REGURGITANT FLOW JETS IN MECHANICAL HEART VALVES: FLUID STRESSES AND SPATIAL CORRELATION

In the present study, regurgitant flow in MHVs is studied with noninvasive velocimetry, addressing fluid stresses and self-similarity of the velocity field. A suitably designed physical model of the regurgitant flow was used for the measurements. The prosthetic valve under test was seated coaxially...

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Bibliographic Details
Published in:International journal of artificial organs 2014-01, Vol.37 (8), p.623-623
Main Authors: D'Avenio, G, Wang, G, Daniele, C, Grigioni, M
Format: Article
Language:English
Subjects:
Computational fluid dynamics
Fluid flow
Fluids
Hinges
Planes
Self-similarity
Stresses
Valves
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Summary:In the present study, regurgitant flow in MHVs is studied with noninvasive velocimetry, addressing fluid stresses and self-similarity of the velocity field. A suitably designed physical model of the regurgitant flow was used for the measurements. The prosthetic valve under test was seated coaxially with a 12-face prism, enabling easy optical access. This model was inserted in a closed flow loop, with regurgitant steady flow, which allowed to avoid the effect of leaflet repositioning in successive cycles. A Particle Image Velocimetry (PIV) investigation was carried out on currently marketed MHVs, by measuring the 2D flow field at several planes parallel to the hinges' plane. The distribution of the jets exiting the valve, mainly from the hinge corners, was observed. Low peak TSSmax and viscous stress values were found. Different self-similarity properties of the flow field were found, with regard to the direction of the vector distance defining the argument of the AF.
ISSN:0391-3988
DOI:10.5301/ijao.5000347