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Multiphysics Modelling of Ultrasonic Melt Treatment in the Hot-Top and Launder during Direct-Chill Casting: Path to Indirect Microstructure Simulation

dc.contributor.authorChristopher Beckwith
dc.contributor.authorGeorgi Djambazov
dc.contributor.authorKoulis Pericleous
dc.contributor.authorTungky Subroto
dc.contributor.authorDmitry G. Eskin
dc.contributor.authorDan Roberts
dc.contributor.authorIvan Skalicky
dc.contributor.authorIakovos Tzanakis
dc.contributor.otherComputational Science and Engineering Group, University of Greenwich, 30 Park Row, London SE10 9LS, UK
dc.contributor.otherComputational Science and Engineering Group, University of Greenwich, 30 Park Row, London SE10 9LS, UK
dc.contributor.otherComputational Science and Engineering Group, University of Greenwich, 30 Park Row, London SE10 9LS, UK
dc.contributor.otherBrunel Centre for Advanced Solidification Technology (BCAST), Brunel University London, Uxbridge UB8 3PH, UK
dc.contributor.otherBrunel Centre for Advanced Solidification Technology (BCAST), Brunel University London, Uxbridge UB8 3PH, UK
dc.contributor.otherConstellium UTC, Brunel University London, Uxbridge UB8 3PH, UK
dc.contributor.otherConstellium UTC, Brunel University London, Uxbridge UB8 3PH, UK
dc.contributor.otherFaculty of Technology, Design and Environment, Oxford Brookes University, Oxford OX33 1HX, UK
dc.date.accessioned2025-10-09T05:30:47Z
dc.date.available2025-10-09T05:30:47Z
dc.date.issued01-04-2021
dc.identifier.urihttps://www.mdpi.com/2075-4701/11/5/674
dc.identifier.urihttp://digilib.fisipol.ugm.ac.id/repo/handle/15717717/41109
dc.description.abstractThis study concerns the numerical simulation of two competing ultrasonic treatment (UST) strategies for microstructure refinement in the direct-chill (DC) casting of aluminium alloys. In the first, more conventional, case, the sonotrode vibrating at 17.3 kHz is immersed in the hop-top to treat the sump melt pool, in the second case, the sonotrode is inserted between baffles in the launder. It is known that microstructure refinement depends on the intensity of acoustic cavitation and the residence time of the treated fluid in the cavitation zone. The geometry, acoustic field intensity, induced flow velocities, and local temperature are factors which affect this treatment. The mathematical model developed in this work couples flow velocity, acoustics modified by cavitation, heat transfer, and solidification at the macroscale, with Lagrangian refiner particles, used to determine: (a) their residence time in the active zones, and (b) their eventual distribution in the sump as a function of the velocity field. This is the first attempt at using particle models as an efficient, though indirect, alternative to microstructure simulation, and the results indicate that UST in the launder, assisted with baffle separators, yields a more uniform distribution of refining particles, avoiding the strong acoustic streaming jet that, otherwise, accompanies hot-top treatment, and may lead to the strong segregation of refining particles. Experiments conducted in parallel to the numerical studies in this work appeared to support the results obtained in the simulation.
dc.language.isoEN
dc.publisherMDPI AG
dc.subject.lccMining engineering. Metallurgy
dc.titleMultiphysics Modelling of Ultrasonic Melt Treatment in the Hot-Top and Launder during Direct-Chill Casting: Path to Indirect Microstructure Simulation
dc.typeArticle
dc.description.keywordsultrasonic processing
dc.description.keywordsDC casting
dc.description.keywordscavitation
dc.description.keywordsLagrangian tracking
dc.description.doi10.3390/met11050674
dc.title.journalMetals
dc.identifier.e-issn2075-4701
dc.identifier.oaioai:doaj.org/journal:4e735919200841abb9939d10af7f5052
dc.journal.infoVolume 11, Issue 5


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