Large curvature effect on pulsatile entrance flow in a curved tube

Model experiment simulating blood flow in an aortic arch

T. Naruse, K. Tanishita

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

We measured the velocity profiles of pulsatile entrance flow in a strongly curved tube using a laser-Doppler anemometer in order to simulate blood flow in the aortic arch under various conditions, i.e., a ratio of tube to curvature radius of 1/3, Womersley parameters of 12 and 18, and peak Dean number up to 1200. Axial isovelocity contours of the cross-section showed the potential vortex to be near the entrance, and with the maximum velocity there being skewed towards the inner wall: thereafter shifting towards the outer wall. During the deceleration phase, reverse axial flow occurred near the inner wall, and a region of this flow extended downstream. The large curvature contributes to the enhancement of the secondary flow and flow reversal, which elevates the wall-shear stress oscillations. The location of elevated wall-shear oscillations corresponds to the vessel wall region where atherosclerotic formation frequently occurs; thereby indicating that both the large curvature and pulsatility play key roles in formation of localized atherosclerotic lesions.

Original languageEnglish
Pages (from-to)180-186
Number of pages7
JournalJournal of Biomechanical Engineering
Volume118
Issue number2
Publication statusPublished - 1996 May
Externally publishedYes

Fingerprint

Pulsatile Flow
Pulsatile flow
Deceleration
Arches
Thoracic Aorta
Lasers
Blood
Shear walls
Axial flow
Secondary flow
Anemometers
Shear stress
Vortex flow
Experiments

ASJC Scopus subject areas

  • Biomedical Engineering
  • Biophysics

Cite this

Large curvature effect on pulsatile entrance flow in a curved tube : Model experiment simulating blood flow in an aortic arch. / Naruse, T.; Tanishita, K.

In: Journal of Biomechanical Engineering, Vol. 118, No. 2, 05.1996, p. 180-186.

Research output: Contribution to journalArticle

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