Droplets splashing upon films of the same fluid of various depths
| Autor: | Steven D. Mozes, Randy L. Vander Wal, Gordon M. Berger |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Fluid Flow and Transfer Processes
Splash Range (particle radiation) Materials science business.industry Computational Mechanics General Physics and Astronomy Layer thickness Matrix (geology) Surface tension Viscosity Optics Mechanics of Materials High-speed photography Composite material business Thin fluid |
| Zdroj: | Experiments in Fluids. 40:33-52 |
| ISSN: | 1432-1114 0723-4864 |
| DOI: | 10.1007/s00348-005-0044-2 |
| Popis: | We explore the effects of fluid films of variable depths on droplets impacting into them. Corresponding to a range of fluid “film” depths, a non-dimensional parameter—H*, defined as the ratio of the film thickness to the droplet diameter—is varied in the range 0.1≤H*≤10. In general, the effect of the fluid film imposes a dramatic difference on the dynamics of the droplet–surface interaction when compared to a similar impact on a dry surface. This is illustrated by the size distribution and number of the splash products. While thin fluid films (H*≈0.1) promote splashing, thicker films (1≤H*≤10) act to inhibit it. The relative roles of surface tension and viscosity are investigated by comparison of a matrix of fluids with low and high values of these properties. Impingement conditions, as characterized by Reynolds and Weber numbers, are varied by velocity over a range from 1.34 to 4.22 m/s, maintaining a constant droplet diameter of 2.0 mm. The dependence of splashing dynamics, characterized by splash product size and number, on the fluid surface tension and viscosity and film thickness are discussed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink