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Mullis, AM; McCarthy, IN; Cochrane, RF (2011)
Publisher: Elsevier
Languages: English
Types: Article
Subjects:

Classified by OpenAIRE into

arxiv: Physics::Fluid Dynamics
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.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • Anand, V., Kaufman, A.J. and Grant, N.J., 1978. Rapid solidification of a modified 7075 aluminium alloy by ultrasonic gas atomization. In: Rapid Solidification Processing, Principles & Technologies II (Eds. Robert Mehrabian, B. H. Kear, M. Cohen), Claitor, Baton Rouge, LA, pp. 273-286.
    • Anderson, I.E., Figliola, R.S. and Morton H., 1991. Flow mechanisms in high pressure gas atomization. Mater. Sci. Eng. A 148, 101-114.
    • Anderson, I.E., Peretti, M., Conin, J.A. and Figliola, R.S., 2006. Visualisation of enhanced primary atomization for powder size control. Proc. 3rd Int. Conf. on Spray Deposition and Melt Atomisation, Bremen, CD-proceedings.
    • Anderson, I.E. and Terpstra, R.L., 2002. Progress toward gas atomization processing with increased uniformity and control." Mater. Sci. Eng. A 326, 101-109.
    • Anderson, I.E., Terpstra, R.L., Figliola, R.S., 2004. Melt feeding and nozzle design modifications for enhanced control of gas atomisation, Advances in powder metallurgy and particulate materials. Adv. Powder Metall. Part. Mater., part 2, 26-36.
    • Bradley, D., 1973. On the atomisation of a liquid by high velocity gases: Parts 1 and 2. J. Phys. D: Appl. Phys. 6, 1724-1736 and 2267-2272.
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    • Mates, S.P. and Settles, G.S., 1996. High-Speed Imaging of Liquid Metal Atomization by Two Different Close-Coupled Nozzles. Adv. Powder Metall. Part. Mater., part 1, 67.
    • Mates, S.P. and Settles, G.S., 2005. A study of liquid metal atomization using close-coupled nozzles, Part 2: Atomization behaviour. Atomization and Sprays 15, 41-59..
    • McCarthy, I.N., Aslam, Z., Adkins, N.J., Mullis, A.M. and Cochrane, R.F., 2009. High speed imaging and Fourier analysis of the melt plume during close-coupled gas atomisation. Powder Metall. 52, 205-212.
    • McCarthy, I.N., 2010. Optical Investigations into Close-Coupled Gas Atomisation, PhD thesis, University of Leeds.
    • Miller, S.A., 1986. Apparatus for melt atomization with a concave melt nozzle for gas deflection, United States Patent 4619597.
    • Mullis, A.M., Adkins, N.J., Aslam, Z., McCarthy, I.N. and Cochrane, R.F., 2008. High frame rate analysis of the spray cone geometry during close-coupled gas atomization. Int. J. Powder Metall. 44, 55-64.
    • Nasr, G.G., Yule, A.J. and Bendig, L., 2002. Industrial sprays and atomisation design: Analysis and applications, Springer Publishing pp. 494.
    • Rana, D., Neale, G.H. and Hornof, V., 2002. Surface tension of mixed surfactant systems: lignosulfonate and sodium dodecyl sulfate. J. Colloid Polym. Sci. 280, 775-778.
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