Investigation of the influence of the void fraction on the energy consumption of a vertical electrolyser under natural convection

Wosiak, Gabriel; Silva, Jeyse da; Sena, Sthefany; Carneiro‐Neto, Evaldo B.; Lopes, Mauro Chierici; Pereira, Ernesto C.

doi:10.1016/j.jece.2022.107577

Cited by 7 publications

(3 citation statements)

References 38 publications

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“…Because of the bubble effect, the conductivity of the KOH electrolyte and the generated bubbles will cover the electrode surface, affecting the exc density of the electrode reaction. Therefore, the effective electrolyte condu effective exchange current density are described according to the Bruggema shown in Equation (18) and Equation (19), respectively [28,33]. 1.5 i eff = i 0 (1α g ) 1.5 where σ eff is the effective electrolyte conductivity in S m −1 , σ 0 is the total e ductivity in S m −1 , i eff is the effective exchange current density in A m −2 , i 0 i current density in A m −2 , α g is the gas volume fraction, and the subscript g O2.…”

Section: Initial Values and Boundary Conditionsmentioning

confidence: 99%

“…Because of the bubble effect, the conductivity of the KOH electrolyte will decrease, and the generated bubbles will cover the electrode surface, affecting the exchange current density of the electrode reaction. Therefore, the effective electrolyte conductivity and the effective exchange current density are described according to the Bruggeman equation, as shown in Equation (18) and Equation (19), respectively [28,33].…”

Section: Initial Values and Boundary Conditionsmentioning

confidence: 99%

“…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. According to the above, it can note that with the development of computer science, the numerical simulation of hydrogen production by water electrolysis has gradually become a research hotspot [ 18 , 19 , 20 ]. Compared with the actual experiment, one of the advantages of numerical simulation is that it can get relevant results without actual experiments, which is cost-effective and has a low time cost for experimental design.…”

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

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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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Section: Initial Values and Boundary Conditionsmentioning

confidence: 99%

Section: Initial Values and Boundary Conditionsmentioning

confidence: 99%

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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Electrocatalytic contributions from Brazilian research groups for clean energy conversion and environmental remediation

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Improved Approximation Scales for Unreplicated Factorial Experiments

Aboukalam

Alharbi

Bhatti³

2022

J Stat Theory Appl

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Assessing the sizes of active contrasts in un-replicated factorial and fractional factorial experiments by quick and powerful methods are required in analyzing the big data in various research areas of Human endeavors. One of the old methods based on Lenth (1989) is being used in some statistical and data analytical applications which is fast and less efficient. We propose a new class of tests which are simpler, faster, and more powerful using the location median-function ($${\psi }_{med}\left({\varvec{x}}\right)$$ ψ med x ) after being skipped one and/or two times. An empirical study of simulation experiments to compute the critical values, sizes and powers using various sample sizes demonstrate the superiority of our methods. The proposed methods are illustrated in examples which can be employed in various fields of research in conducting data analytics using high computing power and machine learning.

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Investigation of the influence of the void fraction on the energy consumption of a vertical electrolyser under natural convection

Cited by 7 publications

References 38 publications

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

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

Electrocatalytic contributions from Brazilian research groups for clean energy conversion and environmental remediation

Improved Approximation Scales for Unreplicated Factorial Experiments

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