Investigation of particle behavior at the stagnation zone for a suspension particle jet in plasma spray conditions

If the suspension plasma spray process is now emerging at industrial scale, there are still some open questions about the formation of coatings from the impact to the piling up of the fine particles. Furthermore, there are still concerns about the behavior of the suspension particles in the stagnation zone where the gas jet impinges on a solid surface. In this work, we experimentally observed the particle-laden jet streamlines near a surface using a particle image velocimetry technique and measured the impact velocities for different particle sizes. The effect of air jets used to cool down the substrate was also investigated.