McCarthy, IN, Adkins, NJ, Aslam, Z et al. (2 more authors) (2009) High speed imaging and Fourier analysis of the melt plume during close coupled gas atomisation. Powder Metallurgy, 52 (3). 205 - 212. ISSN 0032-5899
Abstract
A high speed digital analysis technique has been used to study the atomisation plume of a superheated sample of Ni–Al in a close coupled gas atomiser. The atomisation, incorporating a generic melt nozzle and die design was captured using a Kodak high speed digital analyser at a frame rate of 18 k frames per second. The resulting 65 536 frames were then analysed using a specially designed routine, which calculates values of optical brightness and position of the intensity maximum for all frames and performs Fourier analysis on the sequence. The data produced from this analysis show that the plume, pulses at low frequencies (<25 Hz) and precesses at higher frequencies (∼360 Hz) around the atomiser's centreline. To aid investigation into the origins of this precession and other phenomena it was decided to conduct further experiments using an analogue system. The analogue atomiser reproduces the important features of the full atomiser but instead of atomising molten metal, the analogue system atomises water, providing a quick and easy way of testing the effects of changing parameters. Using this system it was found that the precession of the melt plume is independent of the atomiser's gas inlet pressure but strongly dependent on both the die and melt nozzle's geometry.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2009, Maney Publishing. This is an author produced version of a paper published in Powder Metallurgy Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Close coupled gas atomisation; high frame rate image capture; gas plume; atomisation nozzle geometry; fourier analysis; Ni-Al |
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: | 01 May 2015 14:20 |
Last Modified: | 20 Jan 2018 17:36 |
Published Version: | http://dx.doi.org/10.1179/174329409X409549 |
Status: | Published |
Publisher: | Maney Publishing |
Identification Number: | 10.1179/174329409X409549 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:84393 |