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Related Experiment Videos

Flow through collapsible tubes at high Reynolds numbers

C K Lyon, J B Scott, D K Anderson

    Circulation Research
    |October 1, 1981
    PubMed
    Summary

    This study explored collapsible tube pressure-flow dynamics using the Starling resistor model at high flow rates. New insights into flow instabilities and their potential link to venous hum were revealed.

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    Area of Science:

    • Fluid dynamics
    • Biophysics
    • Cardiovascular physiology

    Background:

    • Collapsible tubes exhibit complex pressure-flow dynamics.
    • The Starling resistor model is crucial for understanding vascular collapse.
    • High flow states, like high cardiac output, require further investigation.

    Purpose of the Study:

    • To investigate pressure-flow relationships in collapsible tubes at high Reynolds numbers.
    • To simulate in vivo conditions like tension, stretch, and dimensions.
    • To explore the cause of venous hum.

    Main Methods:

    • Utilized the Starling resistor model.
    • Simulated high Reynolds numbers (high cardiac output states).
    • Systematically varied parameters: longitudinal tension, stretch, diameter, length, and outflow resistance.

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    Main Results:

    • Observed distinct pressure-flow phases: initial rise, plateau, and a novel late-rising phase.
    • Identified self-induced oscillations during plateau and late-rising phases.
    • Oscillations amplified by tension/stretch, attenuated by increased diameter, length, and outflow pressure.

    Conclusions:

    • The late-rising phase and oscillations represent new findings in collapsible tube dynamics.
    • These instabilities may explain the phenomenon of venous hum.
    • The study provides a model for understanding vascular instabilities in physiological states.