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A Three-Dimensional Analysis of the Cold Spray Process: The Effects of Substrate Location and Shape

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Abstract

A three-dimensional model of a Cold Gas Dynamic Spray system with a peripheral nonaxisymmetric powder feeder is studied in this work. It is found that the stagnation pressure alternates for different substrate standoff distances due to the nature of the supersonic flow interaction with the substrate. One can find the optimum substrate location for any given operating condition, which results in minimum pressure buildup on the substrate. The three-dimensional analysis sheds more light on the complex gas and particle flow fields generated due to the three-dimensional particle injection process. In addition, the three-dimensional model allows us to further investigate the effect of practical substrate shapes (such as convex and concave) on the flow field and consequently to determine the optimum conditions to deposit coating particles.

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Abbreviations

A :

Cross-sectional area of the particle, m2

C D :

Drag coefficient

D :

Particle diameter, m

F b :

Body force, N

Ma :

Mach number

m :

Mass, kg

R :

Specific gas constant, J/kg K

Re :

Reynolds number

T :

Temperature, K

t :

Time, s

V :

Velocity vector, m/s

ρ:

Density, kg/m3

γ:

Specific heat ratio

μ:

Molecular viscosity, kg/m s

p:

Particle

g:

Gas

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Acknowledgments

The authors would like to thank Drs. E. Irissou and C. Moreau from National Research Council Canada-Industrial Materials Institute (NRC-IMI) for their technical support. This work was financially supported by the Natural Sciences and Engineering Research Council Canada (NSERC) and Le Fonds québécois de la recherche sur la nature et les technologies (FQRNT).

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Authors and Affiliations

  1. Department of Mechanical and Industrial Engineering, Concordia University, EV004.139, 1455 de Maisonneuve Blvd., Montreal, QC, Canada, H3G 1M8

    B. Samareh & A. Dolatabadi

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  1. B. Samareh
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  2. A. Dolatabadi
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Correspondence to A. Dolatabadi.

Additional information

This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain Montavon, Ed., ASM International, Materials Park, OH, 2007.

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Samareh, B., Dolatabadi, A. A Three-Dimensional Analysis of the Cold Spray Process: The Effects of Substrate Location and Shape. J Therm Spray Tech 16, 634–642 (2007). https://doi.org/10.1007/s11666-007-9082-z

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