Resonant oscillation of a liquid metal column driven by electromagnetic Lorentz force sources

Makarov, Sergey N.; Ludwig, Reinhold; Apelian, Diran

doi:10.1121/1.426826

Cited by 7 publications

(3 citation statements)

References 23 publications

(25 reference statements)

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“…Such systems are common in the field of aeroacoustics of turbulent media and beyond. Similar set-up involving oscillations in liquid metal was studied by Makarov et al [14].…”

Section: Discussionmentioning

confidence: 72%

Weakly nonlinear oscillations of gas column driven by self-sustained sources

2019

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Self-sustained sources coupled to some sort of resonator have drawn attention recently as a subject of nonlinear dynamics with many practical applications as well as interesting mathematical problems from the chaos theory and the theory of synchronizations. In order to mimic the self-sustainability arising from physical background the van der Pol equation is commonly used as a model (e.g. vortex induced noise, flowstructure interactions, vocal folds motion etc.). In many cases the sound field inside the resonator is strong enough for weakly nonlinear formulation based on the Kuznetsov model equation to be employed. An array of sources governed by the inhomogeneous van der Pol equation coupled to the nonlinear acoustic wave equation is studied. The one dimensional constant cross-section open resonator with zero radiation impedance is assumed. The focus is on the main features such as mode-locking, harmonics generation and build-up from infinitesimal fluctuations.

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“…Such systems are common in the field of aeroacoustics of turbulent media and beyond. Similar set-up involving oscillations in liquid metal was studied by Makarov et al [14].…”

Section: Discussionmentioning

confidence: 72%

Weakly nonlinear oscillations of gas column driven by self-sustained sources

2019

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“…Molten Al often also contains various non-metallics inclusions, such as: oxides, nitrides, carbides, borides, chlorides, fluorides and molten salts [19][20], which have poor wettability with Al melt [21]. These inclusions can be exogenous (entrapped inclusions) or endogenous (form within the melt upon solidification or melt treatment).…”

Section: Impuritiesmentioning

confidence: 99%

Control and Removal of Impurities from Al Melts: A Review

Dewan

Rhamdhani

Mitchell

et al. 2011

MSF

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Control of impurity elements in Al-based alloys is of increasing technological importance, both in primary and secondary alloy production. In primary alloy production, Ni and V concentrations in the coke are rising and this is increasing the level of impurities in the final products to the extent that they are out of specification. Impurity control is also of concern in recycling due to the pickup of elements such as Fe from contaminants in the scrap, which can detrimentally affect the alloy properties. Dissolved elemental impurities can be removed by a number of different processes including boron treatment for some of the transition metals. Other processes in the cast shop for removing impurities and inclusions from Al melts include fluxing, floatation, and filtration. Gas purging, vacuum treatment, filtration, the use of salts, and combinations of these presently find commercial applications. Ultra purity Al and its alloys can be obtained using zone refining and three-layer electrolysis methods. The demand for higher purity Al has been largely met by additional electrolytic refining processes. This paper reviews the tools that are currently available to the casthouse for removing impurities and inclusions from Al melts and suggests approaches that may be useful to meet future challenges.

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“…The second method is to shake the liquid melt surface at about 16-30 Hz (figure 5(b)). This can be accomplished with an AC current of the same frequency flowing through the channel, superimposed on the DC component (see [20]). An additional periodic Lorentz force component appears in the transverse direction, which produces surface vibration.…”

Section: Surface Treatmentmentioning

confidence: 99%

Electromagnetic visualization technique for non-metallic inclusions in a melt

Makarov

Ludwig

Apelian

1999

Meas. Sci. Technol.

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The detection of inclusions in hot melts is of great importance to the manufacturing process as every aspect of quality is affected by the presence of second phases. However, the major dilemma is how to quantitatively determine the level of inclusions. In this paper, we present a theoretical model and preliminary experimental results of a Lorentz-force-based detection system to monitor small inclusions of micron size. The developed technique potentially has a better resolution performance than other on-line methods. The application area includes hot melts of metals and other highly conductive non-transparent fluids. Low-temperature modelling with liquid gallium was used to prove the measurement concept.

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Resonant oscillation of a liquid metal column driven by electromagnetic Lorentz force sources

Cited by 7 publications

References 23 publications

Weakly nonlinear oscillations of gas column driven by self-sustained sources

Weakly nonlinear oscillations of gas column driven by self-sustained sources

Control and Removal of Impurities from Al Melts: A Review

Electromagnetic visualization technique for non-metallic inclusions in a melt

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