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The Effects of the Distance Between Nozzle and Substrate on Cold Gas Dynamic Spray Process

[+] Author Affiliations
Longjian Li, Qinghua Chen, Wenzhi Cui

Chongqing University, Chongqing, China

Tien-Chien Jen, Yi-Hsin Yen, Quan Liao, Lin Zhu

University of Wisconsin-Milwaukee, Milwaukee, WI

Paper No. IMECE2009-10501, pp. 2043-2048; 6 pages
doi:10.1115/IMECE2009-10501
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4382-6 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

In this paper, numerical simulations were performed for the gas-particle two phase flow in the Cold Gas Dynamic Spray (CGDS) process to investigate the acceleration of micro- and nanoparticles with diameters ranging from 100nm 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.

Copyright © 2009 by ASME
Topics: Nozzles , Sprays

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