Authors
Tien-Chien Jen, Longjian Li, Wenzhi Cui, Qinghua Chen, Xinming Zhang
Publication date
2005/10/1
Journal
International journal of heat and mass transfer
Volume
48
Issue
21-22
Pages
4384-4396
Publisher
Pergamon
Description
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 100nm to 50μm, 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 0.5μm) from penetrating, thus leads to poor coating in the actual practices …
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Scholar articles
TC Jen, L Li, W Cui, Q Chen, X Zhang - International journal of heat and mass transfer, 2005