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| Abstract No.: |
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Scheduled at:
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Thursday, June 08, 2017, Hall 28 10:00 AM
Modeling & Simulation I
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| Title: |
Interaction between rotary arc and injected particles in a non-transferred DC plasma spray with externally applied magnetic field
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| Authors: |
Hiroki Saito* / University of Tsukuba, Japan
Takayasu Fujino/ University of Tsukuba, Japan
Hidemasa Takana/ Tohoku University, Japan
Javad Mostaghimi/ University of Toronto, Canada
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| Abstract: |
The authors performed a time-dependent, three-dimensional numerical simulation of a non-transferred DC plasma spray with externally applied magnetic field. The characteristics of the magnetohydrodynamic (MHD) flow in the plasma production part of the spray were analyzed under different magnetic conditions. Compressible Navier-Stokes equations with MHD source terms and Maxwells equations were used as the governing equations. In this paper, distributions of Lorentz force acting on arc column between electrodes are focused on which are considered to be significant factor to drive the arc in the plasma torch. The thermal power efficiency for each current operating condition is also discussed. The interaction between the arc current and the coil magnetic field generates an arc rotational movement. The arc rotation increases the arc resistance and voltage drop. This increased power input produces higher enthalpy plasma jet, heating and accelerating injected particles more strongly. Lagrangian approach was used to track particles in plasma jet. Particle temperature and position distributions are shown in front of a substrate. The authors suggest more suitable operating conditions by numerical simulations for thermal plasma processing employing external magnetic field. The calculated voltage between electrodes and the thermal efficiency are compared with those obtained experimentally under particular operating conditions.
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