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IRSN, Institut de radioprotection et de sûreté nucléaire

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Enhancing Nuclear Safety


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Etude de la mise en suspension d'un aérosol de microgouttelettes lors de l'impact de gouttes millimétriques sur un film liquide


Congress title :CFA 2007/2008 - 23ème Congrès Français sur les Aérosols
Congress location :Paris
Congress date :16/01/2008

Document type > *Congrès/colloque

Keywords >

Research Unit > IRSN/DSU/SERAC/LPMA

Authors > GEHIN Evelyne, GENSDARMES François, MOTZKUS Charles

Publication Date > 17/01/2008

Summary

The safety analyses of the nuclear facilities require extensive knowledge on the airborne micro-droplets emitted, in order to assess the potential sources of contamination in the case of hypothetical scenarios of accidental falls of liquids caused by leakage from a container. There are very few data in the literature in the case of the impaction of millimeter-size droplets. The purpose of our work is to study experimentally the particle emission during the impaction of droplets onto a liquid film. Experiments were conducted to study the influence of the velocity and the diameter droplets, the height of the liquid film, the surface tension and viscosity of the liquid on the airborne particles. Our results, original, have made it possible to examine the relevance of existing relations, describing the transition between deposition and splash regimes, in order to determine the presence or not of airborne particles. Our results also show the influence of a combination of factors on airborne particles. For this reason, it is interesting to use dimensionless numbers, to describe the
relationship between the inertial, viscosity and surface tension forces, in order to understand physically the emission of airborne particles.

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