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배황,한용운,Bae, Hwang,Han, Yong Oun 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.11
The turbulence structure of e. tip vortex generated by e. fixed wing was investigated with the use of two-dimensional laser Doppler velocimetry. The velocity field, composed of circumferential end axial components, was measured on the vertical section to the vortex trail, located at 2C downstream from the wing tip in the incoming flow condition of $Re=2.24{\times}10^5$. A quasi 3-dimensional measurement technique by use of 2-dimensional LDV system was suggested for Reynolds stresses and the higher moments. The validity of this technique was confirmed with the uncertainty analysis. The budget of the turbulence kinetic energy was analyzed by those results in the radial direction of the vortex core. It is resulted that the production is to be very likely balanced with the dissipation in most range of the vortex core.
혼합 정맥혈류의 산소와 이산화탄소 분압 예측을 위한 공학적 접근법
배황(Hwang Bae),장근식(Keun-Shik Chang) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
In the present study about pulmonary circulation, we present an engineering approach to estimate the partial pressures of oxygen and carbon dioxide of the mixed venous blood by an iterative numerical method. In this method, the Fick equations for O₂ and CO₂ are first modified so that they appear as a function of the ventilation-perfusion ratio, i.e., V A/Q. We then solve the two modified Fick equations plus the two mass balance equations via the four basic iteration loops. As we compare the present results with the clinical data, we observe that there is a slight underestimation with an error less than 10 % for the partial pressure of oxygen and 5 % for the partial pressure of carbon dioxide. We expect that this new theoretical/numerical study can be used as a fast and reliable noninvasive tool for the clinicians to estimate the partial pressures of O₂ and CO₂ in the mixed venous blood.
배황(Hwang Bae),윤주식(Ju Sig Yoon),박기철(Ki Cheol Park),장근식(Keun-Shik Chang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Three dimensional turbulent flow in the scroll volute of centrifugal compressor has been numerically investigated in this paper by solving the Navier-Stokes equations and k -ε equation model. The computational grid for the flow field of the scroll volute has been constructed based on the multi-block grid, which is good to avoid the central grid singularity as well as to make grid stretching toward the volute wall. Numerical result has been obtained for the three-dimensional flow of scroll volute. The straight conical volute flow is also solved and compared with the scroll volute data. This comparison contributed to comprehend the effect of scroll in the three-dimensional volute flow of a centrifugal compressor.