Numerical Investigation of Particle Tracking to Achieve
High Impact Velocity in Cold Spray
Volume 2 - Issue 4
Muhammad Sohail Malik1*, Mona Azhar Khan2, Muhammad Suleman1, Ghulam Hussain1, Ramzan Abdul Karim1and Khurram Munir2
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- 1Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Pakistan
- 2School of Engineering, RMIT University, Australia
*Corresponding author:
Muhammad Sohail Malik, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Swabi,
Pakistan
Received: July 20, 2020; Published: July 29, 2020
DOI: 10.32474/ARME.2020.02.000145
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Abstract
Cold spray is a coating technique that allows for solid state deposition of particles under atmospheric conditions of pressure and
temperature. In cold spray micron size particles are impinged upon a substrate as a result of high velocity impact. The acceleration of
particles to a high velocity is achieved by expanding a pressurized gas in a supersonic convergentdivergent nozzle. The performance
of cold spray technique can be judged by several parameters, one of which is the deposition efficiency based on impact velocity.
It is observed in this work that particles having small diameters achieve high velocities during nozzle acceleration, but they also
decelerate rapidly in the flow downstream of the bow shock wave because of having low momentum. The main concern of this
paper was to examine the effect of particle size on impact velocity in the cold spray process and to find an optimum range of particle
diameter which could result in greater impact velocity at the given conditions. For this purpose, Zinc particles having diameters
range (1-50) microns were used to simulate in a supersonic nozzle numerically.
Keywords: Cold gas dynamic spraying (CGDS); Impact velocity; Deposition Criteria; Critical velocity; Particle impact temperature;
Computational fluid dynamics (CFD)
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