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Oscillation characteristics of low Weber number impinging micro-droplets
journal contribution
posted on 2020-07-10, 10:17 authored by Subrat Das, Mazher MohammedMazher Mohammed, Ian Gibson, Lanka Weerasiri, Amarin McDonnell, Junting Xiang, Leslie YeoOscillation characteristics of micro-droplets, when in partial contact with a dry and homogeneous substrate, are investigated using a volume of fluid (VOF) numerical method. Water is used as a fluid in both numerical and experimental studies. The velocity vectors are plotted along the phase boundary line, i.e. along the droplet interface, to show how the contact angle impacts the droplet shape during the entire oscillation process. It has been predicted that when the surface/liquid combination is of larger contact angle, the water droplet tends to spread partially as the contact velocity dynamics dominate over inertia, thereby restricting the change in shape, i.e. resulting in lesser mode of oscillations. However, all droplets that are considered here show a damped harmonic motion with the amplitude gradually decreasing to zero. Particularly, at a lower Weber number impact, it is predicted that both the height and spreading dynamics exhibit a unique decaying function for each droplet size considered.
History
School
- Design
Published in
Theoretical and Computational Fluid DynamicsVolume
33Issue
2Pages
197 - 213Publisher
Springer Science and Business Media LLCVersion
- VoR (Version of Record)
Rights holder
© Springer-Verlag GmbH Germany, part of Springer NatureAcceptance date
2019-02-14Publication date
2019-03-04Copyright date
2019ISSN
0935-4964eISSN
1432-2250Publisher version
Language
- en