An integrated model of compressible thermofluid, splat formation and coating formation for a cold dynamic spray process has been established. In-flight behavior of nano-micro particles and the interaction between the shock wave and the particles in a supersonic jet flow impinging onto the substrate and further particle acceleration with electrostatic force are clarified in detail by considering viscous drag force, flow acceleration, added mass, gravity, Basset history force, Saffman lift force, Brownian motion, thermophoresis and electrostatic force. The effect of electrostatic acceleration becomes more significant with the decrease in particle diameter even in the presence of unavoidable shock wave. As a result, electrostatic acceleration can broaden the application range of operating particle diameter in a cold gas dynamic spray process to form a robust and activated coating. Finally, based on the integrated model, the coating thickness characteristics in an electrostatic assisted cold dynamic spray process are evaluated.
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ASME/JSME 2007 5th Joint Fluids Engineering Conference
July 30–August 2, 2007
San Diego, California, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-4288-6
PROCEEDINGS PAPER
Optimization of Cold Gas Dynamic Spray Processes by Computational Simulation
Hidemasa Takana,
Hidemasa Takana
Tohoku University, Sendai, Miyagi, Japan
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Kazuhiro Ogawa,
Kazuhiro Ogawa
Tohoku University, Sendai, Miyagi, Japan
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Tetsuo Shoji,
Tetsuo Shoji
Tohoku University, Sendai, Miyagi, Japan
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Hideya Nishiyama
Hideya Nishiyama
Tohoku University, Sendai, Miyagi, Japan
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Hidemasa Takana
Tohoku University, Sendai, Miyagi, Japan
Kazuhiro Ogawa
Tohoku University, Sendai, Miyagi, Japan
Tetsuo Shoji
Tohoku University, Sendai, Miyagi, Japan
Hideya Nishiyama
Tohoku University, Sendai, Miyagi, Japan
Paper No:
FEDSM2007-37081, pp. 1569-1577; 9 pages
Published Online:
March 30, 2009
Citation
Takana, H, Ogawa, K, Shoji, T, & Nishiyama, H. "Optimization of Cold Gas Dynamic Spray Processes by Computational Simulation." Proceedings of the ASME/JSME 2007 5th Joint Fluids Engineering Conference. Volume 1: Symposia, Parts A and B. San Diego, California, USA. July 30–August 2, 2007. pp. 1569-1577. ASME. https://doi.org/10.1115/FEDSM2007-37081
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