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Oscillation characteristics of low Weber number impinging micro-droplets

Version 2 2024-06-03, 21:32
Version 1 2019-04-09, 23:35
journal contribution
posted on 2024-06-03, 21:32 authored by Subrat DasSubrat Das, MI Mohammed, Ian GibsonIan Gibson, L Weerasiri, A McDonnell, J Xiang, L Yeo
Oscillation 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

Journal

Theoretical and computational fluid dynamics

Volume

33

Pagination

197-213

Location

Berlin, Germany

ISSN

0935-4964

eISSN

1432-2250

Language

eng

Publication classification

C1 Refereed article in a scholarly journal, C Journal article

Copyright notice

2019, Springer-Verlag GmbH Germany, part of Springer Nature

Issue

2

Publisher

Springer