Fluid dynamics in airway bifurcations: III. Localized flow conditions

Localized flow conditions (e.g., backflows) in transition regions between parent and daughter airways of bifurcations were investigated using a computational fluid dynamics software code (FIDAP) with a Cray T90 supercomputer. The configurations of the bifurcations were based on Schreck s (1972) labo...

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Bibliographic Details
Published in:Inhalation toxicology 2001-04, Vol.13 (4), p.291-305
Main Authors: Martonen, T B, Guan, X, Schreck, R M
Format: Article
Language:English
Subjects:
Bronchi - physiology
Humans
Models, Anatomic
Models, Theoretical
Pulmonary Ventilation
Trachea - physiology
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Summary:Localized flow conditions (e.g., backflows) in transition regions between parent and daughter airways of bifurcations were investigated using a computational fluid dynamics software code (FIDAP) with a Cray T90 supercomputer. The configurations of the bifurcations were based on Schreck s (1972) laboratory models. The flow intensities and spatial regions of reversed motion were simulated for different conditions. The effects of inlet velocity profiles, Reynolds numbers, and dimensions and orientations of airways were addressed. The computational results showed that backflow was increased for parabolic inlet conditions, larger Reynolds numbers, and larger daughter-to-parent diameter ratios. This article is the third in a systematic series addressed in this issue; the first addressed primary velocity patterns and the second discussed secondary currents.
ISSN:0895-8378
1091-7691
DOI:10.1080/089583701750127395