Superhydrophobic substrates allow the generation of giant quasi-static bubbles
| Autor: | Mariano Rubio-Rubio, J.C. Muñoz-Hervás, Alejandro Sevilla, R. Bolaños-Jiménez, Carlos Martinez-Bazan |
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| Přispěvatelé: | Ministerio de Asuntos Económicos y Transformación Digital (España) |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Bubble 02 engineering and technology Substrate (electronics) 01 natural sciences Instability Bubble dynamics 010305 fluids & plasmas law.invention Physics::Fluid Dynamics Coating law 0103 physical sciences Contact lines Ingeniería Mecánica Mechanical Engineering Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics Capillary length Volume (thermodynamics) Mechanics of Materials Liquid bubble Hydrostatic equilibrium 0210 nano-technology Quasistatic process |
| Zdroj: | e-Archivo. Repositorio Institucional de la Universidad Carlos III de Madrid instname |
| DOI: | 10.1017/jfm.2020.1098 |
| Popis: | We report on experiments of the quasi-static growth and detachment of air bubbles in water from a superhydrophobic substrate, overcoming the maximum size limitation of conventional injectors due to the Rayleigh–Taylor instability. The observations are in good agreement with a hydrostatic model, demonstrating that bubbles grow through a sequence of quasi-equilibrium states. Our experiments corroborate the theoretical prediction of a maximum bubble volume of approximately 6.04pi and a critical base radius of 3.22, both numbers in units of the capillary length (Michael &# Williams, Proc. R. Soc. Lond. A. vol. 351, 1976, pp. 117&;8211#127). This maximum is also reached when bubbles grow in an unbounded, ideally non-wetting surface, establishing the ultimate size limit of quasi-static bubble formation. This work has been supported by the Spanish MINECO under Projects DPI2017-88201-C3-2-R and DPI2017-88201-C3-3-R, partly financed through European funds, and by Universidad de Jaén Project Ref. 1263528 funded by Programa Operativo FEDER Andalucía 2014–2020. Support from the Red Nacional para el Desarrollo de la Microfluídica, RED2018 102829 T, is also acknowledged. |
| Databáze: | OpenAIRE |
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