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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.
배황,전지한,윤은구,정영종,임성원,박현식 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.2
The natural circulation phenomena occurring in fully integrated nuclear reactors are associated with aunique formation mechanism. The phenomenon results from a structural feature of these reactorsinvolving upward flow from the core, located in the central-bottom region of a single vessel, anddownward flow to the steam generator in the annulus region. In this study, to understand the naturalcirculation in a single vessel involving a multi-layered flow path, single-phase and two-phase naturalcirculation tests were performed using the SMART-ITL facility, and validation analysis of the TASS/SMR-Scode was performed by comparing the corresponding test results. Three single-phase natural circulationtests were sequentially conducted at 15%, 10%, and 5% of full-scaled core-power without RCP operation,following which a two-phase natural circulation test was successively conducted with an artificialdischarge of coolant inventory. The simulation capability of the TASS/SMR-S code with respect to thenatural circulation phenomena was validated against the test results, and somewhat conservative butreasonably comparative results in terms of overall thermalhydraulic behavior were shown
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.