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Study of airborne particles generated by the impact of droplets

Charles MOTZKUS, doctorate thesis of the Science faculty (faculté des sciences) of Créteil of Paris XII – Val de Marne University; Fields: : universe and environment sciences (sciences de l’univers et de l’environnement) - Aerosols physics; 280p, defended on the 14th December 2007 in Créteil.

Document type > *Mémoire/HDR/Thesis

Keywords > aerosol physics, aerosol, droplets, impact, liquid film, particles, resuspension, splash

Research Unit > IRSN/DSU/SERAC/LPMA

Authors > MOTZKUS Charles

Publication Date > 14/12/2007

Summary

A liquid droplet impinging onto surfaces occurs in many industrial and natural processes. The study of this phenomenon is fundamental in order to determine the potential sources of contamination in the case of scenarios of liquid falls such as dripping. There are very few data in the literature in the case of the impact of millimeter-size droplets. The purpose of our work is to study experimentally the particle emission during the impact of droplets onto a liquid film. Experiments were conducted to study the influence of the velocity and the diameter of the 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. The microdroplets produced, with diameters less than fifty micrometers, are characterised in terms of total mass and size distribution. Our results also show the influence of a combination of several factors on the production of 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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