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Contribution à l’étude de l’atomisation assistée d’un liquide : instabilité de cisaillement et génération du spray

Abstract : Assisted atomization is a process used to form a spray of droplets. A slow liquid phase is strippedby the action of a strong gas current in order to generate the spray. This process is used in manyindustrial applications. We study the succession of hydrodynamic instabilities generating dropletsby means of a LIF method to measure the frequency and growthrate of waves, and with an opticalprobe to measure drop size and velocity. We validate experimentally a model including an interfacialvelocity deficit in the inviscid stability analysis. Experiments are compared to numerical simulationsand spatiotemporal stability analysis results : the confrontation of these three approaches is used tobring forward new mechanisms of destabilization, growth of waves and creation of drops. We assessthe influence of liquid thickness and dynamic pressure ratio on the dependency of the mean dropletdiameter with the Weber number.
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  • HAL Id : tel-01321846, version 1

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Sylvain Marty. Contribution à l’étude de l’atomisation assistée d’un liquide : instabilité de cisaillement et génération du spray. Mécanique des fluides [physics.class-ph]. Université Grenoble Alpes, 2015. Français. ⟨NNT : 2015GREAI122⟩. ⟨tel-01321846⟩

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