中文版 | English
Title

Numerical investigation of air cushioning in the impact of micro-droplet under electrostatic fields

Author
Corresponding AuthorGuan, Yin; Huang, YongAn
Publication Years
2023
DOI
Source Title
ISSN
1070-6631
EISSN
1089-7666
Volume35Issue:1
Abstract
Air cushioning widely occurs when a droplet impacts onto a solid or fluid surface at low velocity, which is mediated by the lubrication pressure of a thin air layer. Such air cushioning phenomena for micro-sized droplets bear important implications for precision coating and inkjet printing. In this study, we investigate numerically the air cushioning in the micro-sized droplets of various sizes impacting on a solid surface based on the volume of fluid method as implemented in the OpenFOAM framework. We find that the critical impact speed for bouncing on the air cushion increases as the droplet radius decreases, while the Weber number remains in a narrow range from 1 to 4. The scaling law of the critical impact speed for bouncing is derived by balancing the lubrication pressure of the air cushion with the capillary pressure and droplet inertia. The impact mode transforms from bouncing to wetting with an electric field. A group of phase diagrams of the electric Bond number vs the Weber number is presented for various droplet sizes. The diagrams are consistent with the scaling law of the critical electric field for the wetting-without-bubble mode. The findings provide insights for applications based on micro-droplet deposition, such as inkjet/electrohydrodynamic printing and spray coating, to avoid the adverse effect of air cushioning or air entrapment.
URL[Source Record]
Indexed By
Language
English
SUSTech Authorship
Others
Funding Project
National Key Research and Development Program of China[2021YFB3200700] ; National Natural Science Foundation of China["11932009","52175536"] ; Natural Science Foundation of Hubei Province[2020CFA028]
WOS Research Area
Mechanics ; Physics
WOS Subject
Mechanics ; Physics, Fluids & Plasmas
WOS Accession No
WOS:000922189400006
Publisher
ESI Research Field
PHYSICS
Data Source
Web of Science
Citation statistics
Cited Times [WOS]:2
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/501442
DepartmentDepartment of Mechanics and Aerospace Engineering
Affiliation
1.Huazhong Univ Sci & Technol, State Key Lab Digital Mfg Equipment & Technol, Wuhan 430074, Peoples R China
2.Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Peoples R China
3.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Peoples R China
Recommended Citation
GB/T 7714
Tian, Yu,Di, Linsen,Lai, Wuxing,et al. Numerical investigation of air cushioning in the impact of micro-droplet under electrostatic fields[J]. PHYSICS OF FLUIDS,2023,35(1).
APA
Tian, Yu,Di, Linsen,Lai, Wuxing,Guan, Yin,Deng, Weiwei,&Huang, YongAn.(2023).Numerical investigation of air cushioning in the impact of micro-droplet under electrostatic fields.PHYSICS OF FLUIDS,35(1).
MLA
Tian, Yu,et al."Numerical investigation of air cushioning in the impact of micro-droplet under electrostatic fields".PHYSICS OF FLUIDS 35.1(2023).
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