NDLI: Numerical modeling of a low temperature high velocity air fuel spraying process with injection of liquid and metal particles

Content Provider	Springer Nature Link
Author	Yuan, X. Wang, H. Hou, G. Zha, B.
Copyright Year	2006
Abstract	An analysis of a low temperature high velocity air fuel (LTHVAF) thermal spray process is presented using computational fluid dynamics (CFD). The originality of the process lies in the injection of liquid (water) upstream of the powder injection to control to gas temperature and, therefore, the heat transfer to the injected particles. First, computation fluid dynamic techniques are implemented to solve the mass, momentum, and energy conservation equations in the gas phase. A turbulence model based on the renormalized group theory (RNG) is used for the turbulent flow field. The gas dynamic data are, then, used to model the behavior of the liquid droplets and particles in the gas flow field. The calculated results show that the liquid flow rate should range between 20 and 30 kg/h to achieve the optimal gas characteristics for particle treatment. They also show that particle velocity and temperature are strongly affected by particle size. At the gun exit, the particle velocity and temperature range between 700 and 300 m/s and between 900 and 400 K, respectively, for Cu and Ni particles with size distributions of 1 to 50 μm. As expected, the smaller particles have higher velocity and temperature. The metal coatings (Nickel and copper) produced by the LTHVAF spray process are characterized by low oxide content, low residual stresses, high deposition rates, and good bonding to the substrate.
Starting Page	413
Ending Page	421
Page Count	9
File Format	PDF
ISSN	10599630
Journal	Journal of Thermal Spray Technology
Volume Number	15
Issue Number	3
e-ISSN	15441016
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	computational fluid dynamics copper coatings high-velocity air fuel (HVAF) nickel coatings particle behavior Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings Materials Science Characterization and Evaluation of Materials Operating Procedures, Materials Treatment Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Materials Chemistry Condensed Matter Physics

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