Air Entrainment by Viscous Contact Lines
Antonin Marchand, Tak Shing Chan, Jacco H. Snoeijer, Bruno, Andreotti
TL;DR
This study investigates air entrainment by viscous contact lines, revealing a threshold velocity for air film formation and highlighting the significant role of flow within the air film, with notable asymmetry between wetting and dewetting speeds.
Contribution
It uncovers the weak dependence of entrainment speed on viscosity and emphasizes the importance of internal air film flow in air entrainment phenomena.
Findings
Air film forms above a threshold velocity
Entrainment speed weakly depends on liquid viscosity
Wetting speeds are much larger than dewetting speeds
Abstract
The entrainment of air by advancing contact lines is studied by plunging a solid plate into a very viscous liquid. Above a threshold velocity, we observe the formation of an extended air film, typically 10 microns thick, which subsequently decays into air bubbles. Exploring a large range of viscous liquids, we find an unexpectedly weak dependence of entrainment speed on liquid viscosity, pointing towards a crucial role of the flow inside the air film. This induces a striking asymmetry between wetting and dewetting: while the breakup of the air film strongly resembles the dewetting of a liquid film, the wetting speeds are larger by orders of magnitude.
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Taxonomy
TopicsFluid Dynamics and Thin Films · Surface Modification and Superhydrophobicity · Adhesion, Friction, and Surface Interactions