TY - GEN
T1 - Optimization of cold gas dynamic spray processes by computational simulation
AU - Takana, Hidemasa
AU - Shoji, Tetsuo
AU - Ogawa, Kazuhiro
AU - Nishiyama, Hideya
PY - 2007/12/1
Y1 - 2007/12/1
N2 - 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, thermophores is 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.
AB - 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, thermophores is 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.
KW - Cold gas dynamic spray
KW - Computational simulation
KW - Nano-micro particle
KW - Shock wave
KW - Substrate interactions
KW - Supersonic jet
UR - http://www.scopus.com/inward/record.url?scp=40449111014&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=40449111014&partnerID=8YFLogxK
U2 - 10.1115/FEDSM2007-37081
DO - 10.1115/FEDSM2007-37081
M3 - Conference contribution
AN - SCOPUS:40449111014
SN - 0791842886
SN - 9780791842881
T3 - 2007 Proceedings of the 5th Joint ASME/JSME Fluids Engineering Summer Conference, FEDSM 2007
SP - 1569
EP - 1577
BT - 2007 Proceedings of the 5th Joint ASME/JSME Fluids Engineering Summer Conference, FEDSM 2007
T2 - 2007 5th Joint ASME/JSME Fluids Engineering Summer Conference, FEDSM 2007
Y2 - 30 July 2007 through 2 August 2007
ER -