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1997 |
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Tuesday, May 04, 2010, Hullet Room 11:00 AM Wear Protection 2 |
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PIV measurements of metallic powders produced by liquid metal atomization using laval nozzle |
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Othmane Khatim / LERMPS-UTBM, FRANCE Marie-Pierre Planche* / LERMPS-UTBM, FRANCE Yannick Bailly/ Institute FEMTO-ST/ENISYS, University of Franche-Comté , FRANCE François Guermeur/ Institute FEMTO-ST/ENISYS, University of Franche-Comté , FRANCE Lucas Dembinski/ LERMPS-UTBM, FRANCE Laurent Gerardot/ Institute FEMTO-ST/ENISYS, University of Franche-Comté , FRANCE Christian Coddet/ LERMPS-UTBM, FRANCE |
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Liquid metal atomization using de Laval nozzle is an established technique for producing fine (< 100 ìm) metal powders for a lot of industrial applications. This process offers a variety of advantages as spherical morphology or low consumption of inert gas for example. Despite its widespread uses, however, the relationships among gas dynamics melt nozzle and de Laval nozzle diameters, processing parameters, and particle size remain to be defined. As a result, efforts to reduce powder costs by improving particle size control and energy efficiency remain hindered. Then, the optimization of this process is a great challenge. This experimental study examines the atomizing spray behaviour depending on the process parameters. Experiments were conduced on copper (at 99.9%). Particle Image Velocimetry technique was implemented in the atomization chamber and measurements were performed to characterize the atomized droplets velocity. The PIV system was placed in such a way that the atomization zone, comprised between 5 and 11 cm downstream the de Laval nozzle exit, can be viewed by the camera. The evolutions of the particle velocity and particle sizes were finally analyzed versus the working conditions. |