Title:	New contactless aluminum degassing system - GaInSn model experiments with a numerical study
Authors:	Baranovskis, Reinis Berenis, Didzis Grants, Ilmars Bojarevics, Andris Beinerts, Toms
Citation:	Proceeding of UIE 2021: XIX International UIE Congress on Evolution and New Trends in Electrothermal Processes. 1.-3.2021, Pilsen, Faculty of Electrical Engineering, University of West Bohemia, Czech Republic, 2021, p. 21-22.
Issue Date:	2021
Publisher:	Faculty of Electrical Engineering, University of West Bohemia
Document type:	conferenceObject konferenční příspěvek
URI:	http://hdl.handle.net/11025/45754
ISBN:	978-80-261-0930-3
Keywords:	odplyňování hliníku;MHD modelování;experiment GaInSn;čerpadlo s permanentním magnetem;bublinkové proudění
Keywords in different language:	aluminum degassing;MHD modelling;GaInSn experiment;permanent magnet pump;bubble flow
Abstract in different language:	Molten aluminum in metallurgy environment col lects hydrogen from ambient air and water vapor thus after crys tallization causing porosity. Therefore hydrogen concentration must be reduced below a certain threshold before the final metal product is made. The most common way is gas purging when inert gas is injected in the melt which absorbs dissolved hydrogen and leaves the metal through the free surface. The existing meth ods need a mechanical contact with hot and chemically aggressive aluminum which leads to higher maintenance costs. We propose a novel contactless degassing method which uses electromagnetic forces to drive the flow and split the injected inert gas bubbles. Numerical analysis is used to study permanent magnet driven flows and to optimize the degassing process. The problem is solved by coupling OpenFoam for hydrodynamic calculations and Elmer for electromagnetic calculations. According to them, the most promising design is chosen for GaInSn experimental scale model (see Fig. 1). In experiments the velocity field and the developed pressure in different operating regimes has been obtained and later compered to the numerical model. Results show that the iron yokes can be used as a cost effective tool for magnetic flux concentrators even on rotating permanent magnet machinery providing at least a 30 % pressure increase. Overall, the system can achieve large velocities which when scaled to industrial sized setup would be sufficient for the argon dissipation to take place. The developed pressure head is high enough to lift aluminum several meters, allowing device to be integrated in a manufacturing line
Rights:	© IEEE
Appears in Collections:	UIE 2021 UIE 2021

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