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Three-Dimensional Modeling of Suspension Plasma Spraying with Arc Voltage Fluctuations

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Abstract

In this study, a three-dimensional DC plasma torch is modeled using Joule effect method to simulate the plasma jet and its voltage fluctuations. The plasma gas is a mixture of argon/hydrogen, and the arc voltage fluctuation is used as an input data in the model. Reynolds stress model is used for time-dependent simulation of the oscillating flow of the plasma gas interacting with the ambient air. The results are used to investigate the plasma oscillation effects on the trajectory, temperature, and velocity of suspension droplets. Suspensions are formed of ethanol and yttria-stabilized zirconia submicron particles and modeled as multicomponent droplets. To track the droplets/particles, a two-way coupled Eulerian–Lagrangian method is employed. In addition, in order to simulate the droplet breakup, Kelvin–Helmholtz/Rayleigh–Taylor (KH–RT) breakup model is used. After the completion of suspension breakup and evaporation, the sprayed particles are tracked to obtain the in-flight particle conditions including trajectory, size, velocity, and temperature. The arc voltage fluctuations were found to cause more than two times wider particle trajectories resulting in wider particle temperature, velocity, and size distributions compared with the case of constant voltage.

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Acknowledgments

The authors gratefully acknowledge the financial support from Natural Sciences and Engineering Research Council (NSERC) of Canada. This research was undertaken, in part, thanks to funding from the Canada Research Chairs Program.

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Authors and Affiliations

  1. Department of Mechanical, Industrial and Aerospace Engineering, Concordia University, Montreal, QC, Canada

    E. Dalir, C. Moreau & A. Dolatabadi

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  1. E. Dalir
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  2. C. Moreau
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  3. A. Dolatabadi
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Correspondence to A. Dolatabadi.

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Dalir, E., Moreau, C. & Dolatabadi, A. Three-Dimensional Modeling of Suspension Plasma Spraying with Arc Voltage Fluctuations. J Therm Spray Tech 27, 1465–1490 (2018). https://doi.org/10.1007/s11666-018-0783-2

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  • DOI: https://doi.org/10.1007/s11666-018-0783-2

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