Numerical modeling for particulate flow through realistic microporous structure of microfiltration membrane: Direct numerical simulation coordinated with focused ion beam scanning electron microscopy
Numerical modeling for particulate flow through realistic microporous structure of microfiltration membrane: Direct numerical simulation coordinated with focused ion beam scanning electron microscopy
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DOI：
10.1016/j.powtec.2022.117872
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发表时间：
2022-08-27
影响因子：
5.2
通讯作者：
Ishigami, Toru
中科院分区：
文献类型：
--
作者：
Kawashima, Kenta;Shirzadi, Mohammadreza;Ishigami, Toru
在这项研究中，利用聚焦离子束扫描电子显微镜（FIB-SEM）技术来获得莫来石和α-氧化铝膜（它们是市售微滤（MF）膜）的真实微观结构几何形状，以便在基于耦合直接数值模拟（DNS）和离散元法（DEM）的高分辨率数值模拟模型中实现。针对不同粒径评估通过膜孔的流量和颗粒渗透。所开发的模拟模型是增强我们对 MF 过程理解的有力工具，因为它引入了实际 MF 膜的真实微孔结构，而不是先前数值研究中使用的简化膜模型结构，例如直圆柱形孔和颗粒堆积结构。讨论了所开发的模型在排斥曲线预测中的应用，这表明考虑真实的微孔结构对于准确预测 MF 过程的重要性。结果显示，莫来石膜和α-氧化铝膜的截留曲线不同，这主要是由于两种膜的局部孔径分布存在差异。此外，还评估了通过膜的详细颗粒渗透情况，这在实际 MF 膜的实验分析中是不可行的。
In this study, the focused ion beam scanning electron microscope (FIB-SEM) technique is utilized to obtain a realistic microstructure geometry of mullite and alpha-alumina membranes, which are commercially available microfiltration (MF) membranes, for implementation in a high-resolution numerical simulation model based on coupled direct numerical simulation (DNS) and the discrete element method (DEM). The flow and particle permeation through the membrane pores are evaluated for different particle sizes. The developed simulation model is a powerful tool for enhancing our understanding of the MF process because it introduces the realistic microporous structure of an actual MF membrane rather than the simplified membrane model structures such as straight cylindrical pores and particle packing structures that have been used in previous numerical studies. The application of the developed model is discussed for the prediction of the rejection curve, which shows the importance of considering a realistic microporous structure for the accurate prediction of the MF process. The results showed different rejection curves for the mullite and alpha-alumina membranes, which mainly contributed to the difference in the local pore size distributions of the two membranes. Furthermore, detailed particle permeation through the membrane is evaluated, which is not feasible in experimental analyses for realistic MF membranes.