Droplet collision and jet evolution hydrodynamics in wetting modulated valley configurations
Droplet impact hydrodynamics on “V”-shaped valleys or grooves of variant wettability and geometric dimensions have been studied experimentally and probed theoretically. The groove geometry makes the hydrodynamics three-dimensional, as in addition to the droplet dynamics in the lateral direction, liq...
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craippubl:10.1063/5.0048185 2024-09-15T18:24:58+00:00 Droplet collision and jet evolution hydrodynamics in wetting modulated valley configurations Agrawal, Shubham Khurana, Gargi Dhar, Purbarun Indian Institute of Technology Kharagpur Science and Engineering Research Board 2021 http://dx.doi.org/10.1063/5.0048185 https://pubs.aip.org/aip/pof/article-pdf/doi/10.1063/5.0048185/13618397/042008_1_online.pdf en eng AIP Publishing Physics of Fluids volume 33, issue 4 ISSN 1070-6631 1089-7666 journal-article 2021 craippubl https://doi.org/10.1063/5.0048185 2024-08-08T04:04:35Z Droplet impact hydrodynamics on “V”-shaped valleys or grooves of variant wettability and geometric dimensions have been studied experimentally and probed theoretically. The groove geometry makes the hydrodynamics three-dimensional, as in addition to the droplet dynamics in the lateral direction, liquid jets are generated from the post-impact droplet along the axial direction of the groove. The effect of the impact Weber number (We) on the jet velocity, the non-dimensional spreading width (γ), and north-pole height (h*) has been studied. It has been observed that the inertial forces dominate over the surface forces for higher impact We and hence, the effect of wettability is not important. However, the wettability of the substrate has a significant role in lower impact We as recoiling of the droplet is observed for the impact on the superhydrophobic substrate in this case. It has been observed that the spreading width of the post-impact droplet decreases with the increase in groove steepness. The jetting hydrodynamics has been probed and instantaneously after the impact, the generated jets travel at high velocity, but quickly reduce to a steady value. Jet velocity is observed to increase with an increase in the hydrophobicity of the substrate as well as the impact We. A semi-analytical formalism has been proposed to predict the jet velocity evolution in terms of governing Weber (We) and capillary (Ca) numbers. The predictions from the proposed model are in good agreement with the experimental results. Article in Journal/Newspaper North Pole AIP Publishing Physics of Fluids 33 4 |
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AIP Publishing |
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English |
description |
Droplet impact hydrodynamics on “V”-shaped valleys or grooves of variant wettability and geometric dimensions have been studied experimentally and probed theoretically. The groove geometry makes the hydrodynamics three-dimensional, as in addition to the droplet dynamics in the lateral direction, liquid jets are generated from the post-impact droplet along the axial direction of the groove. The effect of the impact Weber number (We) on the jet velocity, the non-dimensional spreading width (γ), and north-pole height (h*) has been studied. It has been observed that the inertial forces dominate over the surface forces for higher impact We and hence, the effect of wettability is not important. However, the wettability of the substrate has a significant role in lower impact We as recoiling of the droplet is observed for the impact on the superhydrophobic substrate in this case. It has been observed that the spreading width of the post-impact droplet decreases with the increase in groove steepness. The jetting hydrodynamics has been probed and instantaneously after the impact, the generated jets travel at high velocity, but quickly reduce to a steady value. Jet velocity is observed to increase with an increase in the hydrophobicity of the substrate as well as the impact We. A semi-analytical formalism has been proposed to predict the jet velocity evolution in terms of governing Weber (We) and capillary (Ca) numbers. The predictions from the proposed model are in good agreement with the experimental results. |
author2 |
Indian Institute of Technology Kharagpur Science and Engineering Research Board |
format |
Article in Journal/Newspaper |
author |
Agrawal, Shubham Khurana, Gargi Dhar, Purbarun |
spellingShingle |
Agrawal, Shubham Khurana, Gargi Dhar, Purbarun Droplet collision and jet evolution hydrodynamics in wetting modulated valley configurations |
author_facet |
Agrawal, Shubham Khurana, Gargi Dhar, Purbarun |
author_sort |
Agrawal, Shubham |
title |
Droplet collision and jet evolution hydrodynamics in wetting modulated valley configurations |
title_short |
Droplet collision and jet evolution hydrodynamics in wetting modulated valley configurations |
title_full |
Droplet collision and jet evolution hydrodynamics in wetting modulated valley configurations |
title_fullStr |
Droplet collision and jet evolution hydrodynamics in wetting modulated valley configurations |
title_full_unstemmed |
Droplet collision and jet evolution hydrodynamics in wetting modulated valley configurations |
title_sort |
droplet collision and jet evolution hydrodynamics in wetting modulated valley configurations |
publisher |
AIP Publishing |
publishDate |
2021 |
url |
http://dx.doi.org/10.1063/5.0048185 https://pubs.aip.org/aip/pof/article-pdf/doi/10.1063/5.0048185/13618397/042008_1_online.pdf |
genre |
North Pole |
genre_facet |
North Pole |
op_source |
Physics of Fluids volume 33, issue 4 ISSN 1070-6631 1089-7666 |
op_doi |
https://doi.org/10.1063/5.0048185 |
container_title |
Physics of Fluids |
container_volume |
33 |
container_issue |
4 |
_version_ |
1810465358377648128 |