Fluid Dynamics and Mass Transfer Study of Electrochemical Oxidation by CFD Prediction and Experimental Validation

Liu, Li; Cai, Wangfeng; Chen, YiQing; Wang, Yan

doi:10.1021/acs.iecr.7b04226

Cited by 16 publications

(8 citation statements)

References 34 publications

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“…Examples of the use of these models can be found in the context of electrochemical reactions, where gasses are produced on electrodes. For instance, Liu et al [10] used the Two Fluid Model to simulate the electrochemical oxidation of p-methoxyphenol while El-Askary et al [11] simulated the production of hydrogen in an electrochemical cell. On the other hand, detailed DNS models are limited by the computational cost.…”

Section: Introductionmentioning

confidence: 99%

Euler–Lagrange Modeling of Bubbles Formation in Supersaturated Water

et al. 2018

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Phase transition, and more specifically bubble formation, plays an important role in many industrial applications, where bubbles are formed as a consequence of reaction such as in electrolytic processes or fermentation. Predictive tools, such as numerical models, are thus required to study, design or optimize these processes. This paper aims at providing a meso-scale modelling description of gas–liquid bubbly flows including heterogeneous bubble nucleation using a Discrete Bubble Model (DBM), which tracks each bubble individually and which has been extended to include phase transition. The model is able to initialize gas pockets (as spherical bubbles) representing randomly generated conical nucleation sites, which can host, grow and detach a bubble. To demonstrate its capabilities, the model was used to study the formation of bubbles on a surface as a result of supersaturation. A higher supersaturation results in a faster rate of nucleation, which means more bubbles in the column. A clear depletion effect could be observed during the initial growth of the bubbles, due to insufficient mixing.

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Section: Introductionmentioning

confidence: 99%

Euler–Lagrange Modeling of Bubbles Formation in Supersaturated Water

et al. 2018

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“…where C d is the drag coefficient, K g is the diffusion factor of mixed bubbles in m s −2 , and d b is the bubble diameter in m. The drag coefficient is defined by the Schiller-Naumann model as shown in Equation (17).…”

Section: Cfd Modelmentioning

confidence: 99%

“…Re (1 + 0.15 Re 0.687 ) Re ≤ 1000 0.44 Re > 1000 (17) where Re is the Reynolds number of bubbles calculated according to relative velocity, Re =ρ l U → r d b /µ l .…”

Section: Cfd Modelmentioning

confidence: 99%

“…Their simulation results compared with the experimental data and were in reasonable agreement with the experimental data at a higher current density due to the turbulence dispersion force added. Liu et al [ 17 ] constructed a two-phase bubble flow 2D numerical model in the electrolytic cell to study hydrodynamics and mass transfer based on the Euler–Euler method. The results showed that the effects of different operating conditions on the volume fraction and bubble layer were in good agreement with the experimental results.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study on Hydrodynamic Characteristics and Electrochemical Performance of Alkaline Water Electrolyzer by Micro-Nano Surface Electrode

Xia

Gao

et al. 2022

Materials

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This study constructed a two-dimensional alkaline water electrolyzer model based on the two-phase flow Euler–Euler model. In the model, the micro-nano surface electrodes with different structure types and graphic parameters (distance, height, and width) were used and compared with the vertical flat electrode to evaluate their influence on electrolysis performance. The simulation results show that the performance of the micro-nano surface electrode is much better than that of the vertical flat electrode. The total length of micro-nano structural units relates to the contact area between the electrode and the electrolyte and affects the cell voltage, overpotential, and void fraction. When rectangular structural units with a distance, height, and width of 0.5 µm, 0.5 µm, and 1 µm are used, the total length of the corresponding micro-nano surface electrode is three times that of the vertical flat electrode, and the cathode overpotential decreases by 65.31% and the void fraction increases by 54.53% when it replaces the vertical flat electrode.

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“…Therefore, this work aims to perform computational and experimental tools to design, construct, and evaluate a flowing electrochemical reactor from a full phenomenological hydrodynamic point of view, employing computer-aided (CAD) and additive manufacturing or three-dimensional (3D) printing technology. The use of the CFD simulation approach was intended due to the good description of the phenomena involved through single-phase electrochemical reactors by using mathematical models based on momentum governing equations. − …”

Section: Introductionmentioning

confidence: 99%

Effect of Flow Distributor Configuration on the Hydrodynamics in a Multipurpose Flow Electrochemical Reactor: Numerical Analysis and Experimental Characterization Employing Digital Image Treatment

López-Maldonado

Salazar-Colores

Piedra

et al. 2023

Ind. Eng. Chem. Res.

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Electrochemical reactors with a flat parallel plate electrode configuration and diverse flow channel designs have been extensively used in the study of different electrochemical processes at lab and bench scales, and they have been scaled up for some electrosynthesis and energy-storage processes at semipilot and industrial levels. Progress in the electrochemical process applications demands the use of different computer and experimental-assisted techniques to design novel electrochemical reactors. The objective of this work is to evaluate the hydrodynamic performance of different electrochemical reactor designs and quantify their effect on velocity magnitude through numerical and experimental studies using computational techniques like computational fluid dynamics (CFD) and digital image treatment. For local velocity magnitude measurements, a digital imaging treatment, based on the use of an optical flow algorithm, to try the validation of velocity profiles obtained by CFD is implemented. This experimental technique determined reliably that the problems associated with the use of the empty channel in the flow pattern are mainly associated with high velocities and recirculation zones, which are not detected by CFD simulations in the first instance. Also, the findings associated with the velocity behavior using this proposed technique agreed with those obtained by the traditional experimental flow characterization technique like residence time distribution, nevertheless, further work will be needed to refine the measurements and perform its comparison with other most employed velocimetry techniques.

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Fluid Dynamics and Mass Transfer Study of Electrochemical Oxidation by CFD Prediction and Experimental Validation

Cited by 16 publications

References 34 publications

Euler–Lagrange Modeling of Bubbles Formation in Supersaturated Water

Euler–Lagrange Modeling of Bubbles Formation in Supersaturated Water

Numerical Study on Hydrodynamic Characteristics and Electrochemical Performance of Alkaline Water Electrolyzer by Micro-Nano Surface Electrode

Effect of Flow Distributor Configuration on the Hydrodynamics in a Multipurpose Flow Electrochemical Reactor: Numerical Analysis and Experimental Characterization Employing Digital Image Treatment

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