Permanent magnet dipole stirrer for aluminium furnaces

Beinerts, Toms; Bojarēvičs, Andris; Baranovskis, R.; Milgrāvis, Mikus; Kaldre, Imants

doi:10.1088/1757-899x/424/1/012037

Cited by 5 publications

(5 citation statements)

References 5 publications

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“…Vortex flow could be advantageous if particles are already in the melt volume and improved particle distribution is necessary. Both stirring patterns are discussed in our previous work [39,40,42].…”

Section: Solid State Phenomena Vol 332mentioning

confidence: 83%

“…[38] The most well-known are stirrers that generate alternating magnetic fields by powerful AC inductors which are located under the furnace. Authors have already shown that rotating permanent magnet dipoles can be used for necessary field generation instead of AC inductors [39,40] stirring has several advantages compared to mechanical stirring: stirring is done without a direct contact with the melt i.e. contactless; liquid metal surface deformations can be limited; equipment has low wear and low maintenance; the method is scalable; the method can be integrated in other technological processes, for example, casting process.…”

Section: Description Of the Proposed Methodsmentioning

confidence: 99%

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Electromagnetic Methods for Production of Aluminium Metal Matrix Composites

Milgrāvis

Kronkalns

Nikoluskins

et al. 2022

SSP

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Aluminium metal matrix composites (AMC) are perspective materials for a wide range of applications in automotive, aerospace and other industries where material mechanical properties and weight ratio is crucial. In AMC manufacturing through metallurgical process the main obstacle for particle introduction into the melt is poor particle wettability and their tendency to form agglomerates due to van der Waals and interfacial forces. Most of currently used AMC manufacturing methods through metallurgical route are effective only for small quantities or are time consuming, even though metallurgical AMC production route would promise significant cost savings. In this study we propose a permanent magnet stirring technology developed by IP UL as tool for alternative realization of stir- and compo-casting methods for AMC production. First results of contactless stirred semi-solid aluminium alloys show effective alloy stirring in melt volume and intense surface deformations that can break the oxide layer and stir in the reinforcement material from the melt surface.

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Section: Solid State Phenomena Vol 332mentioning

confidence: 83%

Section: Description Of the Proposed Methodsmentioning

confidence: 99%

Electromagnetic Methods for Production of Aluminium Metal Matrix Composites

Milgrāvis

Kronkalns

Nikoluskins

et al. 2022

SSP

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“…However, their performance deteriorates rapidly as the wall thickness increases. In contrast, the magnetic dipole configuration performs significantly better for thick walls commonly found in aluminum foundries [10,11]. This can be attributed to the slower decay of the dipole field with distance compared to the multi-pole field.…”

Section: Introductionmentioning

confidence: 95%

“…The volume force, denoted as F, was computed using a finite element solver implemented in the Elmer version 9.0 open-source software (Available at http://www.elmerfem.org/, accessed on 1 September 2022). Within Elmer, the built-in time-harmonic solver known as "WhitneyAVHarmonicSolver" was employed to determine the current density J and magnetic vector potential A, following the equation system (11).…”

Section: Numerical Simulationmentioning

confidence: 99%

Permanent Magnet Pump for Aluminum Transport in a Linear Channel

Gaile

Berenis

Kalvāns

et al. 2023

Metals

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Electromagnetic systems designed for liquid metal transportation offer a wide range of promising applications within the metallurgical industry. Among these systems, permanent magnet pumps stand out due to their remarkable advantages in processing liquid aluminum. These pumps enable the generation of a vigorous flow of liquid metal, all while maintaining a non-contact approach by bypassing the insulating walls. In this study, we investigate the flow of liquid metal in a rectangular cross-section channel created by a permanent magnet pump. To comprehensively analyze the flow characteristics and assess the technology's scalability, we employ order of magnitude evaluations alongside an experimental model. Ultrasound Doppler velocimetry is utilized to measure the velocity distribution, which reveals an intriguingly asymmetric flow pattern. Furthermore, additional measurements are conducted to determine the integral flow rate and pressure difference. Remarkably, the numerical simulations align closely with the experimental results, demonstrating good agreement in the p-Q curves. These findings provide substantial evidence supporting the remarkable potential of this technology in various applications, such as aluminum degassing, particle agglomerate dispersion, and efficient transportation.

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“…Moreover, owing to the small thickness of the metal layer, stirring the metal with the rotating magnetic field [35] is unfeasible owing to the unfavorable current distribution that arises in the case of high aspect ratios of diameter and thickness. Therefore instead of time-varying radial field [2,5], the proposed setup uses a time-varying axial magnetic field component to drive the metal flow; in this regard, it is similar to a centrifugal electromagnetic pump [11]. Lastly, we analyzed the created flow in the context of a degassing process; that is, we examined the feasibility of bubble disintegration by measuring and calculating velocity distribution.…”

Section: Introductionmentioning

confidence: 99%

Contactless Aluminum Degassing System—GaInSn Model Experiments and Numerical Study

Baranovskis

Berenis

Grants

et al. 2021

J. Sustain. Metall.

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Hydrogen dissolves in molten aluminum and it is essential to reduce hydrogen concentration before making aluminum product. We propose a novel contactless degassing method that uses electromagnetic forces to drive the melt flow and split the injected inert gas bubbles. A numerical and experimental model of the proposed system were studied with a focus on characterizing permanent magnet-driven flows. For solving the multiphysics problem numerically, we coupled OpenFoam for hydrodynamic calculations and Elmer for electromagnetic calculations. The velocity field and developed pressure in a laboratory-scale physical model built using GaInSn in different operating regimes were examined and compared with the numerical model predictions. To characterize the conditions for bubble collapse, velocity pulsations were measured, and turbulence generation rate was computed. The results verify the feasibility of scaling the proposed degassing system. By implementing this gas purging method, the need of a rotating impeller and its associated problems would be eliminated.

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Permanent magnet dipole stirrer for aluminium furnaces

Cited by 5 publications

References 5 publications

Electromagnetic Methods for Production of Aluminium Metal Matrix Composites

Electromagnetic Methods for Production of Aluminium Metal Matrix Composites

Permanent Magnet Pump for Aluminum Transport in a Linear Channel

Contactless Aluminum Degassing System—GaInSn Model Experiments and Numerical Study

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