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Membrane Water Treatment Volume 15, Number 1, January 2024 , pages 31-39 DOI: https://doi.org/10.12989/mwt.2024.15.1.031 |
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Slippage on which interface in nanopore filtration? |
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Xiaoxu Huang, Wei Li and Yongbin Zhang
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| Abstract | ||
| The flow in a nanopore of filtration membrane is often multiscale and consists of both the adsorbed layer flow and the intermediate continuum fluid flow. There is a controversy on which interface the slippage should occur in the nanopore filtration: On the adsorbed layer-pore wall interface or on the adsorbed layer-continuum fluid interface? What is the difference between these two slippage effects? We address these subjects in the present study by using the multiscale flow equations incorporating the slippage on different interfaces. Based on the limiting shear strength model for the slippage, it was found from the calculation results that for the hydrophobic pore wall the slippage surely occurs on the adsorbed layer-pore wall interface, however for the hydrophilic pore wall, the slippage can occur on either of the two interfaces, dependent on the competition between the interfacial shear strength on the adsorbed layer-pore wall interface and that on the adsorbed layer-continuum fluid interface. Since the slippage on the adsorbed layer-pore wall interface can be designed while that on the adsorbed layer-continuum fluid interface can not, the former slippage can result in the flux through the nanopore much higher than the latter slippage by designing a highly hydrophobic pore wall surface. The obtained results are of significant interest to the design and application of the interfacial slippage in nanoporous filtration membranes for both improving the flux and conserving the energy cost. | ||
| Key Words | ||
| adsorbed layer; fluid; mass transport; multiscale; nanopore; slippage | ||
| Address | ||
| Xiaoxu Huang and Wei Li: School of Mechanical Technology, Wuxi Institute of Technology, Gaolang Xilu 1600, 214121, Wuxi, Jiangsu Province, China Yongbin Zhang: College of Mechanical Engineering, Changzhou University, Gehu Lu 21, Wujin, 213164, Changzhou, Jiangsu Province, China | ||