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조민태,노형운,서상소,김재수,Cho, Min-Tae,Roh, Hyung-Woon,Suh, Sang-Ho,Kim, Jae-Soo 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.11
The objectives of the present study are to numerically and experimentally investigate the steady and pulsatile flow phenomena in the circular tubes, to quantitatively compare the flow characteristics of Newtonian and non-Newtonian fluids, and to find meaningful hemodynamic information through the flow analysis in the human blood vessels. The particle image velocimetry is adopted to visualize the flow fields in the circular tube. and the results from the particle image velocimetry are used to validate the results of the numerical analysis. In order to investigate the blood flow phenomena in the circular tube. constitutive equations, which are suitable to describe the rheological properties of the non-Newtonian fluids. are determined, and the steady and pulsatile momentum equations are solved by the finite volume prediction. The velocity vectors of the steady and pulsatile flow in the circular tube obtained by the particle image velocimetry arc in good agreement with those by the numerical analysis. For the given mass flow rate. the axial velocity profiles of the Newtonian and the non-Newtonian fluids appear differently. The pulsatile flow phenomena of the Newtonian and the non-Newtonian fluids are quite different from those of the steady flow.
관상동맥내 혈관벽 재형성에 의한 혈류역학적 응력변화에 관한 연구
조민태(Min-Tae Cho),서상호(Sang-Ho Suh),권혁문(Hyuck-Moon Kwon),유상신(Sang-Sin Yoo) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
In this study, changes of shear stress and shear rate are obtained in order to investigate hemodynamic characteristics in the stenosed coronary artery with arterial remodeling. Two models for the arterial remodeling used for this research are a pre-stenotic dialation and a post stenotic dilation models. The wall shear stresses are calculated by the computer simulation. The peak shear stress appeared in the stenotic region of the post-stenotic model. Plaque rupture could be easily occured in the post-stenotic model. The area of negative shear stress values are distributed widely in the post-stenotic model. In the pre-stenotic dilation model, two small recirculation zones are formed, but the shear stresses are lower than in the post-stenotic dilation model. The shear stress on the surfaces of the pre-stenotic dilation model.