Parametric evaluation of forced expiration using a numerical model

D. Elad, R. D. Kamm

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)192-199
Number of pages8
JournalJournal of Biomechanical Engineering
Issue number3
StatePublished - Aug 1989


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