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 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.
Siouffi
M
M
IM2, Technopôle de Château Gombert, Marseille, France.
Deplano
V
V
Pélissier
R
R
D001783:Blood Flow Velocity / Q000502:physiology; D001808:Blood Vessels / Q000000981:diagnostic imaging / Q000503:physiopathology*; D003251:Constriction, Pathologic; D006801:Humans; D008955:Models, Cardiovascular; D011673:Pulsatile Flow; D012212:Rheology / Q000379:methods*; D014463:Ultrasonography