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Stability of a directional Marangoni flow.
Corentin Tregouet1, Arnaud Saint-Jalmes1
1Univ Rennes, CNRS, IPR (Institut de Physique de Rennes), UMR 6251, F-35000, Rennes, France. corentin.tregouet@univ-rennes1.fr.
Soft Matter
|September 8, 2020
Summary
Confined Marangoni flows form inertial surface jets, which destabilize into meanders. This study analytically predicts jet velocity profiles and meander wavelengths, validated by experiments.
Area of Science:
- Fluid dynamics
- Surface phenomena
- Surfactant behavior
Background:
- Marangoni flows, driven by surface-tension gradients, are crucial in phenomena like foam dynamics and microswimmer propulsion.
- These flows typically occur over finite surface distances, with secondary flows observable on larger scales.
Purpose of the Study:
- To investigate the behavior of Marangoni flows when laterally confined.
- To characterize the resulting inertial surface jet and its subsequent destabilization.
- To provide an analytical framework for understanding confined Marangoni spreading.
Main Methods:
- Experimental observation of Marangoni flows in a laterally confined system.
- Analytical prediction of the surface jet's velocity profile.
- Quantitative comparison of theoretical predictions with experimental measurements of meander wavelengths.
Main Results:
- Lateral confinement transforms Marangoni flow into an inertial surface jet.
- The velocity profile of this jet was accurately predicted analytically and matched experimental data.
- The straight jet was observed to destabilize into meanders, with critical wavelengths quantitatively agreeing with theory.
Conclusions:
- The study provides a comprehensive understanding of 2D confined Marangoni spreading.
- It highlights the significant role of inertial effects in confined Marangoni flows.
- This work serves as a foundation for further research into Marangoni flow dynamics under confinement.
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