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| Abstract No.: |
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Scheduled at:
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Wednesday, May 11, 2016, Room 3G 12:00 PM
Modeling & Simulation I
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| Title: |
Three-dimensional modeling of arc voltage fluctuations in suspension plasma spraying
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| Authors: |
Elham Dalir* /
Department of Mechanical & Industrial Engineering, Concordia University
, Canada
Christian Moreau/ Department of Mechanical & Industrial Engineering, Concordia University, Canada
Ali Dolatabadi/ Department of Mechanical & Industrial Engineering, Concordia University, Canada
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| Abstract: |
Considering the high volume of plasma jet applications including plasma cutting, plasma spraying, and plasma arc waste disposal, realistic simulation of a plasma jet would significantly help to better understand and improve various processes. In this research, firstly a three-dimensional DC plasma torch considering the arc voltage fluctuation is modeled using Joule effect method to simulate the plasma jet. The plasma gas is a mixture of argon/helium and the arc voltage fluctuation is used as an input data in the model. Physical and chemical properties of plasma gases are used to model the plasma jet having high temperature and velocity. Large Eddy Simulation (LES) model is used for time dependent simulation of the mixing flow of the plasma gas with atmosphere. After modeling the plasma jet, 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 (YSZ, 8 wt. %) sub-micron particles and modeled as multicomponent droplets. To track the droplets and particles trajectory, a two-way coupling Eulerian-Lagrangian method is employed. In addition, to model the droplet breakup, Kelvin-Helmholtz Rayleigh-Taylor (KHRT) breakup model is used. After the completion of suspension breakup and evaporation, the spray particles are tracked through the domain to obtain the in-flight particles characteristics. The numerical results of suspension injection process are validated against the experimental results for the same operating conditions.
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