Effect of intertmittency on axial dispersion in an asymmetrical oscillatory flow

Hideki Fujioka*, Kazuo Tanishita

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The axial dispersion in oscillatory flow is one of the important factors influencing the gas transport during HFO. Recently, requirement for HFO is increasingly diversified. The mucus clearance is one of important thing for HFO. And it was proved that the difference flow rate between inspiration and expiration oscillation was effective for mucus clearance. According to our latest study, the dispersion in an oscillatory flow can be improved by introducing the stationary period right after the diffusing particle experiences the largest movement because of its lateral mixing effect during the stationary period. In this study the numerical simulation on the gas transport in asymmetrical oscillatory laminar flow in a straight circular pipe was carried out for improvement of gas transport. The presence of stationary period enhances the axial gas transport in an asymmetrical oscillatory flow and maximum ratio of effective diffusivity to the molecular diffusivity doubles than that of sinusoidal oscillatory flow.

Original languageEnglish
Title of host publicationAmerican Society of Mechanical Engineers, Bioengineering Division (Publication) BED
EditorsJohn M. Tarbell
Place of PublicationNew York, NY, United States
PublisherPubl by ASME
Number of pages4
ISBN (Print)0791810313
Publication statusPublished - 1993
Externally publishedYes
EventProceedings of the 1993 ASME Winter Annual Meeting - New Orleans, LA, USA
Duration: 1993 Nov 281993 Dec 3


OtherProceedings of the 1993 ASME Winter Annual Meeting
CityNew Orleans, LA, USA

ASJC Scopus subject areas

  • Engineering(all)


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