TY - GEN
T1 - The effects of the distance between nozzle and substrate on cold gas dynamic spray process
AU - Li, Longjian
AU - Chen, Qinghua
AU - Cui, Wenzhi
AU - Jen, Tien Chien
AU - Yen, Yi Hsin
AU - Liao, Quan
AU - Zhu, Lin
PY - 2010
Y1 - 2010
N2 - In this paper, numerical simulations were performed for the gas-particle two phase flow in the Cold Gas Dynamic Spray (CODS) process to investigate the acceleration of microand nanoparticles with diameters ranging from lOOnm to 50μm. Nitrogen (N2) and Helium (He) were chosen as the carrier gas, respectively. The acceleration of carrier gas to particles in the De-Laval-Type supersonic nozzle was strongly dependent on the characteristics of flow field, as well as the densities and the size of the particles. Copper particles (Cu) were chosen as the spraying materials. The computed results showed that the flow structures of the carrier gas were very different for different gas and different spraying distance, which resulted in consequently different accelerating features. The cone-shape weak shocks (compression waves) occurred at the exit of divergent section, and the bow-shaped strong shock wave was found right before the substrate, which played a resistance role to the particles and prevented the smaller particles from approaching on the substrate.
AB - In this paper, numerical simulations were performed for the gas-particle two phase flow in the Cold Gas Dynamic Spray (CODS) process to investigate the acceleration of microand nanoparticles with diameters ranging from lOOnm to 50μm. Nitrogen (N2) and Helium (He) were chosen as the carrier gas, respectively. The acceleration of carrier gas to particles in the De-Laval-Type supersonic nozzle was strongly dependent on the characteristics of flow field, as well as the densities and the size of the particles. Copper particles (Cu) were chosen as the spraying materials. The computed results showed that the flow structures of the carrier gas were very different for different gas and different spraying distance, which resulted in consequently different accelerating features. The cone-shape weak shocks (compression waves) occurred at the exit of divergent section, and the bow-shaped strong shock wave was found right before the substrate, which played a resistance role to the particles and prevented the smaller particles from approaching on the substrate.
KW - Cold gas dynamic spray
KW - Gas-particle two phase flow
KW - Numerical modeling
KW - Supersonic flow
UR - http://www.scopus.com/inward/record.url?scp=77954287112&partnerID=8YFLogxK
U2 - 10.1115/IMECE2009-10501
DO - 10.1115/IMECE2009-10501
M3 - Conference contribution
AN - SCOPUS:77954287112
SN - 9780791843826
T3 - ASME International Mechanical Engineering Congress and Exposition, Proceedings
SP - 2043
EP - 2048
BT - Proceedings of the ASME International Mechanical Engineering Congress and Exposition 2009, IMECE 2009
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2009 International Mechanical Engineering Congress and Exposition, IMECE2009
Y2 - 13 November 2009 through 19 November 2009
ER -