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Related Experiment Videos

Valve dynamics

S Rodbard, L Russin, G Duesdieker

    Medical Research Engineering
    |January 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Fluid flow through elastic valve leaflets can cause silent passage or audible flutter. Flutter, an acoustic oscillation, depends on pressure, leaflet tension, and thickness, potentially explaining heart murmurs.

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    Area of Science:

    • Fluid dynamics
    • Biomechanics
    • Acoustics

    Background:

    • Flow through elastic structures can exhibit complex behaviors.
    • Understanding valve dynamics is crucial for diagnosing cardiovascular conditions.

    Purpose of the Study:

    • To investigate the fluid dynamics of flow between elastic valve leaflets.
    • To characterize the conditions leading to silent flow versus acoustic oscillation (flitter).

    Main Methods:

    • Analysis of fluid flow between two contiguous elastic sheets.
    • Mathematical modeling of leaflet behavior under varying pressure differences.

    Main Results:

    • At low pressures, silent flow occurs, with aperture dependent on orifice length, pressure, and leaflet thickness.

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  • At higher pressures, leaflets exhibit flitter, an acoustic oscillation.
  • Flitter recurrence rate correlates with leaflet tension and inversely with thickness.
  • Flitter onset threshold depends on pressure, aperture length, wall tension, and thickness.

    • Conclusions:

    • The study elucidates the mechanisms behind silent flow and flitter in elastic valves.
    • Findings provide insights into the generation of sounds and murmurs in biological systems like heart valves and vocal cords.