Bouncing-to-wetting transition of water droplets impacting soft solids

Soft surfaces impacted by liquid droplets trap more air underneath than their rigid counterparts. The extended lifetime of the air film not only facilitates bouncing behaviours of the impacting droplets but also increases the possibility of interactions between the air film itself and the air cavity...

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Main Authors: Mitra, Surjyasish, Vo, Quoc, Tran, Tuan
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/159657
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1596572022-06-29T06:04:33Z Bouncing-to-wetting transition of water droplets impacting soft solids Mitra, Surjyasish Vo, Quoc Tran, Tuan School of Physical and Mathematical Sciences School of Mechanical and Aerospace Engineering Science::Physics Rupturing Dynamics Collapsing Dynamics Soft surfaces impacted by liquid droplets trap more air underneath than their rigid counterparts. The extended lifetime of the air film not only facilitates bouncing behaviours of the impacting droplets but also increases the possibility of interactions between the air film itself and the air cavity formed inside the droplets by capillary waves. Such interactions may cause rupture of the trapped air film by a so-called dimple inversion phenomenon and suppress bouncing. In this work, we systematically investigate the relationship between air cavity collapse and air film rupture for water droplets impacting soft, hydrophobic surfaces. By constructing a bouncing-to-wetting phase diagram based on the rupturing dynamics of the trapped air film, we observe that the regime in which air film rupture is induced by dimple inversion consistently separates the bouncing regime and the one in which wetting is caused by random rupture. We also found that air film rupture by dimple inversion in-turn affects both the collapsing dynamics of the air cavity and the resulting high-speed jet. We then provide a detailed characterisation of the collapsing dynamics of the air cavity and subsequent jetting. Agency for Science, Technology and Research (A*STAR) Nanyang Technological University This study is supported by the Nanyang Technological University (NTU) and A*STAR (SERC Grant No. 1523700102). S.M. is supported by NTU Research Scholarship. 2022-06-29T06:04:33Z 2022-06-29T06:04:33Z 2021 Journal Article Mitra, S., Vo, Q. & Tran, T. (2021). Bouncing-to-wetting transition of water droplets impacting soft solids. Soft Matter, 17(24), 5969-5977. https://dx.doi.org/10.1039/d1sm00339a 1744-683X https://hdl.handle.net/10356/159657 10.1039/d1sm00339a 34047748 2-s2.0-85108692383 24 17 5969 5977 en SERC 1523700102 Soft Matter © 2021 The Royal Society of Chemistry. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Physics
Rupturing Dynamics
Collapsing Dynamics
spellingShingle Science::Physics
Rupturing Dynamics
Collapsing Dynamics
Mitra, Surjyasish
Vo, Quoc
Tran, Tuan
Bouncing-to-wetting transition of water droplets impacting soft solids
description Soft surfaces impacted by liquid droplets trap more air underneath than their rigid counterparts. The extended lifetime of the air film not only facilitates bouncing behaviours of the impacting droplets but also increases the possibility of interactions between the air film itself and the air cavity formed inside the droplets by capillary waves. Such interactions may cause rupture of the trapped air film by a so-called dimple inversion phenomenon and suppress bouncing. In this work, we systematically investigate the relationship between air cavity collapse and air film rupture for water droplets impacting soft, hydrophobic surfaces. By constructing a bouncing-to-wetting phase diagram based on the rupturing dynamics of the trapped air film, we observe that the regime in which air film rupture is induced by dimple inversion consistently separates the bouncing regime and the one in which wetting is caused by random rupture. We also found that air film rupture by dimple inversion in-turn affects both the collapsing dynamics of the air cavity and the resulting high-speed jet. We then provide a detailed characterisation of the collapsing dynamics of the air cavity and subsequent jetting.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Mitra, Surjyasish
Vo, Quoc
Tran, Tuan
format Article
author Mitra, Surjyasish
Vo, Quoc
Tran, Tuan
author_sort Mitra, Surjyasish
title Bouncing-to-wetting transition of water droplets impacting soft solids
title_short Bouncing-to-wetting transition of water droplets impacting soft solids
title_full Bouncing-to-wetting transition of water droplets impacting soft solids
title_fullStr Bouncing-to-wetting transition of water droplets impacting soft solids
title_full_unstemmed Bouncing-to-wetting transition of water droplets impacting soft solids
title_sort bouncing-to-wetting transition of water droplets impacting soft solids
publishDate 2022
url https://hdl.handle.net/10356/159657
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