Polytechnic University of Valencia Congress, ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems

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Generalized analysis of the deposition/splashing limit for one- and two-component droplet impacts upon thin films
Ronan Bernard, Patrick Foltyn, Anne Geppert, Grazia Lamanna, Bernhard Weigand

Last modified: 18-07-2017

Abstract


Single drop impacts on thin liquid layers are of particular interest because of the ejection of secondary droplets, theso-called splashing. Only a few studies handle the deposition/splashing limit for two-component interaction, where the liquid properties of the impacting drop and wall film differ significantly.This study aims at identifying a unified approach for one- and two-component interactions to determine the deposi- tion/splashing limit. Therefore, a large database of both interactions is considered, which includes data from litera- ture for one-component interactions plus the following binary combinations: hyspin-hexadecane, diesel-hexadecane and diesel-motor oil. Furthermore, a systematic study of two-component interactions with several silicon oils and hexadecane is performed. To map the outcomes, the Ohnesorge number Oh and the Reynolds number Re calcu- lated with arithmetically averaged fluid properties between droplet and wall film fluid are chosen. The dimensions- less film thickness δ is added to form a 3D plot, where one- and two-component experiments are combined.Existing correlations from the literature are revised regarding both interactions and their consistency is checked. The investigated range of high viscosity fluids allow us to propose an improvement of the correlation for high Oh. Our results show that the arithmetically averaged fluid properties lead to a good repartition of both one- and two- components interactions toward the deposition/splashing limit. They also corroborate the previous findings that an increase of δ inhibits splashing but its influence is decreasing with increasing Oh.

DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4810

 


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