Modelling Powder Concentration Distribution From a Coaxial Deposition Nozzle for Laser-Based Rapid Tooling

[+] Author and Article Information
Andrew J. Pinkerton, Lin Li

Laser Processing Research Centre, Department of Mechanical, Aerospace and Manufacturing Engineering, UMIST, Manchester M60 1QD, United Kingdom

J. Manuf. Sci. Eng 126(1), 33-41 (Mar 18, 2004) (9 pages) doi:10.1115/1.1643748 History: Received June 01, 2003; Online March 18, 2004
Copyright © 2004 by ASME
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Modelled changes in (a) attenuation factor and (b) laser beam intensity along the axis of at coaxial deposition head with different powder injection angles
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Modelled variations in axial powder concentrations with different coaxial powder injection angles. (a) constant powder outlet passage diameter, (b) constant maximum powder concentration point, (c) as (b) and also maintaining a constant powder outlet area.
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Modelled and experimental axial powder concentrations
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A comparison of (a) modelled powder concentration distributions in different transverse planes and (b) images of the powder flow, below a coaxial nozzle
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The normalized luminence along the central axis below a coaxial nozzle with substrate displacement of (a) 20.5 mm, (b) 25.5 mm, (c) 30.5 mm and (d) 35.5 mm
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The normalized luminence in the radial (transverse) direction across (a) initial and (b) consolidated powder streams from a coaxial nozzle
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Schematic diagram of the conventional coaxial laser deposition nozzle used
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Schematic diagram of the experimental apparatus used for flow visualization and measurement
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Diagram of the model formulation in the axial plane



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