Hydrodynamics characteristics of hydrogen evolution process through electrolysis: Numerical and experimental studies

El‐Askary, W. A.; Sakr, I.M.; Ibrahim, Khaled Z.; Balabel, Ashraf

doi:10.1016/j.energy.2015.07.108

Cited by 53 publications

(26 citation statements)

References 31 publications

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“…However, it has been claimed that multi-phase flow systems are generally at least pseudo turbulent. 59 For better understanding of mathematical simulation of coalescence and break-up of bubbles, we recommend the reader consider Lau, Y.M. et al, 2014 48 and Jain, D. et al, 2014 52 for better understanding and detailed explanations.…”

Section: Two Phase Electrochemical Systemsmentioning

confidence: 99%

Review—Physicochemical Hydrodynamics of Gas Bubbles in Two Phase Electrochemical Systems

Taqieddin

Nazari

Rajić

et al. 2017

J. Electrochem. Soc.

109

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Electrochemical systems suffer from poor management of evolving gas bubbles. Improved understanding of bubbles behavior helps to reduce overpotential, save energy and enhance the mass transfer during chemical reactions. This work investigates and reviews the gas bubbles hydrodynamics, behavior, and management in electrochemical cells. Although the rate of bubble growth over the electrode surface is well understood, there is no reliable prediction of bubbles break-off diameter from the electrode surface because of the complexity of bubbles motion near the electrode surface. Particle Image Velocimetry (PIV) and Laser Doppler Anemometry (LDA) are the most common experimental techniques to measure bubble dynamics. Although the PIV is faster than LDA, both techniques are considered expensive and time-consuming. This encourages adapting Computational Fluid Dynamics (CFD) methods as an alternative to study bubbles behavior. However, further development of CFD methods is required to include coalescence and break-up of bubbles for better understanding and accuracy. The disadvantages of CFD methods can be overcome by using hybrid methods. The behavior of bubbles in electrochemical systems is still a complex challenging topic which requires a better understanding of the gas bubbles hydrodynamics and their interactions with the electrode surface and bulk liquid, as well as between the bubbles itself.

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Section: Two Phase Electrochemical Systemsmentioning

confidence: 99%

Review—Physicochemical Hydrodynamics of Gas Bubbles in Two Phase Electrochemical Systems

Taqieddin

Nazari

Rajić

et al. 2017

J. Electrochem. Soc.

109

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show abstract

“…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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“…[17]) to very low-lwevel studies of internal processes. An example of the latter is the model of El-Askary et al, who considered bubbly two-phase flow in a mathematical model based on Eulerian-Eulerian two-fluids solved by the SIMPLE algorithm [18].…”

Section: Introductionmentioning

confidence: 99%

Modelling and simulation of an alkaline electrolyser cell

Abdin

Webb

Gray

2017

Energy

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An enhanced one-dimensional model has been developed for an alkaline electrolyser cell for hydrogen production, based on linked modular mathematical models in Simulink ® .Where possible, the model parameters were derived on a physical basis and related to the materials of construction and the configuration of its components. This means that the model can be applied to many alkaline electrolyser cells, whereas existing semi-empirical models were generally developed for a specific cell. In addition to predicting the overall equilibrium electrolyser cell performance, the model is a powerful tool for understanding the contributions to cell voltage from the various internal components. It is thus useful as a guide to researchers aiming for improved performance through modified geometry and enhanced electrode materials. The model performed very well when compared to published models tested against the same sets of experimental data.

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Hydrodynamics characteristics of hydrogen evolution process through electrolysis: Numerical and experimental studies

Cited by 53 publications

References 31 publications

Review—Physicochemical Hydrodynamics of Gas Bubbles in Two Phase Electrochemical Systems

Review—Physicochemical Hydrodynamics of Gas Bubbles in Two Phase Electrochemical Systems

Euler–Lagrange Modeling of Bubbles Formation in Supersaturated Water

Modelling and simulation of an alkaline electrolyser cell

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