting in the solution depending only on the radial direction. The solution of the heat transfer needs to be calculated accurately as it directly affects the evaporation rate of the liquid on the interface between the dry crust and the wet core, which dictates the drying speed and affects the drying time. An in-depth analysis of space and time discretisation was performed on a typical spray drying example, where it is shown that a choice of a correct time step is cruicial for achieving good computational accuracy of the drying kinetics. The proposed numerical approach has also been tested on various drying conditions, with changing the particle size and the temperature of the drying gas, which have a largest effect on the drying kinetics. Finally, an analysis of the computed drying times is made as this is the most important parameter from the practical point of view, especially when designing the drying chambers.
机译：本文涵盖了多孔颗粒干燥问题，可以分为两个或三个阶段。第一阶段是表面水分的干燥，第二阶段是颗粒内部的干燥，第三阶段（仅与吸湿性材料有关）代表由于环境水分变化而引起的颗粒水分变化。第二阶段与多孔材料最相关，因此，本文将对其进行更详细的介绍，主要集中在影响干燥动力学的颗粒内部传热。球形粒子内部的传热问题已通过BEM解决，方法是通过在整个粒子周围均采用统一的边界条件，将3D问题转换为准1D情况，从而得出仅取决于径向方向的解。传热的解需要精确计算，因为它直接影响干壳与湿芯之间界面上液体的蒸发速率，这决定了干燥速度并影响了干燥时间。在一个典型的喷雾干燥实例上对空间和时间离散化进行了深入的分析，结果表明选择正确的时间步长对于实现干燥动力学的良好计算精度至关重要。所提出的数值方法还已经在各种干燥条件下进行了测试，其中改变了干燥气体的粒径和温度，这对干燥动力学影响最大。最后，对计算出的干燥时间进行分析，因为从实用的角度来看，这是最重要的参数，尤其是在设计干燥室时。

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