Abstract
A model study was undertaken to investigate disturbances of blood flow through stenotic blood vessels. Both axisymmetric and non-symmetric models, having different diameter ratios of constriction, were used. A sudden decrease in the critical Reynolds number took place as the degree of axisymmetric constriction increased. Two symmetrical standing eddies were noticed within the separated region behind a hemispherical bulge projecting into the boundary layer. Increase in Reynolds number resulted in the formation of secondary flow, the horse-shoe vortex. A striking feature of a pulsatile laminar flow through a circular cylinder was the appearance of reverse flow near the wall at the end of the decelerating phase. The presence of axisymmetric constriction caused pulsatile disturbances. Pulsation seemed to facilitate not only the production of vortices but also the backward spread of turbulence.
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