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Contactless ultrasound generation in a crucible

Contactless ultrasound generation in a crucible

Bojarevics, Valdis, Djambazov, Georgi S. and Pericleous, Koulis A. ORCID: 0000-0002-7426-9999 (2015) Contactless ultrasound generation in a crucible. Metallurgical and Materials Transactions A, 46A (7). pp. 2884-2892. ISSN 1073-5623 (Print), 1543-1940 (Online) (doi:10.1007/s11661-015-2824-5)

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Abstract

Ultrasound treatment is used in light alloys during solidification to refine microstructure, remove gas, or disperse immersed particles. A mechanical sonotrode immersed in the melt is most effective when probe tip vibrations lead to cavitation. Liquid contact with the probe can be problematic for high temperature or reactive melts leading to contamination. An alternative contactless method of generating ultrasonic waves is proposed, using electromagnetic (EM) induction. As a bonus, the EM force induces vigorous stirring distributing the effect to treat larger volumes of material. In a typical application, the induction coil surrounding the crucible— also used to melt the alloy—may be adopted for this purpose with suitable tuning. Alternatively, a top coil, immersed in the melt (but still contactless due to EM force repulsion) may be used. Numerical simulations of sound, flow, and EM fields suggest that large pressure amplitudes leading to cavitation may be achievable with this method.

Item Type: Article
Additional Information: Made open access under the Seventh Research Framework Programme initiative.
Uncontrolled Keywords: Induction stirring, Ultrasonic processes, sound generation, resonance
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Faculty / Department / Research Group: Faculty of Architecture, Computing & Humanities
Faculty of Architecture, Computing & Humanities > Centre for Numerical Modelling & Process Analysis (CNMPA) > Computational Science & Engineering Group (CSEG)
Faculty of Architecture, Computing & Humanities > Department of Mathematical Sciences
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Last Modified: 02 May 2018 09:47
Selected for GREAT 2016: GREAT a
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/13722

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