Coupling CFD with a one-dimensional model to predict the performance of reverse electrodialysis stacks

Cerva, Mariagiorgia La; Liberto, Massimiliano Di; Gurreri, Luigi; Tamburini, Alessandro; Cipollina, Andrea; Micale, G.; Ciofalo, Michele

doi:10.1016/j.memsci.2017.07.030

Cited by 79 publications

(115 citation statements)

References 46 publications

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“…In electro-membrane processes such as electrodialysis (ED) [1] and reverse electrodialysis (RED) [2], performance predictions are usually based on simulation models or empirical correlations in which the geometric configurations of the solution-filled channels and of the ion exchange membranes are assumed to be the nominal (undeformed) one [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Pressure-Induced Deformation of Pillar-Type Profiled Membranes and Its Effects on Flow and Mass Transfer

et al. 2019

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In electro-membrane processes, a pressure difference may arise between solutions flowing in alternate channels. This transmembrane pressure (TMP) causes a deformation of the membranes and of the fluid compartments. This, in turn, affects pressure losses and mass transfer rates with respect to undeformed conditions and may result in uneven flow rate and mass flux distributions. These phenomena were analyzed here for round pillar-type profiled membranes by integrated mechanical and fluid dynamics simulations. The analysis involved three steps: (1) A conservatively large value of TMP was imposed, and mechanical simulations were performed to identify the geometry with the minimum pillar density still able to withstand this TMP without collapsing (i.e., without exhibiting contacts between opposite membranes); (2) the geometry thus identified was subject to expansion and compression conditions in a TMP interval including the values expected in practical applications, and for each TMP, the corresponding deformed configuration was predicted; and (3) for each computed deformed configuration, flow and mass transfer were predicted by computational fluid dynamics. Membrane deformation was found to have important effects; friction and mass transfer coefficients generally increased in compressed channels and decreased in expanded channels, while a more complex behavior was obtained for mass transfer coefficients.

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Section: Introductionmentioning

confidence: 99%

Pressure-Induced Deformation of Pillar-Type Profiled Membranes and Its Effects on Flow and Mass Transfer

et al. 2019

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“…However, in this case they have limited prediction capabilities, providing accurate results only under some conditions [47]. On the contrary, distributed parameters models [49][50][51][52][53][54][55][56] are more accurate, but at the cost of a larger implementation effort. In summary, with respect to the theoretical models, 1-D semi-empirical models are preferable as process simulators thanks to their features of versatility, robustness and effectiveness.…”

Section: Overview Of Modelling Approaches For Electrodialysismentioning

confidence: 99%

“…In particular, the majority makes use of either empirical information [42][43][44]48,52,55,57] (e.g. limiting current density) or 3-D computational fluid dynamics (CFD) simulations [50,51,54,56].…”

Section: Overview Of Modelling Approaches For Electrodialysismentioning

confidence: 99%

“…(2), the interface salt concentrations (solution side) appearing in eq. (13) can be estimated by the following relations [7,50]:…”

Section: Appendix E: Concentration Polarisation and Pressure Dropsmentioning

confidence: 99%

“…where ∆ is the pressure drop, is the density of solution, is the Darcy friction coefficient that it is correlated to the Reynolds number [50,73] and is the average superficial velocity, with the local superficial velocity being defined as:…”

Section: Appendix E: Concentration Polarisation and Pressure Dropsmentioning

confidence: 99%

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A hierarchical model for novel schemes of electrodialysis desalination

et al. 2019

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A new hierarchical model for the electrodialysis (ED) process is presented. The model has been implemented into gPROMs Modelbuilder (PSE), allowing the development of a distributedparameters simulation tool that combines the effectiveness of a semi-empirical modelling approach to the flexibility of a layered arrangement of modelling scales. Thanks to its structure, the tool makes possible the simulation of many different and complex layouts, requiring only membrane properties as input parameters (e.g. membrane resistance or salt and water permeability). The model has been validated against original experimental data obtained from a lab scale ED test rig. Simulation results concerning a 4-stage treatment of seawater and dynamic batch operations of brackish water desalination are presented, showing how the model can be effectively used for predictive purposes and for providing useful insights on design and optimisation. Self-Archived version: Campione A, Cipollina A, Bogle IDL, Gurreri L, Tamburini A, Tedesco M, et al. A hierarchical model for novel schemes of electrodialysis desalination. Desalination 2019;465:79-93.

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Novel design of flow path spacers for reverse electrodialysis cell

Basu

Mahajan

2023

Can J Chem Eng

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Reverse electrodialysis (RED) is one of the technologies used to harness ‘Blue Energy’, which is generated from the controlled separation of ions between salt water and fresh water through cation and anion exchange membranes (CEM/AEM) stack with end electrodes. The spacers present in between CEM and AEM allows the flow of salt and fresh water significantly affecting the fouling and concentration polarization in the RED cell. The present work focuses on improvement in flow path design, which may be used in place of mesh spacers in order to reduce pressure drop and enhance shear stress on the surface of the membrane to reduce concentration polarization. A three‐dimensional direct numerical simulation of the Navier–Stokes equation is conducted using Fluent 14.0 to analyze four different flow field designs, including serpentine, criss‐cross, rhombus, diamond, and standard mesh spacers. The simulation predicted closely the experimental data on pressure drop for the mesh spacers available in the literature. The present study points out that the diamond type flow field design, which combines characteristics of mesh spacers and flow field plates, gives lesser pressure drop per unit length with the increase in velocity within the same range of shear stress generated in mesh spacers. In other words, net power density of RED would improve with the use of diamond type spacer flow field with the decrease in concentration polarization loss and pumping power density.

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Coupling CFD with a one-dimensional model to predict the performance of reverse electrodialysis stacks

Cited by 79 publications

References 46 publications

Pressure-Induced Deformation of Pillar-Type Profiled Membranes and Its Effects on Flow and Mass Transfer

Pressure-Induced Deformation of Pillar-Type Profiled Membranes and Its Effects on Flow and Mass Transfer

A hierarchical model for novel schemes of electrodialysis desalination

Novel design of flow path spacers for reverse electrodialysis cell

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