中文版 | English
Title

Air entrapment of a neutral drop impacting onto a flat solid surface in electric fields

Author
Corresponding AuthorDeng, Weiwei; Huang, YongAn
Joint first authorTian, Yu; Liu, Yanchu
Publication Years
2022-08-04
DOI
Source Title
ISSN
0022-1120
EISSN
1469-7645
Volume946
Abstract

When a charge neutral drop impacts on a flat solid substrate, a small air bubble is always trapped underneath due to the lubrication pressure coming from the viscous stress in the squeezed air film. Herein we find experimentally and numerically that the process of the air entrapment and the initial contact state of the drop with the substrate can be profoundly altered via an external electric field. In an electric field, the induced electric stresses at the bottom of the drop increase drastically right before the drop contacts the substrate, which acts against the lubrication pressure, resulting in reduced initial contact radius and air bubble size. When the external electric field reaches a critical value, the electrical stress accelerates the flow near the bottom of the drop and generates a conical tip quickly instead of a dimple, resulting in a centre contact and eliminating the air bubble entrapment. Based on the dipole mirror charge model, we find the dimensionless strength of critical electric field scales with the square root of capillary number based on the air viscosity. This scaling law of the critical electric field for eliminating the air bubble entrapment is verified experimentally and numerically. This work may offer a new way to mitigate defects caused by air bubble entrapment for inkjet printing and droplet-based additive manufacturing.

Keywords
URL[Source Record]
Indexed By
SCI ; EI
Language
English
SUSTech Authorship
Corresponding
Funding Project
National Key Research and Development Program of China[2021YFB3200700] ; National Natural Science Foundation of China[
WOS Research Area
Mechanics ; Physics
WOS Subject
Mechanics ; Physics, Fluids & Plasmas
WOS Accession No
WOS:000835850100001
Publisher
EI Accession Number
20223312573978
EI Keywords
Lubrication
ESI Classification Code
Lubrication:607.2
ESI Research Field
ENGINEERING
Data Source
Web of Science
Publication Status
正式出版
Citation statistics
Cited Times [WOS]:3
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/375573
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.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Peoples R China
3.Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Peoples R China
4.Huazhong Univ Sci & Technol, Sch Mech Sci & Engn, Wuhan 430074, Peoples R China
Corresponding Author AffilicationDepartment of Mechanics and Aerospace Engineering
Recommended Citation
GB/T 7714
Tian, Yu,Liu, Yanchu,Peng, Zihan,et al. Air entrapment of a neutral drop impacting onto a flat solid surface in electric fields[J]. JOURNAL OF FLUID MECHANICS,2022,946.
APA
Tian, Yu.,Liu, Yanchu.,Peng, Zihan.,Xu, Chenghao.,Ye, Dong.,...&Huang, YongAn.(2022).Air entrapment of a neutral drop impacting onto a flat solid surface in electric fields.JOURNAL OF FLUID MECHANICS,946.
MLA
Tian, Yu,et al."Air entrapment of a neutral drop impacting onto a flat solid surface in electric fields".JOURNAL OF FLUID MECHANICS 946(2022).
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