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The phenomena of millimeter sized water droplets impinging on a thin stationary water film at multiple incidence angles are experimentally investigated in this work. The effects of water droplet impacting Weber number, incidence angle, and dimensionless water film thickness on crown characteristic parameters and splash threshold are comprehensively analyzed. The experimental results show that as the tangential impacting Weber number is constant, the height of the liquid crown increases with the increase of the incidence angle, but the evolution law of the liquid crown radius is independent. As the normal impacting Weber number is constant, the height and radius of the liquid crown increase with the decrease of the incidence angle. As the dimensionless water film thickness increases, the radius of the liquid crown top decreases, while the radius of the liquid crown bottom increases. The height of the liquid crown first increases and then decreases with the increasing dimensionless film thickness. The prediction models are summarized to describe the experimental results of the maximum liquid crown height and the evolution of the liquid crown radius over time when the dimensionless water film thickness is 0.1. The splash threshold models for the dimensionless water film thickness of 0.1 and 0.2 are also summarized, respectively.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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