Large curvature effect on pulsatile entrance flow in a curved tube: Model experiment simulating blood flow in an aortic arch

T. Naruse, K. Tanishita

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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

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ASJC Scopus subject areas

  • Biomedical Engineering
  • Biophysics

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