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Etude d'un jet d'azote supercritique utilisé dans un prototype industriel de traitement de surface à faible impact environnemental

Abstract : A new and efficient process of surface treatment is developed and exists in prototype form at present. The process aims at injecting an inert gas, such as nitrogen, at supercritical conditions through a nozzle. The jet resulting from the expansion of the fluid at high pressure and supercritical temperature impinges normally a flat surface. Alternatively to water jet technologies, which need expansive purification of water after use, and to other classical surface treatment process, this process provides environmental (no generation of additional waste), technical (action on the coating) and energetical (efficiency) benefits. However, the physical phenomena involved in the jet are still poorly understood at present. To understand and model these phenomena, numerical analysis is presented. This analysis is part of a study strategy that aims at gradually increasing the complexity of modeling. A first model aims at describing the evolution of the fluid in time and space, assuming a compressible axisymmetric viscous flow. In this model, the fluid is assumed perfect. A direct extension of this model is then presented where real fluid effects are taken into account in the compressible flow. These models are implemented in finite volume CFD code. Test cases are studied to validate the numerical models. A study of industrial-type configurations, representative of the conditions of use of the process of surface treatment by nitrogen is then conducted
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Patrice Dubs. Etude d'un jet d'azote supercritique utilisé dans un prototype industriel de traitement de surface à faible impact environnemental. Autre. Université Henri Poincaré - Nancy 1, 2010. Français. ⟨NNT : 2010NAN10121⟩. ⟨tel-01746333⟩

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