Parametric Evaluation of Forced Expiration Using a Numerical Model

[+] Author and Article Information
D. Elad

Biomedical Engineering Program, Tel Aviv University, Tel Aviv 69978, ISRAEL

R. D. Kamm

Fluid Mechanics Laboratory, Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

J Biomech Eng 111(3), 192-199 (Aug 01, 1989) (8 pages) doi:10.1115/1.3168365 History: Received March 03, 1989; Revised May 10, 1989; Online June 12, 2009


Numerical calculations were performed to study the influence of several physiologic parameters on a forced expiration. It was found that the axial distribution of airway compliance produced profound changes in the detailed flow pattern, as characterized by the axial distributions of speed index and area ratio, but had little effect on the flow-volume curve. Similar results were obtained when the expression for frictional losses was changed to reflect new experimental results. In contrast, changes in airway size and geometry altered both the detailed flow pattern and the mean expiratory flow rate. The shape of the flow-volume curve remained unchanged.

Copyright © 1989 by ASME
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