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김경훈,고형종,Kim, K.H.,Ko, H.J. 대한설비공학회 1995 설비공학 논문집 Vol.7 No.1
A theoretical model for film condensation of a vapor including a relatively lighter noncondensable gas on a horizontal tube has been formulated on the basis of the conservation laws and other fundamental physical principles. The model is applied to the prediction of the condensation heat transfer characteristics for the Freon vapor in the presence of air on a horizontal tube. Calculated results for the mean heat transfer coefficient, which is shown to depend strongly on the bulk concentration of air, are in good agreement with the available experimental results for a range of operating conditions. The distributions of physical quantities along the surface of tube are also calculated, such as the boundary layer thickness and local heat transfer coefficient. The present model is readily reduced to the Nusselt model as the bulk concentration of air decreases to zero. Therefore, the transition from the condensation of pure vapor to that of vapor-air mixture occurs continuously not abruptly.
우주비행 직후 인체 심혈관계의 혈류역학적 변화에 대한 수치적 연구
심은보(E. B. Shim),고형종(H. J. Ko),T. Heldt,R. D. Kamm,R. G. Mark 한국전산유체공학회 2000 한국전산유체공학회 학술대회논문집 Vol.2000 No.10
Orthostatic stress in human cardiovascular system following spaceflight remains a critical problem in the current lifescience space program. The study presented in this paper is part of an<br/> ongoing effort to use mathematical models to investigate the effects of gravitational stresses on the cardiovascular system of normals and microgravity adapted individuals. We employ a twelve compartment lumped parameter representation of the hemodynamic system coupled to setpoint models of the arterial baroreflex and the cardiopulmonary reflex to investigate the transient response of heart rate to orthostatic stress. We simulate current hypotheses concerning the mechanisms underlying postspaceflight orthostatic intolerance over a range of physiologically reasonable values and compare the simulations to astronaut stand test data pre-and postflight.
심은보(E.B. Shim),고형종(H.J. Ko),윤찬현(C.H. Youn),민병구(B.G. Min) 한국전산유체공학회 2002 한국전산유체공학회 학술대회논문집 Vol.2002 No.-
Flow in the blood sac of the Korean artificial heart is numerically simulated by finite element method. Fluid-structure interaction algorithm is employed to compute the 3D blood flow interacting with the sac material. The motion of the actuator is simplified by a time-varying pressure boundary condition imposed on the outer surface of the sac. Numerical solutions show that there are a strong flow into the outlet and a stagnation flow near the inlet during systole. Shear stress distribution is also delineated to assess the possibility of thrombus formation.
TPLS 혈액주머니 내의 3차원 비정상유동에 대한 수치해석 연구: 액추에이터 속도의 영향
정기석(G.S. Jung),성현찬(H.C. Seang),박명수(M.S. Park),고형종(H.J. Ko),심은보(E.B. Shim),민병구(B.G. Min),박찬영(C.Y. Park) 한국전산유체공학회 2003 한국전산유체공학회 학술대회논문집 Vol.2003 No.-
This paper reports the numerical results far blood flow of the sac squeezed by moving actuator in the TPLS(Twin Pulse Life Support System). Blood flow in the sac is assumed to be 3-dimensional unsteady newtonian fluid. where the blood flow interacts with the sac, which is activated by the moving actuator. The flow field is simulated numerically by using the FEM code, ADINA. It is well known that hemolysis is closely related to shear stress acted on blood flow. According to this fact, we simulate four models with different speed for moving actuator and examine the distribution of shear stress for each model. Numerical results show that maximum shear stress is strongly dependent on the actuator speed.
임기무(K. M. Lim),민병구(B. G. Min),고형종(H. J. Ko),심은보(E. B. Shim) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
The object of this study is to develop a model of the cardiovascular system capable of simulating the short-term transient and steady-state hemodynamic responses such as hypotention and disequilibrium syndrome during hemodialysis or hemofiltration. The model consists of a closed loop 12 lumped-parameter representation of the cardiovascular circulation connected to set-point models of the arterial and cardiopulmonary baroreflexes and 3 compartmental body fluid and solute kinetic model. The hemodialysis model includes the dynamics of sodium, urea, and potassium in the intracellular and extracellular pools, fluid balance equations for the intracellular, interstitial, and plasma volumes. We have presented the results of many different simulations performed by changing a few model parameters with respect to their basal values.
인공심장 sac내의 3차원 유체-구조물 상호작용에 대한 수치적 연구
박명수(M. S. Park),심은보(E. B. Shim),고형종(H. J. Ko),박찬영(C. Y. Park),민병구(B. G. Min) 한국전산유체공학회 2000 한국전산유체공학회 학술대회논문집 Vol.2000 No.5
In this study, the three-dimensional blood flow within the sac of KTAH(Korean artificial heart) is simulated using fluid-structure interaction model. The numerical method employed in this study is the finite element commercial package ADINA. The thrombus formation is one of the most critical problems in KTAH. High fluid shear stress or stagnated flow are believed to be the main causes of these disastrous phenomenon. We solved the fluid-structure interaction between the 3D blood flow in the sac and the surrounding sac material. The sac material is assumed as linear elastic material and the blood as incompressible viscous fluid. Numerical solutions show that high shear stress region and stagnated flow are found near the upper part of the sac and near the corner of the outlet during diastole stage.