Role and significance of wetting pressures during droplet impact on structured superhydrophobic surfaces
| العنوان: | Role and significance of wetting pressures during droplet impact on structured superhydrophobic surfaces |
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| المؤلفون: | Purbarun Dhar, Sarit K. Das, Karthik Murugadoss |
| المصدر: | The European Physical Journal E. 40 |
| بيانات النشر: | Springer Science and Business Media LLC, 2017. |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | Materials science, Internal flow, Flow (psychology), Biophysics, Time evolution, Internal pressure, Nanotechnology, 02 engineering and technology, Surfaces and Interfaces, General Chemistry, Mechanics, Surface finish, 021001 nanoscience & nanotechnology, 01 natural sciences, 010305 fluids & plasmas, 0103 physical sciences, General Materials Science, Fluidics, Dewetting, Wetting, 0210 nano-technology, Biotechnology |
| الوصف: | The impact dynamics and spreading behavior of droplets impinging on structured superhydrophobic surfaces are dependent on both the droplet initial conditions and the surface texture. The equivalence of wetting and dewetting pressures is classically known to be a critical factor in determining the state of a droplet during the contact and spreading phases. The present study extensively examines the underlying physics behind this pressure balance during the impact process and its direct role in determining the wetting process. Extensive three-dimensional simulations employing droplet impact on a structured superhydrophobic surface has been performed to reveal the intricacies of the interactivities of the fluid with the microstructure. Insight onto the acute role of wetting pressures and the implications of the same on determining the wetting dynamics, with internal fluidics of the droplet during the impact process, has been discussed. The phenomenon of state transition from the Cassie-Baxter to the Wenzel up on impact is also investigated and the intricate flow mechanics at play within the posts has been presented. Knowledge of pressure distribution and internal flow structures within the droplet during its interaction with the surface at different instances of time reveals the root mechanism behind the impalement of the droplet to a fully wetting state. Analysis of the internal pressure and flow distribution also presents necessary justification for the existence of a partially impaled state. The time evolution of spread for different scenarios is in agreement with experimental results and the article provides insight onto the role of wetting pressure in determining fluidic interactions on such surfaces. |
| تدمد: | 1292-895X 1292-8941 |
| DOI: | 10.1140/epje/i2017-11491-x |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::280ec1a5323305fa5eb1e8cf6cba8976 https://doi.org/10.1140/epje/i2017-11491-x |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi.dedup.....280ec1a5323305fa5eb1e8cf6cba8976 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 1292895X 12928941 |
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| DOI: | 10.1140/epje/i2017-11491-x |