Thermal gradient in polymeric particles during the cold spray process

Understanding the particle history during the cold spray process is primordial to better apprehend the particle's mechanical behavior during the impact. If the particle velocity can easily be measured using a high-speed camera, measuring the particle temperature remains a challenge. A solution...

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Bibliographic Details
Published in:Computational particle mechanics 2023-11, Vol.10 (6), p.1697-1716
Main Authors: Bernard, C. A., Takana, H., Diguet, G., Lame, O., Ogawa, K., Cavaillé, J.-Y.
Format: Article
Language:English
Subjects:
Chemical and Process Engineering
Classical and Continuum Physics
Computational fluid dynamics
Computational Science and Engineering
Diameters
Engineering
Engineering Sciences
High speed cameras
Mechanical properties
Mechanics
Metal particles
Particle size
Rotating spheres
Simulation
Surface stability
Temperature distribution
Temperature gradients
Theoretical and Applied Mechanics
Thermal conductivity
Thermal stability
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Summary:Understanding the particle history during the cold spray process is primordial to better apprehend the particle's mechanical behavior during the impact. If the particle velocity can easily be measured using a high-speed camera, measuring the particle temperature remains a challenge. A solution is to perform numerical simulations of the process using computational fluid dynamics (CFD) simulations. However, most CFD simulation results only give an idea of the particle average temperature. Although it would be valid for metallic particles which exhibit a small temperature difference between the particle core and surface with high thermal stability, it is not the case for polymeric material, because of their low thermal conductivity. In this paper, the thermal gradient of a polymer particle is investigated. While small particles exhibit a uniform temperature distribution, a large temperature gradient is observed for particle diameter larger than 30 µm. In addition, assuming that the particle is spherical without rotation during the flight, the particle exhibits melting at the front. Such a phenomenon can have considerable consequences on the particle behavior during the impact. Furthermore, the influence of the feeding rate on the particle temperature distribution is investigated. If the particles are well diluted inside the nozzle (low feeding rate), the difference in the average temperature of two successive particles is limited to 5 K.
ISSN:2196-4378
2196-4386
DOI:10.1007/s40571-023-00583-0