Local gas transport rate in oscillatory flow in a model human central airways

Gaku Tanaka*, Jin Ito, Kotaro Oka, Kazuo Tanishita

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter

4 Citations (Scopus)


The rate of local axial gas transport in oscillatory flow through a model human central airways was measured to evaluate the gas exchange during high-frequency oscillation. A rigid model of human airways consists of asymmetrical bifurcations up to third generation, of which geometries were determined by the study of Horsfield et. al. (1971). A bolus of CO 2 tracer was injected into the trachea, and effective diffusivities as a function of location in the airways were obtained by CO 2 washout profiles. The rate of increase of effective diffusivity depends on the local flow conditions and differs with branches. The effective diffusivity in the left main bronchus becomes 3 times greater than that in the straight tube, whereas no significant effect is observed in the right main bronchus.

Original languageEnglish
Title of host publicationAmerican Society of Mechanical Engineers, Bioengineering Division (Publication) BED
Number of pages2
Publication statusPublished - 1996
Externally publishedYes

ASJC Scopus subject areas

  • General Engineering


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