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Related Experiment Videos

Mucus transport by cough

P W Scherer

    Chest
    |December 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Coughing expels mucus by creating high-velocity gas flow. This study quantifies serous layer velocities in the bronchial tree, finding them significant down to the 12th generation in healthy individuals.

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    Area of Science:

    • Fluid dynamics
    • Respiratory physiology
    • Biomedical engineering

    Background:

    • Coughing is a vital airway clearance mechanism.
    • Understanding the fluid dynamics of cough is crucial for respiratory health.
    • Previous models lacked quantitative analysis of serous layer velocity.

    Purpose of the Study:

    • To quantitatively estimate serous layer velocities induced by a cough.
    • To analyze the forces governing liquid layer flow during simulated cough.
    • To compare cough-induced velocities with normal mucociliary clearance.

    Main Methods:

    • Simulated cough experiments using Newtonian and non-Newtonian liquids in a straight tube.
    • Analysis of steady-state shear force balance between gas and liquid layers.

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  • Mathematical modeling to estimate serous layer velocities in bronchial tree generations.

    • Main Results:

    • A steady-state shear force balance governs liquid layer flow during simulated cough.
    • Cough-induced serous layer velocities are significant down to the 12th bronchial generation in healthy individuals.
    • Velocities increase linearly with serous layer thickness (ls) and decrease with viscosity (μs).

    Conclusions:

    • Coughing generates significant fluid velocities capable of clearing mucus from deep within the lungs.
    • The findings provide a quantitative basis for understanding cough effectiveness in airway clearance.
    • Serous layer properties (thickness and viscosity) are critical determinants of cough-induced fluid transport.