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Related Experiment Videos

Liquid plug flow in straight and bifurcating tubes.

K J Cassidy1, N Gavriely, J B Grotberg

  • 1Department of Mechanical Engineering, Northwestern University, Evanston, IL 60208, USA.

Journal of Biomechanical Engineering
|January 11, 2002
PubMed
Summary

Liquid plugs in airways are studied using benchtop experiments. Findings reveal how plug transport and deposition are affected by airway geometry and liquid presence, crucial for understanding airflow dynamics.

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Area of Science:

  • Fluid Dynamics
  • Biomedical Engineering
  • Respiratory Physiology

Background:

  • Liquid plugs can form in airways due to disease or medical interventions.
  • Ventilation can propel these plugs, leading to fluid deposition on airway walls.
  • Understanding plug behavior in various airway configurations is essential for respiratory health.

Purpose of the Study:

  • To investigate the transport dynamics of finite-length liquid plugs in airways.
  • To analyze the influence of airway geometry (straight vs. bifurcating) and surface conditions (dry vs. pre-wetted) on plug behavior.
  • To quantify fluid deposition and plug splitting under different flow conditions.

Main Methods:

  • Benchtop experiments simulating liquid plug flow in straight and bifurcating tubes.

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  • Varied conditions included dry tubes, pre-wetted tubes, and bifurcations with/without blockages.
  • Measured trailing film thickness and plug splitting ratio as functions of capillary number and plug volume.

    • Main Results:

    • In dry tubes, finite plugs behaved similarly to semi-infinite plugs.
    • Trailing film thickness in pre-wetted tubes depended on capillary number, not initial film thickness.
    • Bifurcations showed even splitting, with deposition influenced by local capillary number; asymmetric flow occurred with daughter blockage, favoring the unblocked path.

    Conclusions:

    • Airway geometry and liquid presence significantly alter liquid plug transport and deposition.
    • Findings provide insights into fluid distribution in respiratory systems, relevant for therapeutic strategies.
    • The study quantifies how factors like blockage and plug volume influence asymmetric fluid distribution.