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Numerical and Experimental Study of Shielding Gas Orientation Effects on Particle Stream Concentration Mode in Coaxial Laser Aided Material Deposition Process

[+] Author Affiliations
Heng Pan, Yogesh D. Thakar, Frank Liou

University of Missouri at Rolla, Rolla, MO

Paper No. DETC2004-57049, pp. 21-27; 7 pages
doi:10.1115/DETC2004-57049
From:
  • ASME 2004 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 1: 30th Design Automation Conference
  • Salt Lake City, Utah, USA, September 28–October 2, 2004
  • Conference Sponsors: Design Engineering Division and Computers and Information in Engineering Division
  • ISBN: 0-7918-4694-6 | eISBN: 0-7918-3742-4
  • Copyright © 2004 by ASME

abstract

Laser aided deposition quality largely depends on the powder stream structure below the nozzle. Modeling of the powder concentration distribution rarely relies on the numerical approach partially due to the complex phenomenon involved in the two-phase turbulence flow. In this paper, a numerical model is introduced to predict the particle-gas flow precisely and economically in order to meet the practical requirement for coaxial nozzle design optimizations. This model is able to quantitatively predict the powder stream concentration mode under different outer shielding gas directions and inner/outer gas velocity ratio. The numerical simulation results are compared with the experimental study using prototyped coaxial nozzles. The results are found to match. This study shows that the particle concentration mode is influenced significantly by the outer gas direction and gas flow settings.

Copyright © 2004 by ASME

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