TY - JOUR

T1 - Bubble dynamics in thin liquid films and breakup at drop impact

AU - Gatapova, Elizaveta Ya

AU - Gatapova, Kyunney B.

N1 - Funding Information: The high-speed visualization, data processing, and analysis were financially supported by the Russian Science Foundation (project no. 16-19-10675). The calibration by IR measurements was carried out under state contract with IT SB RAS (AAAA-A17-117022850022-0). Publisher Copyright: © The Royal Society of Chemistry. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/12/14

Y1 - 2020/12/14

N2 - 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. This journal is

AB - 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. This journal is

KW - HEAT-TRANSFER

KW - REGIMES

KW - FLOW

KW - ATOMIZATION

KW - SURFACE

KW - GROWTH

KW - PHASE

KW - TIMES

UR - http://www.scopus.com/inward/record.url?scp=85097572038&partnerID=8YFLogxK

U2 - 10.1039/d0sm01882a

DO - 10.1039/d0sm01882a

M3 - Article

C2 - 33215625

AN - SCOPUS:85097572038

VL - 16

SP - 10397

EP - 10404

JO - Soft Matter

JF - Soft Matter

SN - 1744-683X

IS - 46

ER -