Numerical analysis of axial dispersion in an intermittent oscillatory flow

Hideki Fujioka, Gaku Tanaka, Masahiro Nishida, Kazuo Tanishita

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Ventilation by high-frequency oscillation (HFO) has gained widespread attention in clinical medicine because of its potential benefits to respiratory insufficiency. The axial dispersion in oscillatory flow is one of the important factors influencing gas transport during HFO. In this study, the gas transport in sinusoidally oscillatory and intermittent laminar flow in a straight circular pipe was numerically simulated to reveal the mechanism of dispersion. The diffusion of substance was simulated according to the random walk technique and its diffusive nature was evaluated by tracking the path of marked particles. The presence of a stationary period enhances the axial gas transport in the oscillatory flow, and the maximum ratio of effective diffusivity to the molecular diffusivity is twice that of sinusoidal oscillatory flow.

Original languageEnglish
Pages (from-to)3078-3085
Number of pages8
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume59
Issue number566
Publication statusPublished - 1993 Oct

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gas transport
numerical analysis
Numerical analysis
diffusivity
clinical medicine
Gases
oscillations
ventilation
Bioelectric potentials
laminar flow
Laminar flow
random walk
Ventilation
Medicine
Pipe

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Numerical analysis of axial dispersion in an intermittent oscillatory flow. / Fujioka, Hideki; Tanaka, Gaku; Nishida, Masahiro; Tanishita, Kazuo.

In: Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 59, No. 566, 10.1993, p. 3078-3085.

Research output: Contribution to journalArticle

Fujioka, Hideki ; Tanaka, Gaku ; Nishida, Masahiro ; Tanishita, Kazuo. / Numerical analysis of axial dispersion in an intermittent oscillatory flow. In: Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B. 1993 ; Vol. 59, No. 566. pp. 3078-3085.
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