High speed imaging of the flow during close-coupled gas atomisation: Effect of melt delivery nozzle geometry
Mullis, AM, McCarthy, IN and Cochrane, RF
(2011)
High speed imaging of the flow during close-coupled gas atomisation: Effect of melt delivery nozzle geometry.
Journal of Materials Processing Technology, 211 (9).
1471 - 1477.
ISSN 0924-0136
Abstract
We describe the application of a high-speed still imaging technique to the study of close-coupled gas atomisation. A pulsed Nd:YAG laser is used to obtain pairs of still images with an effective 6 ns exposure time, from which velocity maps of the flow of the atomised fluid can be reconstructed. We demonstrate directly that the melt spray cone consists of a jet precessing around the surface of a cone. Further, we demonstrate that the width of this jet is directly related to the geometry of the melt nozzle. By applying Particle Image Velocimetry techniques we are also able to map the flow field in both the primary and secondary atomisation zones, demonstrating an asymmetric recirculation eddy exists at the circumferential edge of the gas-melt interface in the primary atomisation zone.
Metadata
Authors/Creators:
Mullis, AM
McCarthy, IN
Cochrane, RF
Copyright, Publisher and Additional Information:
(c) 2011, Elsevier. NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Materials Processing Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Materials Processing Technology, 211, 9, 2011. 10.1016/j.jmatprotec.2011.03.020
Keywords:
Gas atomisation; Discrete Fourier transform; Metal Atomization; Particle Image Velocimetry; Performance
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