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| Abstract No.: |
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| Title: |
Effects of momentum and heat transfer between plasma and suspensions on an axial injection plasma spraying
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| Authors: |
Takuya Suzuki / University of Tsukuba, Japan
Hiroki Saito / University of Tsukuba, Japan
Takayasu Fujino/ University of Tsukuba, Japan
Masato Suzuki/ National Institute of Advanced Industrial Science and Technology, Japan
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| Abstract: |
The authors conducted two-dimensional numerical simulations of plasma-suspension interaction in an axial injection DC plasma spray with an axisymmetric shape. A two-way coupled Eulerian-Lagrangian approach was used to simulate plasma flow and suspension behavior. Momentum transfer and energy transfer were chosen as effects of two-way interaction. In the plasma spray, a suspension feed rate is considered to influence both the plasma jet and the suspension. Therefore, it was parametrically changed in this study. Numerical simulations which neglect the plasma-suspension interaction were also conducted for the comparison. Numerical results show that the temperature of the plasma hot-core region along axisymmetric line decreases by injecting the suspension. A plasma jet velocity also decreases by injecting it. High injection rates of the suspension reduce the plasma jet temperature and velocity. Powder particles are adequately heated up to molten state for the low feeding rates. In the case of high feeding rates, there are some unmolten particles at the torch outlet due to a decline in heating capacity of the plasma jet under high feeding rates.
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