Bubble dynamics in thin liquid films and breakup at drop impact

Soft Matter
Elizaveta Ya Gatapova, Kyunney B Gatapova

Abstract

A liquid drop impacting on a smooth surface heated above the boiling point and below the Leidenfrost temperature spreads over the surface forming a thin liquid film. We observed bubble nuclei originating at the first contact of a liquid with a heated sapphire surface, and the formation of a thin liquid film with one layer of microbubbles. In the present paper, we describe in detail the bubble dynamics for the substrate temperature ranging from 130 to 170 °C. The thickness of the liquid film is estimated to vary within the range from 40 to 80 μm at We = 76 and an advancing contact angle of 76°. We have detected how bubbles break the film, which is followed by dry patch propagation and sessile droplet formation, and elucidated the mechanism of spontaneous liquid film breakup. The bubble coalescence and waves induced by the rollback flow from the lamella periphery or by reversible bubble bursting are the reason for irreversible hole formation.

References

Feb 27, 2016·Physical Review Letters·Minori ShirotaDetlef Lohse
Sep 25, 2017·Soft Matter·Michiel A J van LimbeekDetlef Lohse
Oct 19, 2017·Optics Express·Joyce IbrahimYves Jourlin
Dec 9, 2017·Physical Review Letters·Er Qiang LiSigurdur T Thoroddsen
Apr 6, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Min PackYing Sun
Apr 7, 2018·Nano Letters·Qingyang Wang, Renkun Chen
May 10, 2019·Soft Matter·Xingjian YuXiaobing Luo
Aug 8, 2020·Soft Matter·Sang-Hyeon LeeJung Ho Je

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