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Modeling the Interaction between a Thermal Flow and a Liquid: Review and Future Eulerian-Lagrangian Approaches

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Document pages: 22 pages

Abstract: Suspension Plasma Spraying is a complex process in which several physicalmechanisms play a part. So the modeling and understanding of the interactionbetween a high-velocity and thermal flow and a liquid precursor phase isof major importance concerning the control and characterization of theprocess. The liquid droplet size distribution has a high influence on the kineticproperties of the as-sprayed nanometer particles before impacting on a targetsubstrate. An overview of existing models is provided dealing with the penetrationof the liquid phase into the thermal flame and the resulting fragmentationand vaporization of this phase before impact. The physical characteristicsof the flow as well as existing Lagrangian and Eulerian modelingstrategies are briefly discussed while paying attention to the physical parameterscharacterized and measured by numerical simulation. The potential of thevarious models and also their limits are intended to be highlighted. Futurecoupled Eulerian-Lagrangian modeling strategies are also proposed for aglobal and more exhaustive representation of the injection, fragmentation anddispersion part of the two-phase gas-liquid flow before particle impact on thesubstrate.

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