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Related Experiment Videos

Surfactant effects in model airway closure experiments.

K J Cassidy1, D Halpern, B G Ressler

  • 1Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, USA.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|July 20, 1999
PubMed
Summary

Capillary instability in films can cause airway closure. Surfactants enhance stability, reducing instability growth rates and increasing closure time, as confirmed by theory and experiments.

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Area of Science:

  • Fluid dynamics
  • Biophysics

Background:

  • Airway closure is a critical physiological event.
  • Capillary instability in annular films serves as a model for airway closure dynamics.

Purpose of the Study:

  • To investigate the dynamics of capillary instability in annular films.
  • To model airway closure using fluid dynamics principles.
  • To assess the impact of surfactants on film stability and closure time.

Main Methods:

  • Theoretical modeling of capillary instability growth rates.
  • Bench-top experiments using an oil-water annular film in a glass capillary tube.
  • Varying film thickness by adjusting infusion flow rate.

Main Results:

  • Theoretical predictions align with experimental observations regarding instability growth.

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  • Surfactants significantly decrease instability growth rate (up to 80%) and increase closure time (up to 3.8x).
  • Experimental data supports the theory that critical film thickness for closure increases with surfactant presence.

    • Conclusions:

    • Capillary instability in annular films is a viable model for airway closure.
    • Surfactants play a crucial role in stabilizing thin films, impacting closure dynamics.
    • Findings have implications for understanding and potentially treating conditions involving airway closure.