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Erschienen in:
01.01.2018 | Research Article
Immiscible impact dynamics of droplets onto millimetric films
Erschienen in: Experiments in Fluids | Ausgabe 1/2018
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Abstract
The impact of liquid droplets onto a film of an immiscible liquid is studied experimentally across a broad range of parameters [\(Re = O(10^{1}-10^{3})\), \(We = O(10^{2}-10^{3})\)] with the aid of high-speed photography and image analysis. Above a critical impact parameter, \(Re^{1/2}We^{1/4} \approx 100\), the droplet fragments into multiple satellite droplets, which typically occurs as the result of a fingering instability. Statistical analysis indicates that the satellite droplets are approximately log-normally distributed, in agreement with some previous studies and the theoretical predictions of Wu (Prob Eng Mech 18:241–249, 2003). However, in contrast to a recent study by Lhuissier et al. (Phys Rev Lett 110:264503, 2013), we find that it is the modal satellite diameter, not the mean diameter, that scales inversely with the impact speed (or Weber number) and that the dependence is \(d_\mathrm{{mod}} \sim We^{-1/4}\).