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The Effect of Surface Roughness on the Contact Line and Splashing Dynamics of Impacting Droplets
Whether a droplet splashes upon impact onto a solid is known to depend not only on the fluid properties and its speed, but also on the substrate characteristics. Past research has shown that splashing is heavily influenced by the substrate roughness. Indeed, in this manuscript, we demonstrate that s...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6803702/ https://www.ncbi.nlm.nih.gov/pubmed/31636321 http://dx.doi.org/10.1038/s41598-019-51490-5 |
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author | Quetzeri-Santiago, Miguel A. Castrejón-Pita, Alfonso A. Castrejón-Pita, J. Rafael |
author_facet | Quetzeri-Santiago, Miguel A. Castrejón-Pita, Alfonso A. Castrejón-Pita, J. Rafael |
author_sort | Quetzeri-Santiago, Miguel A. |
collection | PubMed |
description | Whether a droplet splashes upon impact onto a solid is known to depend not only on the fluid properties and its speed, but also on the substrate characteristics. Past research has shown that splashing is heavily influenced by the substrate roughness. Indeed, in this manuscript, we demonstrate that splashing is ruled by the surface roughness, the splashing ratio, and the dynamic contact angle. Experiments consist of water and ethanol droplets impacting onto solid substrates with varying degrees of roughness. High speed imaging is used to extract the dynamic contact angle as a function of the spreading speed for these impacting droplets. During the spreading phase, the dynamic contact angle achieves an asymptotic maximum value, which depends on the substrate roughness and the liquid properties. We found that this maximum dynamic contact angle, together with the liquid properties, the ratio of the peak to peak roughness and the surface feature mean width, determines the splashing to no-splashing threshold. In addition, these parameters consistently differentiate the splashing behaviour of impacts onto smooth hydrophilic, hydrophobic and superhydrophobic surfaces. |
format | Online Article Text |
id | pubmed-6803702 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-68037022019-10-24 The Effect of Surface Roughness on the Contact Line and Splashing Dynamics of Impacting Droplets Quetzeri-Santiago, Miguel A. Castrejón-Pita, Alfonso A. Castrejón-Pita, J. Rafael Sci Rep Article Whether a droplet splashes upon impact onto a solid is known to depend not only on the fluid properties and its speed, but also on the substrate characteristics. Past research has shown that splashing is heavily influenced by the substrate roughness. Indeed, in this manuscript, we demonstrate that splashing is ruled by the surface roughness, the splashing ratio, and the dynamic contact angle. Experiments consist of water and ethanol droplets impacting onto solid substrates with varying degrees of roughness. High speed imaging is used to extract the dynamic contact angle as a function of the spreading speed for these impacting droplets. During the spreading phase, the dynamic contact angle achieves an asymptotic maximum value, which depends on the substrate roughness and the liquid properties. We found that this maximum dynamic contact angle, together with the liquid properties, the ratio of the peak to peak roughness and the surface feature mean width, determines the splashing to no-splashing threshold. In addition, these parameters consistently differentiate the splashing behaviour of impacts onto smooth hydrophilic, hydrophobic and superhydrophobic surfaces. Nature Publishing Group UK 2019-10-21 /pmc/articles/PMC6803702/ /pubmed/31636321 http://dx.doi.org/10.1038/s41598-019-51490-5 Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Quetzeri-Santiago, Miguel A. Castrejón-Pita, Alfonso A. Castrejón-Pita, J. Rafael The Effect of Surface Roughness on the Contact Line and Splashing Dynamics of Impacting Droplets |
title | The Effect of Surface Roughness on the Contact Line and Splashing Dynamics of Impacting Droplets |
title_full | The Effect of Surface Roughness on the Contact Line and Splashing Dynamics of Impacting Droplets |
title_fullStr | The Effect of Surface Roughness on the Contact Line and Splashing Dynamics of Impacting Droplets |
title_full_unstemmed | The Effect of Surface Roughness on the Contact Line and Splashing Dynamics of Impacting Droplets |
title_short | The Effect of Surface Roughness on the Contact Line and Splashing Dynamics of Impacting Droplets |
title_sort | effect of surface roughness on the contact line and splashing dynamics of impacting droplets |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6803702/ https://www.ncbi.nlm.nih.gov/pubmed/31636321 http://dx.doi.org/10.1038/s41598-019-51490-5 |
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