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Area of Science:

  • Fluid dynamics
  • Physics of confined systems
  • Interfacial phenomena

Background:

  • Understanding fluid behavior at small scales is crucial for developing advanced fluidic devices.
  • Extreme confinement, where fluid and device scales match, presents unique challenges.
  • Contact-line friction and geometric confinement significantly influence fluid dynamics.

Purpose of the Study:

  • To investigate fluid dynamics under extreme confinement, a regime termed superconfinement.
  • To identify new stability regimes and control mechanisms for advancing fluid fronts.
  • To develop a theoretical framework quantifying dynamics in superconfined systems.

Main Methods:

  • Experimental measurements of advancing fluid fronts in superconfined geometries.
  • Numerical simulations to analyze the dominance of interfacial forces.
  • Theoretical modeling based on interfacial length scales, specifically contact-line slip length.

Main Results:

  • A novel stability regime for moving fluid fronts was discovered, influenced by contact-line friction and geometry.
  • Unstable fronts transition into drop-emitting jets, modulated by thermal fluctuations.
  • Interfacial forces are identified as the primary drivers of dynamics in superconfined systems.

Conclusions:

  • Length-scale overlap in superconfined systems offers a new method for fluid control.
  • The developed theory accurately quantifies experimental observations in superconfinement.
  • Findings pave the way for designing next-generation fluidic devices leveraging superconfinement effects.