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Pulling Membrane Nanotubes from Giant Unilamellar Vesicles
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Unstable equilibrium behaviour in collapsible tubes.

C D Bertram

    Journal of Biomechanics
    |January 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    This study investigated silicone rubber tube collapse under external pressure and fluid flow. Self-excited oscillations were observed in specific frequency bands, influenced by downstream resistance and external pressure.

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    Area of Science:

    • Fluid Dynamics
    • Materials Science
    • Mechanical Engineering

    Background:

    • Flexible tubes are susceptible to collapse under external pressure, impacting fluid flow.
    • Understanding the dynamics of tube collapse is crucial for various engineering applications.

    Purpose of the Study:

    • To investigate the collapse behavior of a thick-walled silicone rubber tube under external pressure.
    • To analyze the influence of fluid flow and downstream resistance on tube collapse dynamics.
    • To characterize the self-excited oscillations and their frequency bands.

    Main Methods:

    • Externally pressurizing a silicone rubber tube while aqueous fluid flowed through it.
    • Varying downstream flow resistance (R2) and external pressure (pe).
    • Analyzing fluid pressure, flow characteristics, and oscillation frequencies.

    Main Results:

    • Three equilibrium states were identified: stable (high R2), self-excited oscillations (low R2), and unstable (intermediate R2).
    • Non-linear self-excited oscillations occurred in four distinct frequency bands (2.7 Hz, 3.8-5.0 Hz, 12-16 Hz, 60-63 Hz).
    • Supercritical fluid velocities were achieved during oscillations, indicated by pressure-wave velocity comparisons.

    Conclusions:

    • Tube collapse dynamics are complex, exhibiting distinct stable, oscillatory, and unstable regimes.
    • Self-excited oscillations are a significant phenomenon, potentially linked to harmonic modes.
    • External pressure and flow resistance critically influence oscillation suppression and fluid behavior.