Topical Problems of Fluid Mechanics


Institute of Thermomechanics AS CR, v.v.i.	CTU in Prague Faculty of Mech. Engineering Dept. Tech. Mathematics	MIO Université du Sud Toulon Var - AMU - CNRS - IRD	Czech Pilot centre ERCOFTAC

Oscillations and Short Waves on a Free Falling Drop Surface (Experiment and Theory)
Y. D. Chashechkin
Abstract:
Synchronous macrophotography and high-speed video filming data were used to investigate pinch-off, oscillations and short capillary surface waves of a free falling droplet. Planning of the experiment was carried out taking into account a free surface energy resulted from anisotropy of atomic-molecular interactions in a thin subsurface layer with a thickness of the order of the molecular cluster size (10⁻⁶ cm). During a drop pinch-off, fast process of the free surface energy release leads to formation of large-amplitude oscillations and short capillary waves. Theoretical model of droplet oscillations based on the Euler equations was developed.
Keywords:
droplet shape, oscillation, capillary wave, experiment, ideal liquids

Fulltext: PDF DOI: https://doi.org/10.14311/TPFM.2019.007

In Proceedings Topical Problems of Fluid Mechanics 2019, Prague, 2019 Edited by David Šimurda and Tomáš Bodnár, pp. 45-52 ISBN 978-80-87012-69-7 (Print) ISSN 2336-5781 (Print)