Gas-Evolving Electrodes

Vogt, Helmut

doi:10.1007/978-1-4615-6690-8_7

Cited by 73 publications

(51 citation statements)

References 115 publications

(96 reference statements)

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“…The problem of simulating electrolytically formed bubbles in molten salts was solved by the authors of [6][7][8][9][10][11][12][13]. The investigation of the fluid dynamics phenomena occurring during the electrolysis was required using the low-temperature model.…”

Section: Physical Simulationmentioning

confidence: 99%

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Motion dynamics of anodic gas in the cryolite melt–alumina high-temperature slurry

Yasinskiy

Polyakov

Klyuchantsev

2017

Russ. J. Non-ferrous Metals

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Abstract-The results of physical simulation of the behavior of bubbles formed due to the electrochemical evolution of oxygen on an inert anode during the high-temperature electrolysis of alumina slurry in the fluoride melt are presented. Similarity criteria are calculated, the experiments for a water model with vertically oriented electrodes are performed, and the data on the behavior of bubbles in the slurry are found with the help of video recording. The 20% aqueous solution of sulfuric acid with an alumina content of 30 vol % was used as the model electrolyte. The experiments were performed in a range of current densities from 0.05 to 0.25 A/cm 2 . Video was recorded using a Nikon D3100 camera with a recording frequency of 30 frames/s. The data on the motion dynamics of the bubbles, the quantitative data that characterize coalescence, and the bubble lifting velocity are found. To determine the average lifting velocity, 125 bubbles were analyzed. They were 0.8-2.3 mm thick. The bubble motion is performed in the slug regime with lifting velocity of 1.0-2.3 cm/s. The bubble layer thickness was about 5 mm. Further investigations will be directed to finding new data on the behavior of bubbles for various solid phase contents, current density, electrode slope angle, and granulometric composition.

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Section: Physical Simulationmentioning

confidence: 99%

“…(3), we should find values of a 1 , a 2 , and a 3 in the expression (4) Solving the set of equations (5) we will derive (6) Thus, first similarity criterion π 1 will have the form (7) It is evident that the first criterion is the Reynolds criterion. Other criteria can be calculated in a similar manner.…”

Section: Physical Simulationmentioning

confidence: 99%

Motion dynamics of anodic gas in the cryolite melt–alumina high-temperature slurry

Yasinskiy

Polyakov

Klyuchantsev

2017

Russ. J. Non-ferrous Metals

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“…The length of the upper and bottom parts are A = 20 mm and B = 10 mm, respectively. The cathode, where hydrogen is produced according to (1) is located at x = 7 mm (two channel widths plus one wall thickness), The whole system is enclosed within an external container, which represents the reactor. The reactor is open at the top.…”

Section: Triple-channel (Geometry 2)mentioning

confidence: 99%

“…Thus, every advance in optimization and improvement of these processes can lead to significant energy conservation and cost reduction. This provides the motivation for many experimental [1][2][3] and theoretical [4][5][6] studies in the field. In many cases (e.g., chlorate production, hypochlorite generation, or perchlorate electrolysis) the industrial scale electrochemical cell consists of a series of channels immersed in a bath of electrolyte.…”

Section: Introductionmentioning

confidence: 99%

The Flow Pattern in Single and Multiple Submerged Channels with Gas Evolution at the Electrodes

Alexiadis

Duduković

Ramachandran

et al. 2012

International Journal of Chemical Engineering

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We show that the gas-liquid flow pattern in a single gas-evolving electrochemical channel can be remarkably different from the flow pattern in multiple submerged gas-evolving electrochemical channels. This is due to the fact that in a single channel there is a higher accumulation of small bubbles and these can considerably affect the liquid velocity pattern which in turn may affect the performance of a cell. Since experimental work is often carried out in single channels, while industrial applications almost always involve multiple channels, this study provides insight into the factors that affect the flow pattern in each situation and establishes the basis for relating the behavior of single-and multiple-channel devices.

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“…The reader is referred to their individual theses for specific details [127][128][129][130][131][132][133][134][135][136][137][138][139][140][141], and to review articles by Vogt and Sides for a broader introduction to the field of electrolytic gas evolution [ 164,166].…”

Section: Introductionmentioning

confidence: 99%

Micro-scale mass-transfer variations during electrodeposition

Sutija¹

1991

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Gas-Evolving Electrodes

Cited by 73 publications

References 115 publications

Motion dynamics of anodic gas in the cryolite melt–alumina high-temperature slurry

Motion dynamics of anodic gas in the cryolite melt–alumina high-temperature slurry

The Flow Pattern in Single and Multiple Submerged Channels with Gas Evolution at the Electrodes

Micro-scale mass-transfer variations during electrodeposition

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