Spatial and temporal variation of secondary flow during oscillatory flow in model human central airways

G. Tanaka, T. Ogata, K. Oka, K. Tanishita

Research output: Contribution to journalArticle

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Axial and secondary velocity profiles were measured in a model human central airway to clarify the oscillatory flow structure during high-frequency oscillation. We used a rigid model of human airways consisting of asymmetrical bifurcations up to third generation. Velocities in each branch of the bifurcations were measured by two-color laser-Doppler velocimeter. The secondary velocity magnitudes and the deflection of axial velocity were dependent not only on the branching angle and curvature ratio of each bifurcation, but also strongly depended on the shape of the path generated by the cascade of branches. Secondary flow velocities were higher in the left bronchus than in the right bronchus. This spatial variation of secondary flow was well correlated with differing gas transport rates between the left and right main bronchus.

Original languageEnglish
Pages (from-to)565-573
Number of pages9
JournalJournal of Biomechanical Engineering
Issue number6
Publication statusPublished - 1999 Dec


ASJC Scopus subject areas

  • Biomedical Engineering
  • Physiology (medical)

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