An improved Space-Charge model for flow through charged microporous membranes |
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| Institution: | 1. Department of Physics of Polymers and Crystals, Faculty of Physics, M.V. Lomonosov Moscow State University, Leninskiye Gory 1, 119991 Moscow, Russia;2. A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, INEOS, Vavilova Street 28, 119991 Moscow, Russia;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, PR China;2. Department of Petroleum Engineering, China University of Petroleum (Beijing), Beijing, 102249, PR China;1. Intelligent Material and System Lab, Institute of Technology, University of Tartu, Nooruse 1, 50411, Tartu, Estonia;2. Conducting polymers in composites and applications Research Group, Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Viet Nam |
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| Abstract: | The Space-Charge model is modified to better analyze the steady-state electrohydrodynamic behavior of aqueous monovalent electrolytes in charged microporous membranes. The effects of changes in solvent dielectric constant near the wall, ion hydration effects, finite ion sizes, and charge regulating surface effects, are incorporated into the governing electrohydrodynamic equations (i.e., Navier-Stokes (NSE), Nernst-Planck (NPE), and Poisson-Boltzmann (PBE) equations). Their effect on streaming potential, pore conductivity, excess conductivity, and maximum energy conversion efficiency for electro-osmosis is illustrated. It is shown that the dielectric saturation and ion hydration effects cause significant changes in the electric potential field and ion concentration inside the capillary tubes. Quantitative comparisons of model results with measured electrokinetic data reveal better agreement when compared with the existing model. |
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