Characterization and quantification of structure and flow in multichannel polymer membranes by MRI
Characterization and quantification of structure and flow in multichannel polymer membranes by MRI
复制标题
通过 MRI 表征和量化多通道聚合物膜的结构和流动
DOI：
10.1016/j.memsci.2018.10.072
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发表时间：
2019
影响因子：
9.5
通讯作者：
G. Guthausen
中科院分区：
文献类型：
--
作者：
S. Schuhmann;J.W. Simkins;N. Schork;S.L. Codd;J.D. Seymour;M. Heijnen;F. Saravia;H. Horn;H. Nirschl;G. Guthausen
开发聚合物多通道中空纤维膜是为了减少纤维断裂并增加体积与膜表面的比率，从而提高过滤过程的效率。这些膜通常用于超滤，并以进出死端模式运行。然而，一些过滤细节尚不清楚。多通道膜中的过滤效率和流量取决于过滤时间，并且预计会沿空间坐标变化。在当前的工作中，原位磁共振成像被用来回答这些问题。对进料通道中的速度进行量化，以获得对过滤过程的详细了解。在海藻酸钠过滤过程中，测量了七个通道中每个通道的流量和沉积物，海藻酸钠是水处理中出现的细胞外聚合物的模型物质。体积流量和流量剖面是根据相衬流量图像计算的。中心通道中 z 方向的流量高于周围通道中的流量。流量分布随 Ca2+ 的浓度而变化，这改变了海藻酸钠水溶液的过滤机制，从浓差极化到凝胶层过滤。
Polymeric multichannel hollow fiber membranes were developed to reduce fiber breakage and to increase the volume-to-membrane-surface ratio and consequently the efficiency of filtration processes. These membranes are commonly used in ultrafiltration and are operated in in-out dead-end mode. However, some of the filtration details are unknown. The filtration efficiency and flow in the multichannel membranes depend on filtration time and are expected to vary along spatial coordinates. In the current work,in-situmagnetic resonance imaging was used to answer these questions. Velocities were quantified in the feed channels to obtain a detailed understanding of the filtration process. Flow and deposits were measured in each of the seven channels during filtration of sodium alginate, which is a model substance for extracellular polymeric substances occurring in water treatment. Volume flow and flow profiles were calculated from phase contrast flow images. The flow inz-direction in the center channel was higher than in the surrounding channels. Flow profiles variate depending on the concentration of Ca2+, which changes the filtration mechanism of aqueous solutions of sodium alginate from concentration polarization to gel layer filtration.
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影响因子：
9.5
作者：
Fridjonsson, E. O.;Vogt, S. J.;Johns, M. L.
通讯作者：
Johns, M. L.
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影响因子：
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作者：
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DOI：
--
发表时间：
1998
期刊：
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影响因子：
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作者：
Vrouwenvelder, J. S.;von der Schulenburg, D. A. Graf;van Loosdrecht, M. C. M.
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van Loosdrecht, M. C. M.
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影响因子：
1.1
作者：
R. Linares;L. Fortunato;N. Farhat;Szilárd S. Bucs;M. Staal;E. Fridjonsson;M. Johns;J. Vrouwenvelder;T. Leiknes
通讯作者：
T. Leiknes