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Resistant energy analysis of self-pulling process during dropwise condensation on superhydrophobic surfaces
Recently the development of superhydrophobic surfaces with one-tier or hierarchical textures has drawn increasing attention because enhanced condensation heat transfer has been observed on such biomimetic surfaces in well-tailored supersaturation or subcooling conditions. However, the physical mecha...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
RSC
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9473257/ https://www.ncbi.nlm.nih.gov/pubmed/36133189 http://dx.doi.org/10.1039/c8na00237a |
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author | Vandadi, Aref Zhao, Lei Cheng, Jiangtao |
author_facet | Vandadi, Aref Zhao, Lei Cheng, Jiangtao |
author_sort | Vandadi, Aref |
collection | PubMed |
description | Recently the development of superhydrophobic surfaces with one-tier or hierarchical textures has drawn increasing attention because enhanced condensation heat transfer has been observed on such biomimetic surfaces in well-tailored supersaturation or subcooling conditions. However, the physical mechanisms underlying condensation enhancement are still less understood. Here we report an energy-based analysis on the formation and growth of condensate droplets on two-tier superhydrophobic surfaces, which are fabricated by decorating carbon nanotubes (CNTs) onto microscale fluorinated pillars. Thus-formed hierarchical surfaces with two tier micro/nanoscale roughness are proved to be superior to smooth surfaces in the spatial control of condensate droplets. In particular, we focus on the self-pulling process of condensates in the partially wetting morphology (PW) from surface cavities due to intrinsic Laplace pressure gradient. In this analysis, the self-pulling process of condensate tails is resisted by adhesion energy, viscous dissipation, contact line dissipation and line tension in a combined manner. This process can be facilitated by adjusting the configuration and length scale of the first-tier texture. The optimum design can not only lower the total resistant energy but also favor the out-of-plane motion of condensate droplets anchored in the first-tier cavity. It is also shown that engineered surface with hierarchical roughness is beneficial to remarkably mitigating contact line dissipation from the perspective of molecular kinetic theory (MKT). Our study suggests that scaling down surface roughness to submicron scale can facilitate the self-propelled removal of condensate droplets. |
format | Online Article Text |
id | pubmed-9473257 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | RSC |
record_format | MEDLINE/PubMed |
spelling | pubmed-94732572022-09-20 Resistant energy analysis of self-pulling process during dropwise condensation on superhydrophobic surfaces Vandadi, Aref Zhao, Lei Cheng, Jiangtao Nanoscale Adv Chemistry Recently the development of superhydrophobic surfaces with one-tier or hierarchical textures has drawn increasing attention because enhanced condensation heat transfer has been observed on such biomimetic surfaces in well-tailored supersaturation or subcooling conditions. However, the physical mechanisms underlying condensation enhancement are still less understood. Here we report an energy-based analysis on the formation and growth of condensate droplets on two-tier superhydrophobic surfaces, which are fabricated by decorating carbon nanotubes (CNTs) onto microscale fluorinated pillars. Thus-formed hierarchical surfaces with two tier micro/nanoscale roughness are proved to be superior to smooth surfaces in the spatial control of condensate droplets. In particular, we focus on the self-pulling process of condensates in the partially wetting morphology (PW) from surface cavities due to intrinsic Laplace pressure gradient. In this analysis, the self-pulling process of condensate tails is resisted by adhesion energy, viscous dissipation, contact line dissipation and line tension in a combined manner. This process can be facilitated by adjusting the configuration and length scale of the first-tier texture. The optimum design can not only lower the total resistant energy but also favor the out-of-plane motion of condensate droplets anchored in the first-tier cavity. It is also shown that engineered surface with hierarchical roughness is beneficial to remarkably mitigating contact line dissipation from the perspective of molecular kinetic theory (MKT). Our study suggests that scaling down surface roughness to submicron scale can facilitate the self-propelled removal of condensate droplets. RSC 2018-12-20 /pmc/articles/PMC9473257/ /pubmed/36133189 http://dx.doi.org/10.1039/c8na00237a Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/ |
spellingShingle | Chemistry Vandadi, Aref Zhao, Lei Cheng, Jiangtao Resistant energy analysis of self-pulling process during dropwise condensation on superhydrophobic surfaces |
title | Resistant energy analysis of self-pulling process during dropwise condensation on superhydrophobic surfaces |
title_full | Resistant energy analysis of self-pulling process during dropwise condensation on superhydrophobic surfaces |
title_fullStr | Resistant energy analysis of self-pulling process during dropwise condensation on superhydrophobic surfaces |
title_full_unstemmed | Resistant energy analysis of self-pulling process during dropwise condensation on superhydrophobic surfaces |
title_short | Resistant energy analysis of self-pulling process during dropwise condensation on superhydrophobic surfaces |
title_sort | resistant energy analysis of self-pulling process during dropwise condensation on superhydrophobic surfaces |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9473257/ https://www.ncbi.nlm.nih.gov/pubmed/36133189 http://dx.doi.org/10.1039/c8na00237a |
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