On the performance of multilayered membrane filters
On the performance of multilayered membrane filters
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DOI：
10.1007/s10665-021-10118-2
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发表时间：
2021-03
影响因子：
1.3
通讯作者：
D. Fong;L. Cummings;S. J. Chapman;P. Sanaei
中科院分区：
文献类型：
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作者：
D. Fong;L. Cummings;S. J. Chapman;P. Sanaei
多层膜过滤器由具有不同性质（例如孔径和空隙率）的薄多孔膜的堆叠组成，广泛用于工业应用中以从溶剂中去除污染物和不期望的杂质（颗粒）。实验观察到，精心设计的多层结构膜的性能明显优于等效的均质膜。多层膜的数学表征和建模可以帮助我们理解每层的特性如何影响整个膜堆的性能。在本文中，我们提出了一个简化的数学模型来描述一个多层膜的孔隙尺度属性如何影响整体过滤性能。我们的研究结果表明，对于初始层孔隙率随深度而降低的膜堆，滤膜内较大的（负）孔隙率梯度有利于提高通量和过滤器寿命，但以中等程度的初始颗粒截留率为代价。我们还发现，使总通量最大化的最佳层厚度分布对应于具有较大（负）孔隙率梯度的膜堆叠，其中层厚度在膜的深度上的连续层之间略微增加。
Multilayered membrane filters, which consist of a stack of thin porous membranes with different properties (such as pore size and void fraction), are widely used in industrial applications to remove contaminants and undesired impurities (particles) from a solvent. It has been experimentally observed that the performance of well-designed multilayer structured membranes is markedly better than that of equivalent homogeneous membranes. Mathematical characterization and modeling of multilayered membranes can help our understanding of how the properties of each layer affect the performance of the overall membrane stack. In this paper, we present a simplified mathematical model to describe how the pore-scale properties of a multilayered membrane affect the overall filter performance. Our results show that, for membrane stacks where the initial layer porosity decreases with depth, larger (negative) porosity gradients within a filter membrane are favorable for increasing throughput and filter lifetime, but at the expense of moderately poorer initial particle retention. We also found that the optimal layer thickness distribution that maximizes total throughput corresponds to a membrane stack with larger (negative) porosity gradients in which layer thickness increases slightly between successive layers in the depth of the membrane.