Flow-driven collapse of lubricant-infused surfaces

Lubricant-infused surfaces in an outer liquid flow generally reduce viscous drag. However, owing to the meniscus deformation, the infused state could collapse. Here, we discuss the transition between infused and collapsed states of transverse shallow grooves, considering the capillary number, liquid...

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Bibliographic Details
Published in:Journal of fluid mechanics 2020-10, Vol.901, Article A34
Main Authors: Asmolov, Evgeny S., Nizkaya, Tatiana V., Vinogradova, Olga I.
Format: Article
Language:English
Subjects:
Aspect ratio
Bubbles
Collapse
Contact angle
Deformation
Drag reduction
Fluid dynamics
Fluid mechanics
Grooves
Hydrophobic surfaces
JFM Papers
Liquid flow
Lubricants
Lubricants & lubrication
Viscosity
Viscosity ratio
Viscous drag
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Summary:Lubricant-infused surfaces in an outer liquid flow generally reduce viscous drag. However, owing to the meniscus deformation, the infused state could collapse. Here, we discuss the transition between infused and collapsed states of transverse shallow grooves, considering the capillary number, liquid/lubricant viscosity ratio and the aspect ratio of the groove as parameters for inducing this transition. It is found that, depending on the depth of the grooves, two different scenarios occur. A collapse of lubricant-infused surfaces could happen due to a depinning of the meniscus from the front groove edge. However, for very shallow textures, the meniscus contacts the bottom wall before such a depinning could occur. Our interpretation could help avoid this generally detrimental effect in various applications.
ISSN:0022-1120
1469-7645
DOI:10.1017/jfm.2020.537