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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies with...
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Surface Tension
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Visualization of High Speed Liquid Jet Impaction on a Moving Surface
08:34

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Published on: April 17, 2015

Wetting controls separation of inertial flows from solid surfaces.

Cyril Duez1, Christophe Ybert, Christophe Clanet

  • 1Laboratoire PMCN, Université Lyon 1, UMR CNRS 5586, 69622 Villeurbanne, France.

Physical Review Letters
|April 7, 2010
PubMed
Summary

We found that surface wettability controls liquid trickling from pouring, with superhydrophobic surfaces completely stopping the "teapot effect". This discovery offers new insights into fluid dynamics and surface interactions.

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Wettability phenomena

Background:

  • The

Purpose of the Study:

  • Investigate liquid flow around solid surfaces in the inertial regime.
  • Identify key factors controlling flow separation and liquid trickling.
  • Explore the role of surface wettability in the

Main Methods:

  • Experimental investigation of liquid flow.
  • Analysis of flow separation and trickling phenomena.
  • Application of electrowetting for contact angle actuation.

Main Results:

  • Surface wettability is a critical factor in controlling flow separation and liquid trickling.
  • Trickling is completely suppressed on superhydrophobic substrates.
  • An inertial-capillary adhesion framework successfully explains the observed phenomena.

Conclusions:

  • Surface wettability unexpectedly governs the