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김홍민,최상철,김광용,김병희,임영택,Kim, Hong-Min,Choi, Sang-Cheol,Kim, Kwang-Yong,Kim, Byung-Hee,Lim, Young-Taek 한국유체기계학회 2003 한국유체기계학회 논문집 Vol.6 No.2
Both numerical and experimental studies on the sedimentation efficiency of a sedimentation bed were carried out. Three different structures of sedimentation bed and five different combinations of blockage ratio of center feed wall and angle of distributor are implemented to find the optimal values of geometric parameters. The effect of rotation of the distributor on sedimentation efficiency is also investigated. It reveals that the effects of blockage ratio and angle of distributor on sedimentation efficiency are considerable, while rotation effect can be neglected, and that calculated efficiencies show good agreements with those of experiment, qualitatively.
배관구조에 따른 속도분포 변형과 선회가 오리피스 유량계의 압력차에 미치는 영향에 대한 수치적 연구
김홍민,허재영,김광용,Kim, Hong-Min,Kim, Kwang-Yong,Her, Jae-Young 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.10
Three-dimensional pipe flows with elbows, tees and headers in three different pipe systems are calculated to estimate the effect of asymmetry of axial velocity profile and swirl on measuring accuracy of an orifice flowmeter. It is evaluated how the pressure difference across the orifice is dependent on the upstream straight pipe length and how swirl intensity, swirl angle, and axial velocity distribution affect the measuring error of the orifice flowmeter. From the results, it is found that variation of the pressure difference across the orifice is negligible in case that maximum swirl angle is less than 2$^{\circ}$, and also that the pressure difference across the orifice is more sensitive to the asymmetry of axial velocity profile rather than the swirl intensity.
코넬 공과대학 기숙사 사례를 통한 대학 기숙사의 패시브 하우스 기술 적용에 관한 연구
김홍민,오형석,류수훈,Kim, Hong-Min,Oh, Hyoung-Seok,Ryu, Soo-Hoon 한국교육시설학회 2018 敎育施設 Vol.25 No.4
Global warming is happening now and inevitable. Everyone knows that immediate action should be taken to slow it down, but uncertain about the effective solution. Despite global efforts to reduce greenhouse gas emissions, sea levels are rising gradually. In 2013, Cornell University announced the Climate Action Plan(CAP) to make the campus greener, to reduce waste, and to ensure efficient use of resources. In particular, they set a goal of reducing energy use by 2050 and making carbon emissions to zero. Accordingly, the purpose of this study is to analyse the case of the master plan of Cornell Tech campus and its major buildings. Mainly, The House, faculty and student housing of Cornell Tech and the world tallest certified passive house, will be the main precedent that shows the architectural planning of passive house. Passive house technology, which was thought to be possible only in single-family houses, can be applied to high-rise buildings. If any passive house technology of The House project is actively introduced into the dormitory projects of domestic universities that are about to be built or renovated, it will be a good opportunity for the university to take the lead in preparing for global warming.
난류열전달 향상을 위한 엇갈린 리브가 부착된 열전달면의 형상최적설계
김홍민,김광용,Kim, Hong-Min,Kim, Kwang-Yong 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.9
This study presents a numerical procedure to optimize shape of streamwise periodic ribs mounted on both of the principal walls to enhance turbulent heat transfer in a rectangular channel flow. The response surface method is used as an optimization technique. The optimization is based on Navier-Stokes analysis of flow and heat transfer with $k-{\varepsilon}$ turbulence model. The width-to-height ratio of a rib, rib height-to-channel height ratio and rib pitch to rib height ratio are chosen as design variables. The object function is defined as a function of heat transfer coefficient and friction drag coefficient with weighting factor. Optimum shapes of the rib have been obtained for the range of 0.02 to 0.1 of weighting factor.