| CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES |
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Numerical simulation of two droplets impacting upon a dynamic liquid film |
| Quan-Yuan Zeng(曾全元)1,2, Xiao-Hua Zhang(张小华)1,2,†, and Dao-Bin Ji(纪道斌)3 |
1 Three Gorges Mathematical Research Center, China Three Gorges University, Yichang 443002, China;
2 College of Science, China Three Gorges University, Yichang 443002, China;
3 Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, China |
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Abstract The impact of droplets on the liquid film is widely involved in industrial and agricultural fields. In recent years, plenty of works are limited to dry walls or stationary liquid films, and the research of multi-droplet impact dynamic films is not sufficient. Based on this, this paper employs a coupled level set and volume of fluid (CLSVOF) method to numerically simulate two-droplet impingement on a dynamic liquid film. In our work, the dynamic film thickness, horizontal central distance between the droplets, droplets' initial impact speed, and simultaneously the flow velocity of the moving film are analyzed. The evolution phenomenon and mechanism caused by the collision are analyzed in detail. We find that within a certain period of time, the droplet spacing does not affect the peripheral crown height; when the droplet spacing decreases or the initial impact velocity increases, the height of the peripheral crown increases at the beginning, and then, because the crown splashed under Rayleigh-Plateau instability, this results in the reduction of the crown height. At the same time, it is found that when the initial impact velocity increases, the angle between the upstream peripheral jet and the dynamic film becomes larger. The more obvious the horizontal movement characteristics, the more restrained the crown height; the spread length increases with the increase of the dynamic film speed, droplet spacing and the initial impact velocity. When the liquid film is thicker, more fluid enters the crown, due to the crown being unstable, the surface tension is not enough to overcome the weight of the rim at the end of the crown, resulting in droplets falling off.
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Received: 02 June 2021
Revised: 23 July 2021
Accepted manuscript online: 01 September 2021
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PACS:
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68.03.Cd
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(Surface tension and related phenomena)
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68.15.+e
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(Liquid thin films)
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68.35.Md
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(Surface thermodynamics, surface energies)
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68.05.Cf
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(Liquid-liquid interface structure: measurements and simulations)
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| Fund: Project supported by the Engineering Research Center of Eco-environment in the Three Gorges Reservoir Region (Grant No. KF2019-10). |
Corresponding Authors:
Xiao-Hua Zhang
E-mail: zhangxiaohua07@163.com
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Cite this article:
Quan-Yuan Zeng(曾全元), Xiao-Hua Zhang(张小华), and Dao-Bin Ji(纪道斌) Numerical simulation of two droplets impacting upon a dynamic liquid film 2022 Chin. Phys. B 31 046801
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