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2023 | OriginalPaper | Chapter

Modelling Contactless Ultrasound Treatment in a DC Casting Launder

Authors : Christopher Beckwith, Georgi Djambazov, Koulis Pericleous

Published in: Light Metals 2023

Publisher: Springer Nature Switzerland

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Abstract

Ultrasonic processing can be performed without a vibrating probe by electromagnetic induction with a suitable frequency where resonance conditions can be established. This contactless method is suitable for high-temperature or reactive metal alloys providing purity of the melt and durability of the equipment. Hydrogen bubbles coming out of solution grow by rectified diffusion, and larger bubbles escape from the top surface leading to degassing. Violent collapses of the remaining smaller bubbles help grain refinement. In this study, the application of a contactless ‘top-coil’ device to continuous casting via a launder is considered. Resonance is achieved by the positioning of baffles on either side of the coil. Electromagnetic forces also cause strong stirring, increasing residence time. The process is modelled using time domain and frequency domain methods, and results for the proposed setup are compared with data obtained for the immersed sonotrode. Accuracy and sensitivity to process and model parameters are discussed.

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previous chapter A Cellular Automaton Model for Qualifying Current Grain Refiners and Prescribing Next-Generation Grain Refiners for Aluminium Alloys

next chapter Numerical Analysis of Channel-Type Segregations in DC Casting Aluminum Slab

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Title: Modelling Contactless Ultrasound Treatment in a DC Casting Launder
Authors: Christopher Beckwith
Georgi Djambazov
Koulis Pericleous
Publisher: Springer Nature Switzerland
Book: Light Metals 2023
Print ISBN: 978-3-031-22531-4

Electronic ISBN: 978-3-031-22532-1

Copyright Year: 2023
DOI: https://doi.org/10.1007/978-3-031-22532-1_131

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