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Surfaces submerged in water stay dry by trapping gas in roughness valleys. New research identifies a critical roughness scale to prevent gas dissolution and vapor condensation, maintaining dry surfaces.

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Area of Science:

  • Surface science
  • Fluid dynamics
  • Materials science

Background:

  • Rough surfaces under water can remain dry if gas is trapped in roughness valleys.
  • Existing studies focus on preventing liquid invasion but overlook gas dissolution and vapor condensation.
  • These overlooked factors are critical for maintaining dry immersed surfaces.

Purpose of the Study:

  • To investigate the mechanisms of gas dissolution and vapor condensation in immersed rough surfaces.
  • To identify the critical roughness scale that sustains trapped gas or water vapor.
  • To ensure immersed surfaces remain practically dry.

Main Methods:

  • Theoretical predictions
  • Molecular dynamics simulations
  • Experimental validation

Main Results:

  • Identified a critical roughness scale for maintaining dry surfaces.
  • Demonstrated that below this scale, vapor phase and/or trapped gases can be sustained.
  • Theoretical predictions align with simulation and experimental results.

Conclusions:

  • The critical roughness scale is essential for preventing liquid invasion via gas dissolution or vapor condensation.
  • This finding is crucial for designing and maintaining dry surfaces in submerged environments.
  • The study provides a fundamental understanding for advanced material design.