Secondary flow augmentation during intermittent oscillatory flow in model human central airways

Gaku Tanaka, Kotaro Oka, Kazuo Tanishita, Hiroshi Wada

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The efficiency of axial gas dispersion during ventilation with high-frequency oscillations (HFO) can be improved by manipulating the oscillatory flow waveform such that intermittent oscillatory flow occurs. To clarify the augmentation of axial gas transfer during intermittent oscillatory flow, we measured the axial and secondary velocity profiles during intermittent oscillatory flow through a model human central airway. We used a rigid model of human airways consisting of asymmetrical bifurcations up to third generation. Velocities in the axial and radial directions were measured with two-color laser-Doppler velocimetry. Secondary flow was accelerated at the beginning of the stationary period, particularly in the trachea, which resulted in enhanced gas transport during intermittent oscillatory flow.

Original languageEnglish
Pages (from-to)1041-1050
Number of pages10
JournalJSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing
Issue number4
Publication statusPublished - 2001 Dec


  • Bifurcating tube
  • Bio-fluid mechanics
  • Oscillatory flow
  • Pipe flow
  • Secondary flow

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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