The combined influence of a rough surface and thin fluid film upon the splashing threshold and splash dynamics of a droplet impacting onto them
| Autor: | Steven D. Mozes, Randy L. Vander Wal, Gordon M. Berger |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Fluid Flow and Transfer Processes
Splash Materials science business.industry Dynamics (mechanics) Computational Mechanics General Physics and Astronomy engineering.material eye diseases Drop impact Optics Coating Mechanics of Materials Rough surface High-speed photography engineering Surface roughness Composite material business Thin fluid |
| Zdroj: | Experiments in Fluids. 40:23-32 |
| ISSN: | 1432-1114 0723-4864 |
| DOI: | 10.1007/s00348-005-0043-3 |
| Popis: | Surface roughness can have a critical effect upon the splashing threshold and dynamics of a drop impacting on either a dry or rough solid surface or one coated by a thin fluid film. As most coating applications and spray systems quickly evolve to a state where the droplets impinge upon fluid deposited by preceding droplets, the combined contributions of surface roughness and a pre-deposited thin liquid film of comparable thickness upon droplet impingement dynamics are examined. For comparison, we include results for droplets impacting on a smooth, dry surface and a smooth surface wetted by a thin fluid film. The inclusion of surface roughness considerably lowers the splashing threshold and alters the splashing dynamics such that differences in fluid surface tensions between 20.1 and 72.8 dynes/cm or viscosities between 0.4 and 3.3 cP have little effect. |
| Databáze: | OpenAIRE |
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