Experimental analysis of unsteady flows through a stenosis

In this paper we present a study of the post-stenotic velocity flow field corresponding to oscillatory, pulsatile and physiological flow waveforms. Two-dimensional velocity measurements are performed in a 75% severity stenosis using a pulsed Doppler ultrasonic velocimeter. Emphasis is placed on the...

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Bibliographic Details
Published in:Journal of biomechanics 1998-01, Vol.31 (1), p.11-19
Main Authors: Siouffi, M, Deplano, V, Pélissier, R
Format: Article
Language:English
Subjects:
Blood Flow Velocity - physiology
Blood Vessels - diagnostic imaging
Blood Vessels - physiopathology
Constriction, Pathologic
Flow patterns
Humans
Laser Doppler velocimeters
Mathematical models
Medical problems
Models, Cardiovascular
Physiology
Pulsatile Flow
Reynolds number
Rheology - methods
Ultrasonography
Unsteady flow
Velocity measurement
Waveform analysis
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Summary:In this paper we present a study of the post-stenotic velocity flow field corresponding to oscillatory, pulsatile and physiological flow waveforms. Two-dimensional velocity measurements are performed in a 75% severity stenosis using a pulsed Doppler ultrasonic velocimeter. Emphasis is placed on the analysis of the experimental velocity-profile patterns. It is recognized that, beyond the influence of the flow parameters such as the Reynolds number and the frequency parameter, velocity profiles (hence wall-shear stresses) highly depend on the flow waveform. In addition to this analysis, a model of the stenosis influence length is proposed in the case of oscillatory flow.
ISSN:0021-9290