The Effect of “Wave Breakers” on the Magnetohydrodynamic Instability in Aluminum Reduction Cells

Pedcenko, Alex; Molokov, S.; Bardet, Benoît

doi:10.1007/s11663-016-0840-5

Cited by 13 publications

(8 citation statements)

References 8 publications

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“…(2009), Steiner (2009) or similar to what was done in the experimental devices of Pedchenko et al. (2009, 2017). Surface tension will be absent or present (value from Steiner (2009)).…”

Section: Numerical Validation Of the Theory In A Small-scale Reductiomentioning

confidence: 72%

“…Second, it is possible to apply the proposed perturbation method to cells with a rectangular geometry in order to derive a theoretical model for the experiments reported in Pedchenko et al. (2009, 2017). Or alternatively, perhaps these experiments could be done in a cylindrical geometry to make comparisons with the present model.…”

Section: Resultsmentioning

confidence: 99%

“…Cleverly designed small-scale demonstrators such as those of Pedchenko et al. (2009), Pedchenko, Molokov & Bardet (2017) (numerically simulated in Renaudier et al. (2016)) can then be easier to handle.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Perturbation theory for metal pad roll instability in cylindrical reduction cells

et al. 2019

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We propose a new theoretical model for metal pad roll instability in idealized cylindrical reduction cells. In addition to the usual destabilizing effects, we model viscous and Joule dissipation and some capillary effects. The resulting explicit formulas are used as theoretical benchmarks for two multiphase magnetohydrodynamic solvers, OpenFOAM and SFEMaNS. Our explicit formula for the viscous damping rate of gravity waves in cylinders with two fluid layers compares excellently to experimental measurements. We use our model to locate the viscously controlled instability threshold in cylindrical shallow reduction cells but also in Mg–Sb liquid metal batteries with decoupled interfaces.

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“…(2009), Steiner (2009) or similar to what was done in the experimental devices of Pedchenko et al. (2009, 2017). Surface tension will be absent or present (value from Steiner (2009)).…”

Section: Numerical Validation Of the Theory In A Small-scale Reductiomentioning

confidence: 72%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Perturbation theory for metal pad roll instability in cylindrical reduction cells

et al. 2019

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“…At present, cryolite-alumina molten salt electrolysis is the only method in industrial aluminium smelting. It is an industry that consumes a lot of energy, 95% of which comes from electricity [1][2][3]. In order to improve the energy efficiency of the aluminium electrolysis production process, core parameters such as alumina concentration [4][5][6], anode effect [7][8][9], cell resistance [10,11], and electrolyte temperature [12,13] have been extensively and deeply studied using mechanism, soft sensor, and digital simulation methods.…”

Section: Introductionmentioning

confidence: 99%

Online Prediction Method of Molten Aluminium Height in Electrolytic Cell Based on Extreme Learning Machine with Kernel Function

Cao

Cui

et al. 2021

Mathematical Problems in Engineering

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An online prediction method of molten aluminium height is proposed based on extreme learning machine with kernel function (K-ELM). Firstly, relevant variables that can be measured online related to aluminium liquid fluctuations were obtained by analyzing the mechanism model of aluminium liquid fluctuations. Then, the online prediction method of molten aluminium height is proposed based on kernel function and ELM, which just use the anode-cathode voltage and the anode rod current data. Finally, the data collection and experiment of 3 sets of anode rods in the 200 kA series aluminium electrolytic cells are carried out on-site. The results show that the maximum absolute error is only 0.25 cm and relative error is less than 1.4%, which satisfied the production site requirements. Compared with existing methods, it has certain advantages in real-time and prediction accuracy and meets the real-time and accuracy requirements of the actual production process on-site.

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“…These waves limit the minimal height of the cryolite layer that has a crucial impact on the energy consumption. For that reason, the MPR was intensively studied analytically and numerically in the last decades (Sneyd 1992;Sneyd and Wang 1994;Bojarevics and Romerio 1994;Davidson and Lindsay 1998;Lukyanov et al 2001) and still is subject of current research (Pedchenko et al 2009;Molokov et al 2011;Pedcenco et al 2017;Hua et al 2018). In the last few years, the MPR was further found to be a crucial limiting factor for the safe operation of physically similar LMBs.…”

Section: Introductionmentioning

confidence: 99%

Measurement of interfacial wave dynamics in orbitally shaken cylindrical containers using ultrasound pulse-echo techniques

2019

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We present a novel experiment on interfacial wave dynamics in orbitally shaken cylindrical vessels containing two-and three fluid layers. The experiment was designed as a hydrodynamical model for both aluminum reduction cells and liquid metal batteries to gain new insights into the rotational wave motion driven by the metal pad roll instability. Different options are presented to realize stable and measurable multi-layer stratifications. We introduce a new acoustic measurement procedure allowing to reconstruct wave amplitudes also in opaque liquids by tracking ultrasonic pulse echoes reflected on the interfaces. Measurements of resonance curves and phase shifts were conducted for varying interface positions. A strong influence of the top and bottom walls were observed, considerably reducing wave amplitudes and eigenfrequencies, when the interface is getting close. Finally, measured resonance curves were successfully compared with an existing forced wave theory that we extended to two-layer interfacial waves. The comparison stresses the importance to carefully control the boundary condition at the contact line.

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The Effect of “Wave Breakers” on the Magnetohydrodynamic Instability in Aluminum Reduction Cells

Cited by 13 publications

References 8 publications

Perturbation theory for metal pad roll instability in cylindrical reduction cells

Perturbation theory for metal pad roll instability in cylindrical reduction cells

Online Prediction Method of Molten Aluminium Height in Electrolytic Cell Based on Extreme Learning Machine with Kernel Function

Measurement of interfacial wave dynamics in orbitally shaken cylindrical containers using ultrasound pulse-echo techniques

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