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Model for a pump that drives circulation of pleural fluid
J P Butler1, J Huang, S H Loring
1Harvard School of Public Health, Boston, Massachusetts 02115.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|January 1, 1995
Summary
This study models the lung's pleural space fluid layer using physical and mathematical approaches. Findings reveal fluid layer thickness depends on viscosity, sliding velocity, and pressure, crucial for lung function.
Area of Science:
- Biomechanics
- Fluid dynamics
- Respiratory physiology
Background:
- The pleural space contains a thin fluid layer essential for lung mechanics.
- Understanding the factors maintaining this fluid layer is key to respiratory health.
Purpose of the Study:
- To investigate the mechanism maintaining the pleural fluid layer.
- To develop and validate physical and mathematical models of pleural fluid dynamics.
Main Methods:
- A physical model simulating the lung (membrane with tension) and chest wall (rigid cylinder) with viscous fluid.
- Fluorescence videomicroscopy to measure fluid layer thickness (h).
- Mathematical modeling and numerical analysis of fluid flow.
Main Results:
- Fluid layer thickness (h) increases with viscosity (μ) and sliding velocity (U), and decreases with pressure difference (ΔP).
- Physical and mathematical models showed good agreement.
- A scaling law predicts h ≈ (T/ΔP)(μU/T)²/³.
Conclusions:
- The study successfully models pleural fluid dynamics.
- Predicted physiological fluid layer thickness of ~10⁻³ cm aligns with observations.
- The findings offer insights into lung mechanics and lubrication.