Droplet impact on wetted structured surfaces

doi:10.1007/s10483-022-2820-5

Applied Mathematics and Mechanics (English Edition) ›› 2022, Vol. 43 ›› Issue (3): 437-446.doi: https://doi.org/10.1007/s10483-022-2820-5

Droplet impact on wetted structured surfaces

M. MOHASAN¹, A. B. AQEEL^1,2, Huiling DUAN^1,3, Pengyu LYU¹, Yantao YANG¹

1. Department of Mechanics and Engineering Science, State Key Laboratory for Turbulence and Complex Systems (SKLTCS), Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), College of Engineering, Peking University, Beijing 100871, China;
2. Department of Mechatronics Engineering, National University of Sciences and Technology, Islamabad 44000, Pakistan;
3. Center for Applied Physics and Technology (CAPT), HEDPS and IFSA Collaborative Innovation Center of MoE, Peking University, Beijing 100871, China

收稿日期:2021-08-08 修回日期:2021-12-13 发布日期:2022-02-22
通讯作者: Yantao YANG, E-mail: yantao.yang@pku.edu.cn
基金资助:
the National Natural Science Foundation of China (Nos. 11988102, 91848201, 11872004, and 11802004)

Droplet impact on wetted structured surfaces

M. MOHASAN¹, A. B. AQEEL^1,2, Huiling DUAN^1,3, Pengyu LYU¹, Yantao YANG¹

1. Department of Mechanics and Engineering Science, State Key Laboratory for Turbulence and Complex Systems (SKLTCS), Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), College of Engineering, Peking University, Beijing 100871, China;
2. Department of Mechatronics Engineering, National University of Sciences and Technology, Islamabad 44000, Pakistan;
3. Center for Applied Physics and Technology (CAPT), HEDPS and IFSA Collaborative Innovation Center of MoE, Peking University, Beijing 100871, China

Received:2021-08-08 Revised:2021-12-13 Published:2022-02-22
Contact: Yantao YANG, E-mail: yantao.yang@pku.edu.cn
Supported by:
the National Natural Science Foundation of China (Nos. 11988102, 91848201, 11872004, and 11802004)

摘要/Abstract

摘要： In this study, we numerically investigate the droplet impact onto a thin liquid film deposited on a structured surface with square pillars and cavities. The time evolution of crown geometry is strongly affected by the surface structure. When the thickness of the liquid film is larger than the structure height, the expanding speed of the crown base radius is independent of the structure width. However, if the liquid film thickness is equal to the structure height, the crown base expands slower as the structure width increases. Surface structures have strong effects on the crown height and radius, and can prevent ejected filament from breaking into satellite droplets for certain cases. For the liquid film with the thickness equal to the pillar height, both the crown height and the radius exhibit non-monotonic behaviors as the pillar width increases. There exists one pillar width which produces the smallest crown height and the largest crown radius.

关键词: droplet impact, structured surface, liquid film, crown formation

Abstract: In this study, we numerically investigate the droplet impact onto a thin liquid film deposited on a structured surface with square pillars and cavities. The time evolution of crown geometry is strongly affected by the surface structure. When the thickness of the liquid film is larger than the structure height, the expanding speed of the crown base radius is independent of the structure width. However, if the liquid film thickness is equal to the structure height, the crown base expands slower as the structure width increases. Surface structures have strong effects on the crown height and radius, and can prevent ejected filament from breaking into satellite droplets for certain cases. For the liquid film with the thickness equal to the pillar height, both the crown height and the radius exhibit non-monotonic behaviors as the pillar width increases. There exists one pillar width which produces the smallest crown height and the largest crown radius.

Key words: droplet impact, structured surface, liquid film, crown formation

中图分类号:

76D45

M. MOHASAN, A. B. AQEEL, Huiling DUAN, Pengyu LYU, Yantao YANG. Droplet impact on wetted structured surfaces[J]. Applied Mathematics and Mechanics (English Edition), 2022, 43(3): 437-446.

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Droplet impact on wetted structured surfaces

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