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http://dx.doi.org/10.5407/jksv.2019.17.2.010

Numerical Simulation of Pulsatile Flows around Micro-Stenosis for Blood Analog Fluids  

Song, Jae Min (Department of Oral and Maxillofacial Surgery, School of Dentistry, PNU)
Hong, Hyeonji (School of Mechanical Engineering, PNU)
Ha, Yi Kyung (College of Nursing, PNU)
Yeom, Eunseop (School of Mechanical Engineering, Pusan National University (PNU))
Publication Information
Journal of the Korean Society of Visualization / v.17, no.2, 2019 , pp. 10-16 More about this Journal
Abstract
Considering the role of viscosity in the hemorheology, the characteristics of non-Newtonian fluid are important in the pulsatile blood flows. Stenosis, with an abnormal narrowing of the vessel, contributes to block blood flows to downstream tissue and lead to plaque rupture. Therefore, systematic analysis of blood flow around stenosed vessels is crucial. In this study, non-Newtonian behaviors of blood analog fluids around the micro-stenosis with 60 % severity in diameter of $500{\mu}m$ was examined by using CFX under the pulsatile flow conditions with the period of 10 s. Viscosity information of two non-Newtonian fluids were obtained by fitting the value of normal blood and highly viscous blood. As the Newtonian fluid, the water at room temperature was used. During the pulsatile phase, wall shear stress (WSS) is highly oscillated. In addition, high viscous solution gives rise to increases the variation in the WSS around the micro-stenosis. Highly oscillating WSS enhance increasing tendency of plaque instability or rupture and damage of the tissue layer. These results, related to the influence on the damage to the endothelium or stenotic lesion, may help clinicians understand relevant mechanisms.
Keywords
Stenosis; Flow Simulation; Pulsatile flow; Non- Newtonian Fluid;
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