1999
DOI: 10.1007/bf02480063
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Measurements of steady flow velocity and turbulent stress downstream from jellyfish and St. Vincent aortic heart valves

Abstract: An experimental investigation was conducted to determine the velocity fields, magnitudes of shear stresses, and regions of stagnation of a jellyfish valve and a St. Vincent tilting-disk valve using laser Doppler anemometry (LDA). All experiments were performed in vitro and at steady volumetric flow rates of 15 and 261/min (representing peak systole). The St. Vincent valve flow field was very unsymmetrical in the measurement plane that spanned the major and minor outflow regions of the valve and persisted at le… Show more

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Cited by 3 publications
(3 citation statements)
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“…In an attempt to understand valve dynamics, researchers have traditionally relied on experimental techniques to analyze the complex motion of the valve mechanics. Various experimental tools have been used, including echocardiography (69, 70), particle image velocimetry (PIV) (7174), and laser Doppler velocimetry (LDV) (1114, 75, 76). However, these studies used a very simplified configuration of the valves and neglected (or at least oversimplified) the effect of the sinus of Valsalva and effect of circulations within these cavities on the valve dynamics (12).…”
Section: Bioengineering Strategies For Tehvmentioning
confidence: 99%
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“…In an attempt to understand valve dynamics, researchers have traditionally relied on experimental techniques to analyze the complex motion of the valve mechanics. Various experimental tools have been used, including echocardiography (69, 70), particle image velocimetry (PIV) (7174), and laser Doppler velocimetry (LDV) (1114, 75, 76). However, these studies used a very simplified configuration of the valves and neglected (or at least oversimplified) the effect of the sinus of Valsalva and effect of circulations within these cavities on the valve dynamics (12).…”
Section: Bioengineering Strategies For Tehvmentioning
confidence: 99%
“…In formulating the problem mathematically, the unsteady, 3-dimensional (3D) Navier-Stokes equations for an incompressible, non-Newtonian fluid, with or without turbulence models, using either finite volume or finite element techniques, have been adapted (89, 106). It should be noted that the assumption of turbulence, around 7% across the valve, can significantly affect the scale of the shear stresses and has been observed in vitro (1214, 93, 107).…”
Section: Bioengineering Strategies For Tehvmentioning
confidence: 99%
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