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3769 |
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Thursday, May 22, 2014, Hall H2 4:00 PM Modeling & Simulation 2 |
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A three-dimensional analysis of the suspension plasma spray impinging on a flat substrate |
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Mehdi Jadidi* / Concordia University, Canada Farzad Jabbari / Department of Mechanical and Industrial Engineering, Concordia University, Canada Milad Mousavi/ Department of Mechanical and Industrial Engineering, Concordia University, Canada Sara Moghtadernejad/ Department of Mechanical and Industrial Engineering, Concordia University, Canada Ali Dolatabadi/ Department of Mechanical and Industrial Engineering, Concordia University, Canada |
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Suspension feedstock in plasma spraying is an emerging process for producing coatings with enhanced characteristics. Sub-micron up to few micron sized particles are suspended in a solvent and radially injected into the plasma plume. After the suspension undergoes breakup and evaporation, the molten and semi-molten fine particles are deposited on a substrate. Particle conditions upon impact (i.e. trajectory, velocity, and temperature) as well as the substrate location and shape have key influences on the adhesion and quality of the coatings. In this study, a three dimensional two-way coupled Eulerian-Lagrangian approach is used to model the plasma jet, droplet/particle trajectory, velocity, and temperature. To model the turbulence and the effect of substrate on the flow field, the Reynolds stress model (RSM) is used. Kelvin-Helmholtz Rayleigh-Taylor (KHRT) breakup model is utilized to predict the secondary breakup of suspension. The behavior of particles near the substrate is focused in this study. Substrates with different shapes placed at various stand-off distances from 3 to 7cm are modeled to provide detailed information on the coating particles in suspension plasma spraying. |