JSME International Journal Series C Mechanical Systems, Machine Elements and Manufacturing
Online ISSN : 1347-538X
Print ISSN : 1344-7653
ISSN-L : 1344-7653
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Secondary Flow Augmentation during Intermittent Oscillatory Flow in Model Human Central Airways
Gaku TANAKAKotaro OKAKazuo TANISHITA
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2001 Volume 44 Issue 4 Pages 1041-1050

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Abstract
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.
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© 2001 by The Japan Society of Mechanical Engineers
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