Model Experiment on Physiologically Intermittent Flow in an Aortic Arch.

Konno, Tadamori; Satoh, Yoshihide; Tanishita, Kazuo

doi:10.1299/jsmec.42.648

Cited by 1 publication

(1 citation statement)

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“…More recent numerical works on flow in curved tubes have examined larger curvature ratios (tube radius to radius of curvature, δ/R) and non-sinusoidal pulsing (Komai & Tanishita 1997). Experimental measurements of aortic arch models have been performed by several researchers confirming the predictions of Lyne and have also documented several higher order instability modes (Chandran 1993;Naruse & Tanishita 1996;Konno, Satoh & Tanishita 1999).…”

Section: Introductionmentioning

confidence: 91%

The influence of inlet velocity profile and secondary flow on pulsatile flow in a model artery with stenosis

Peterson¹,

Plesniak²

2008

J. Fluid Mech.

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The results of an experimental investigation to determine the influence of two physiologically relevant inlet conditions on the flow physics downstream of an idealized stenosis are presented. The two inlet conditions are an asymmetric mean inlet velocity profile and an asymmetric mean inlet velocity profile plus secondary flow, as found downstream of a bend. The stenosis is modelled as an axisymmetric 75 % area reduction occlusion with a length-to-diameter ratio of 2. The flow was forced by a 10-harmonic carotid artery-inspired waveform with mean, maximum and minimum Reynolds numbers of 364, 1424 and 24, respectively, and a Womersley number of 4.6. Laser Doppler velocimetry and particle image velocimetry were used to characterize the spatial and temporal evolution of a baseline case (no disturbances) as well as the two physiologically relevant inlet conditions. The asymmetric inlet velocity profile was found to reduce the region of influence of the stenosis by forcing the stenotic jet towards the tube wall via an induced non-uniform radial pressure gradient, similar to the Coanda effect. Curvature-induced secondary flow was found to play a minor role in the near-stenosis region. Vortex ring formation was relatively unaffected by the mean velocity gradient and secondary flow. Evidence of remnants of the starting vortex ring was observed far downstream in all cases. † Present address:

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