Numerical investigations on cold gas dynamic spray process with nano- and microsize particles

Tien Chien Jen, Longjian Li, Wenzhi Cui, Qinghua Chen, Xinming Zhang

Research output: Contribution to journalArticlepeer-review

93 Citations (Scopus)

Abstract

The particle velocity in cold gas dynamic spraying (CGDS) is one of the most important factors that can determine the properties of the bonding to the substrate. In this paper, the acceleration process of microscale and sub-microscale copper (Cu) and platinum (Pt) particles inside and outside De-Laval-Type nozzle is investigated. A numerical simulation is performed for the gas-particle two phase flow with particle diameter ranging from 100 nm to 50 μm, which are accelerated by carrier gas nitrogen and helium in a supersonic De-Laval-type nozzle. The carrier gas velocity and pressure distributions in the nozzle and outside the nozzle are illustrated. The centerline velocity for two types of particles, Pt and Cu, are demonstrated. It is observed that the existence of the bow shocks near the substrate prevents the smaller size particles (less than 0.5 μm) from penetrating, thus leads to poor coating in the actual practices. Furthermore, the extended straight section may have different optimal length for different size particles, and even may be unnecessary for sub-microsize particles.

Original languageEnglish
Pages (from-to)4384-4396
Number of pages13
JournalInternational Journal of Heat and Mass Transfer
Volume48
Issue number21-22
DOIs
Publication statusPublished - Oct 2005
Externally publishedYes

Keywords

  • Cold gas dynamic spraying (CGDS)
  • Micro- and sub-microsize particles
  • Numerical simulation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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