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수평원관속에 동심으로 놓여있는 얼음 봉의 융해현상에 관한 보험적 연구
이동욱,유상신,Lee, Dong-Wook,Yoo, Sang-Sin 대한설비공학회 1986 설비저널 Vol.15 No.2
The melting phenomena of horizontal cylindrical ice-bar immersed in water and air concentrically in the cylinder are experimentally investigated for the temperature range from $3.5^{\circ}C\;to\;2.5^{\circ}C$. The shapes of the melting ice-bar are recorded photographically by the shadowgraph method. The shadowgraphs of the melting ice-bar show that water adjacent to the bar flows upward for the temperature range from $3.5^{\circ}C\;to\;5.8^{\circ}C$ while above $5.8^|\circ}C$ the flow is downward direction. The local and average Nusselt numbers are obtoined with the recorded shadowgraphs and comparator. Melting shapes of the ice-bar in the air show the vortex motion in the bottom portion of the bar, whereas no vortex motion appears in the bottom portion when the bar is melted in the water.
서상호,유상신,노형운,Suh, Sang-Ho,Yoo, Sang-Sin,Roh, Hyung-Woon 대한의용생체공학회 1997 의공학회지 Vol.18 No.2
The three-dimensional flow analysis using the finite volume method is presented to compare the steady flow characteristics of blood with those of blood substitutes such as water and aqueous polymer solution in an idealized double branching model. The model is used to simlllate the region of the abdominal aorta near the celiac and superior mesenteric branches. Apparent viscosities of blood and the aqueous Separan solution are represented as a function of shear rate by the Carreau model, Water and aqueoiu Separan AP-273 500wppm solution are frequently used as blood substitutes in vitro experiments. Water is a typical Newtonian fluid and blood and Separan solution are non-Newtonian fluids. Flow phenomena such as velocity distribution, pressure variation and wall shear stress distribution of water, blood and polymer solution are quite different due to differences of the rheological characteristics of fluids. Flow phenomena of polymer solution are qualitatively similar to those of blood but the phenomena of water are quite different from those of blood and polymer solution. It is recommended that a lion-Newtonian fluid which exhibits very similar rheological behavior to blood be used in vitro experiments. A non-Newtonian fluid whose rheological characteristics are very similar to those of blood should be used to obtain the meaninylll hemodynamic data for blood flow in vitro experiment and by numerical analysis
협착이 발생된 관상동맥의 보상적 재형성과 혈류역학적 인자의 상관관계
서상호(Sang-Ho Suh),조민태(Min-Tae Cho),권혁문(Hyuck-Moon Kwon),유상신(Sang-Sin Yoo) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
Atherosclerotic arteries show a tendency to undergo compensatory vascular enlargement during the early stage of plaque accumulation. The objective of the present study is to investigate the relationship between the compensatory remodelling of the stenosed coronary artery and hemodynamic stresses. Two models for the compensatory remodelling are a pre-stenotic dilation and a post-stenotic dilation models. The boundary condition at inlet is set to have the same flow rate for two models. and the wall shear stresses in two models are calculated by the computer simulation. The peak wall shear stress on the post-stenotic model is higher than that of the pre-stenotic model. Two recirculation zones are generated in the pre-stenotic model, and the zones in the pre-stenotic model are smaller than those in the post-stenotic model. Variation of the wall shear stress in the pre-stenotic model is lower than those in the post-stenotic model.
서상호,유상신,민병구,장준근,Suh, Sang-Ho,Yoo, Sang-Sin,Min, Byung-Gu,Chang, Jun-Keun 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.11
The objective of this study is to investigate the effects of the hemodynamics on the morphological changes of the human endothelial cells due to the blood flow by in vitro experiment and computer simulation. The morphological changes of the endothelial cells due to the t10w shear stress were observed in the laminar t10w chamber as a function of the exposure time. The observed shapes of the endothelial cells are used to the model shapes of the endothelial cells for numerical study and the pressure and the wall shear stress variations around the endothelial cells are calculated from the numerical results. The endothelial cells elongate along the t10w direction and lessen their heights in the flow field to reduce the pressure and the wall shear stress on the surface.