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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Print: 2152-5102
ISSN Online: 2152-5110

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v29.i1.50
24 pages

Modeling of Noise Generation by a Vascular Stenosis

A. O. Borisyuk
Institute of Hydromechanics of the National Academy of Sciences of Ukraine, Zhelyabov Str., 8/4, 03680, Kyiv-180, MSP, Ukraine

ABSTRACT

An in-vitro experiment is carried out in order to study the properties of an acoustic field in the human chest produced by flow in a larger, blood vessel. The cases of intact and partially occluded vessels are considered, and abrupt rigid-wall hollow axisymmetric cylindrical plugs of varying inner diameters and lengths are used as stenoses. The analysis of the noise fields reveals the characteristic signs of the presence of a stenotic obstruction in the vessel. These are the general increase of the noise levels and production of the new frequency components in the power spectrum. The components are identified with the characteristic frequencies of vortex formation in the disturbed flow region behind a stenosis and the resonance frequencies of vibrations of the poststenotic segment of vessel. The stenosis generated acoustic power is found to be approximately proportional to the fourth power of the constriction severity and fourth power of the flow's Reynolds number.


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