Developing pulsatile flow in the internal carotid artery

Takeshi Naruse, Yoshihiro Nishina, Kenichi Ishihara, Kazuo Tanishita

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Laser Doppler velocity measurements were performed on developing pulsatile flow in a strongly curved tube under flow conditions characteristic of the blood flow in the internal carotid artery called the siphon portion (curvature ratio of 1/2 , Womersley parameter of 5.5 and peak Dean number of 750). The isovelocity contours of the axial direction show the flow development which is similar to the steady flow in a strongly curved tube with a fully developed inlet profile. However it is dissimilar to the steady flow in which imbedded secondary-flow helical motions occur within a large clockwise vortex (Dean type). During the deceleration phase, the reverse axial flow occurs near the inner side of the curvature. The appearance of reverse axial flow contributes to the oscillatory shear index (OSI). The values of OSI, which evaluate the reversed wall shear stress, increase with flow development at the inner side of the curvature and approach zero at the outer side of the curvature. These results show that the values of OSI are higher at the site of the atherosclerotic regions (fibrous plaques or localized cloudy thickening) found in the human internal carotid artery.

Original languageEnglish
Pages (from-to)3018-3025
Number of pages8
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume57
Issue number541
Publication statusPublished - 1991 Sep

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Pulsatile flow
Axial flow
Steady flow
arteries
curvature
Siphons
axial flow
Secondary flow
steady flow
Deceleration
shear
Velocity measurement
Shear stress
Vortex flow
Blood
siphons
tubes
secondary flow
Lasers
deceleration

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Developing pulsatile flow in the internal carotid artery. / Naruse, Takeshi; Nishina, Yoshihiro; Ishihara, Kenichi; Tanishita, Kazuo.

In: Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 57, No. 541, 09.1991, p. 3018-3025.

Research output: Contribution to journalArticle

Naruse, Takeshi ; Nishina, Yoshihiro ; Ishihara, Kenichi ; Tanishita, Kazuo. / Developing pulsatile flow in the internal carotid artery. In: Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B. 1991 ; Vol. 57, No. 541. pp. 3018-3025.
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