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

Published online by Cambridge University Press:  10 December 2008

SEAN D. PETERSON  and
MICHAEL W. PLESNIAK
SEAN D. PETERSON
Affiliation:
Department of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, [email protected]
MICHAEL W. PLESNIAK
Affiliation:
Department of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, [email protected]
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Abstract

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.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 616 , 10 December 2008 , pp. 263 - 301
Copyright
Copyright © Cambridge University Press 2008

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