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Shear-driven failure of liquid-infused surfaces
Jason S Wexler1, Ian Jacobi1,2, Howard A Stone1
1Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, USA.
Physical Review Letters
|May 9, 2015
Summary
Liquid-infused surfaces offer unique properties but can fail when lubricating films drain under shear. This study reveals that patterned surfaces retain liquid indefinitely due to wicking, preventing failure.
Area of Science:
- Surface science
- Fluid dynamics
- Materials science
Background:
- Liquid-infused surfaces (LIS) mimic superhydrophobic properties.
- LIS face a failure mode: shear-driven liquid film drainage.
- Understanding and mitigating LIS failure is crucial for applications.
Purpose of the Study:
- Investigate shear-driven drainage in LIS.
- Identify mechanisms preventing liquid film loss.
- Develop strategies to enhance LIS stability.
Main Methods:
- Experimental examination of patterned surfaces under shear flow.
- Development of an analytical model for fluid retention.
- Analysis of geometric surface parameters influencing wicking.
Main Results:
- Patterned surfaces exhibit indefinite liquid retention against shear flow.
- Wicking ability of patterned surfaces prevents complete drainage.
- Steady-state liquid retention is analogous to capillary rise.
- Geometric parameters govern fluid retention on various patterns.
Conclusions:
- LIS stability can be enhanced by surface patterning and wicking.
- Surface geometry is key to preventing shear-driven drainage.
- The findings offer a pathway to design robust LIS for practical use.
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