Mullis, AM and Dunkley, JJ (2016) Analysis of acoustic emissions from gas atomisation. In: Blais, C and Hamilton, J, (eds.) Advances in Powder Metallurgy & Particulate Materials - 2016: Proceedings of the 2016 International Conference on Powder Metallurgy & Particulate Materials. Advances in Powder Metallurgy and Particulate Materials 2016, 05-09 Jun 2016, Boston MA. Metal Powder Industries Federation ISBN 978-1-943694-11-2
Abstract
It is well known that during close-coupled gas atomization introduction of the melt into the gas stream affects the emitted noise. However, there has been virtually no study of this ‘acoustic signature’. In this paper we present a quantitative comparison of this acoustic signature for an atomizer under gas only and gas + melt flow. We find that upon introduction of the melt there is strong absorption of frequencies in the 1-8 kHz range. These frequencies are characteristic of the resonance of droplets with 150-600 m diameters and may be indicative of the dynamics of the initial breakup of melt ligaments. Moreover, during atomisation we find that there are considerable low frequency (< 30 Hz) fluctuations in the intensity of the acoustic emissions. We show this may be related to atomizer pulsation, the quasi-periodic low frequency variation in the melt volume instantaneously at the atomizer tip.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 Metal Powder Industries Federation. This is an author accepted version of a paper published in Advances in Powder Metallurgy & Particulate Materials - 2016: Proceedings of the 2016 International Conference on Powder Metallurgy & Particulate Materials. |
Keywords: | Gas Atomisation; Acoustic Emission |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) > Institute for Materials Research (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 04 Aug 2016 15:12 |
Last Modified: | 16 Jan 2018 13:34 |
Status: | Published |
Publisher: | Metal Powder Industries Federation |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:103272 |