Patterns of pulsatile flow in arterial models with stenosis

Issue title: Hemorheological Approach to Cardiovascular Diseases. Proceedings of the Satellite Meeting of the IV International Congress of Biorheology, Osaka, Japan, 3 August 1981

Guest editors: Hideyuki Niimi, Takehiko Azuma and Yukihide Isogai

Article type: Research Article

Authors: Fukushima, Takayoshi | Azuma, Takehiko

Affiliations: Research Laboratory for Cardiovascular Diseases and Department of Physiology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, 390, Japan

Abstract: Pulsatile flow in arterial models with an axisymmetric or nonsymmetric stenosis was visualized to investigate the pattern of streamlines and the mode of vortex formation. In a model with an axisymmetric constriction, a decrease in the constriction ratio or a rise in the Reynolds number decreased the magnitude of the acceleration number, which was an index to the unsteadiness of the flow, and facilitated the repetitive shedding of vortex rings which in turn led to the generation of turbulence. The presence of an oscillatory component in flow velocity altered the pattern of steady flow around a non symmetric constriction, which was characterized by a pair of standing vortices behind and a stationary horseshoe vortex in front of the obstacle. In pulsatile flow, nonsymmetric vortex rings were generated periodically behind the obstacle and shed down-stream in succession, and periodical changes also were observed in the position and width of the horseshoe vortex.

Keywords: Pulsatile flow, arterial models, stenosis, streamline patterns, vortex formation, Reynolds number

DOI: 10.3233/CH-1982-21-206

Journal: Clinical Hemorheology and Microcirculation, vol. 2, no. 1-2, pp. 31-41, 1982