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1246 |
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Wednesday, June 04, 2008, Auditorium 2 3:00 PM Cold Spraying 3 Everything around this young thermal spraying technique, possible applications and latest developments for equipment of high pressure and low pressure cold spraying, models and simulations for a deeper process knowledge |
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A combined numerical and experimental analysis of the cold spray process |
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Ali Dolatabadi* / Concordia University, Canada Babak Samareh / Concordia University, Canada Volkmar Luethen/ Siemens AG, Germany Oliver Stier/ Siemens AG, Germany |
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A high pressure Cold Gas Dynamic Spray (CGDS) nozzle with an axial powder feeder is simulated in this study. A two-way coupled Eulerian-Lagrangian scheme is used to obtain the flow field as well as the interactions between the solid and the gas phase. Various inlet conditions for the gas phase are considered to model both over-expanded and under-expanded flows. Various particle size and material are injected to the high speed flow field. In order to find the particle trajectory and impact velocity on the substrate, each particle is tracked individually. The validation experiments were performed for the majority of process parameters such as shock diamond formation, shock angle, location of Mach stem and bow shock on the substrate. The numerical results were found to be in good agreement with the experimental data. |