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Sustaining Robust Cavities with Slippery Liquid-Liquid Interfaces.

Suwan Zhu1, Tao Wu2, Yucheng Bian1

  • 1CAS Key Laboratory of Mechanical Behavior and Design of Materials, Hefei National Laboratory for Physical Sciences at the Microscale, Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, 230026, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|January 17, 2022
PubMed
Summary

Infusing textured spheres with slippery liquid layers promotes stable gas cavity formation during liquid impacts. This method is more effective than dry surfaces for drag reduction and energy savings in transport.

Keywords:
cavity formationdrag reductiondroplet impactslippery surfaceswater entry

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Materials science

Background:

  • Stable gas cavities on surfaces are crucial for drag reduction and energy savings.
  • Achieving this typically requires liquid repellency or a Leidenfrost state.
  • The transformation of solid-liquid interfaces to liquid-vapor interfaces is key.

Purpose of the Study:

  • To investigate a novel method for creating and sustaining stable gas cavities.
  • To compare the efficacy of liquid-infused surfaces versus dry surfaces for cavity formation.
  • To unify the understanding of early lamella dynamics during liquid impacts.

Main Methods:

  • Infusing textured spheres with a smooth, slippery liquid layer.
  • Analyzing water entry dynamics of spheres and drop impacts on planes.
  • Utilizing the curvature ratio as a key parameter.
  • Examining wetting transition phenomena.

Main Results:

  • Liquid-infused spheres create and sustain stable gas cavities more easily and at lower impact velocities than dry spheres.
  • Early lamella dynamics during sphere water entry and drop impact on planes were unified using the curvature ratio.
  • The preferential lamella detachment from slippery surfaces, due to higher lubricant viscosity than air, explains enhanced cavity formation.

Conclusions:

  • Slippery liquid-infused surfaces offer a more facile route to stable gas cavity formation compared to dry surfaces.
  • The findings provide a fundamental understanding of wetting transitions influencing cavity dynamics.
  • This research contributes to the development of energy-efficient transport technologies.