Droplet impacting dynamics on wettable, rough and slippery oil-infuse surfaces
| Autor: | Tao Wang, Yuyan Jiang, Lei Zhang, Seolha Kim |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Triple line
0209 industrial biotechnology Materials science Mechanical Engineering Dynamics (mechanics) 02 engineering and technology Mechanics Surface finish Edge (geometry) Instability eye diseases 020303 mechanical engineering & transports 020901 industrial engineering & automation 0203 mechanical engineering Mechanics of Materials Wetting Impact dynamics |
| Zdroj: | Journal of Mechanical Science and Technology. 34:219-228 |
| ISSN: | 1976-3824 1738-494X |
| Popis: | In this study, we investigated droplet impact dynamics offalling water drops (D0 ~ 2.3 mm ) on slippery oil-infused surfaces and compared them to other features of the surfaces, to elucidate the wettability- and roughness-controlled characteristics. We prepared transparent substrates with the designed characteristics, so it would be feasible to visualize the droplet impact dynamics in detail. A wide range of impact kinetics (We ~ 800 (=ρD0Vi2/σw)) was covered, which gave rise to several types of droplet-impact: gentle spreading, wavy (undulated fingers of spreading edges), droplet break-up, and splashing with small secondary droplets. The basic parameters of the droplet-solid interactions were measured, and events were mapped with respect to the sample surface and impact kinetic conditions. We found that, generally, surface wettability has a major influence on the triple line shape and instability during the impact and retraction process, and thus determines events in of the framework of the dynamic wetting-failure model. Furthermore, while rough conditions promote instability of the impacted droplet, slippery lubricant-infused features tend to dampen perturbations of the spreading/retracting edge. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink