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TECHNICAL PAPERS

Viscoelastic Behavior of a Lung Alveolar Duct Model

[+] Author and Article Information
E. Denny, R. C. Schroter

Department for Biological and Medical Systems, Imperial College of Science, Technology, and Medicine, London SW7 2BX, England

J Biomech Eng 122(2), 143-151 (Oct 18, 1999) (9 pages) doi:10.1115/1.429644 History: Received April 07, 1997; Revised October 18, 1999
Copyright © 2000 by ASME
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References

Figures

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(a) Assemblage of truncated octahedra modeling an alveolar duct surrounded by alveoli; (b) front-facing polyhedra are removed to reveal the internal structure of the longitudinal duct airspace
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Geometry of a single truncated octahedron showing the idealized arrangement of fiber bundles along the septal borders and across the septal faces
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Behavior of the visco-elastic connective tissue fiber bundle model: (a) stress response for sinusoidal strain amplitudes of 0.1 at a frequency of 1 Hz over a range of mean operating strains; (b) plot of fiber resistance (Rf) versus mean operating strain; (c) plot of fiber dynamic elastance (Ef) versus mean operating strain
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Behavior of the time-dependent surface tension model: (a) plot of surface tension versus area for three cycling frequencies; (b) plot of surface tension versus area for three sinusoidal area amplitudes of 0.3S0,0.5S0, and 1.0S0, where S and S0 are the current and initial areas, respectively
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Behavior of the alveolar duct model for a vital capacity volume excursion: (a) plot of pressure versus total duct unit volume; (b) plot of surface area-to-volume ratio versus duct unit volume
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Behavior of the alveolar duct model for a tidal volumetric strain amplitude of 8 percent TDC about a mean operating volumetric strain of 60 percent TDC with cycling frequency of 1 Hz: (a) plot of pressure versus duct unit volume; (b) plot of surface area-to-volume ratio versus duct unit volume
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Dependence of the duct model dynamic properties on frequency: (a) plot of duct model resistance (Rti) versus frequency; (b) plot of duct model dynamic elastance (Edyn) versus frequency
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Behavior of the alveolar duct model with smaller alveolar dimensions. The alveolar dimension is defined by L, the septal border length at TDC, relative to L0, the border length of the original model at TDC. The labels refer to two models where L/L0=1.0 and L/L0=0.5: (a) plot of pressure versus duct unit volume; (b) plot of normalized surface area-to-volume ratio versus duct unit volume.

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