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Avalanches and Extreme Value Statistics of a Mesoscale Moving Contact Line
Caishan Yan1, Dongshi Guan2,3, Yin Wang1
1Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
Physical Review Letters
|March 8, 2024
Summary
We measured the stick-slip motion of a liquid-air interface on a rough fiber. The capillary force showed fluctuations, with depinning dynamics matching extreme value statistics and avalanche dynamics.
Area of Science:
- Physics
- Materials Science
- Fluid Dynamics
Background:
- Understanding contact line (CL) dynamics is crucial for fluid behavior on surfaces.
- Stick-slip motion is common in systems with rough surfaces and defects.
Purpose of the Study:
- To directly measure the pinning-depinning dynamics of a circular contact line.
- To statistically characterize contact line motion over a rough surface.
Main Methods:
- Utilized atomic force microscopy to measure capillary forces.
- Analyzed stick-slip events and force fluctuations.
- Applied extreme value statistics and avalanche dynamics analysis.
Main Results:
- Observed sawtoothlike capillary force fluctuations during CL motion.
- Found force accumulation (stick) followed by sharp release (depinning).
- Demonstrated that depinning force follows extreme value statistics and slip length is proportional to force release, consistent with the ABBM model.
Conclusions:
- Provided a statistical description of mesoscale contact line dynamics.
- The findings have implications for understanding stick-slip motion in random landscapes.
- Validated the ABBM model for contact line depinning dynamics.
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