http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
밀폐용기내 성층화된 유체의 자연대류에 관한 수치적 연구
현명택,이진호,모정하 대한기계학회 1989 대한기계학회논문집 Vol.13 No.6
본 논문에서는 성층화된 용액ㅇ네 수평방향으로 온도구배가 가해지는 경우에 있어서 두 부력인자의 상대적 크기에 따라 나타나는 유동형태와 그에 따른 온도, 농도 분포 및 열전달특성을 수치적으로 연구하고자 한다.
복합부력에 의한 사다리꼴 용기내에서의 유동 형성 과정에 관한 연구
현명택 제주대학교 1992 논문집 Vol.35 No.-
Numerical solutions for double-diffusive convection, subject to the externally imposed horizontal temperature gradient and vertical solute gradient in an equilateral trapezoidal enclosure, are secured. Insepection of the large-time numerical solutions clearly points to the existence of four distinct flow regimes. When N is very small, the overall flow properties are similar to those of a purely thermal convection. For the increasing values of N, the distinguished feature is the emergence of multilayered flow structure. Layered flow structure with stagnant zone is appeared for the relatively high buoyancy ratio. When N is large, the fluid in the bulk of the container is essentially motionless.
유한해석법에 의한 직각 Cavity 내의 유동 및 열전달특성에 관한 연구
최인규,모정하,이진호,현명택 연세대학교 산업기술연구소 1985 논문집 Vol.17 No.1
Flow and heat transfer characteristics in rectangular cavity with varing aspect ratio were investigated numerically in the range of 10?? Re?? 200 and 0.1??Pr?? 1.0. The numerical technique employed is the finite analytic method and it yields very stable solutions up to Reynolds number 200. Numerical results show that the size of upstream vortex for the aspect ratio λ=0.5 is not varied for increasing Reynolds number, but for λ=2.0 its domain expands in the cavity with augmenting value of stream function for increasing Reynolds number. Local Nusselt number on moving wall decreases when the aspect ratio increases for Pr=1.0.
이동원,홍남호,이종문,현명택 濟州大學校工科大學産業技術硏究所 1995 尖端技術硏究所論文集 Vol.6 No.-
A two-layer, solutally-stratified system with a single interface in a square rectangle is simulated. As noted in previous studies, a unicell flow pattern appears in case of relatively lower buoyancy ratio, while global fluid motion does as layered flow pattern with two convective layers. The averaged Nusselt number develops as the same tendency with pure natural convection and convective effect retards as buoyancy ratio increases. There is no effect with Lewis number, but for N≥0.7 the convective effect is much more delayed in Le=10 than in Le=100 and 300.
성층화된 밀폐용기내의 수평방향 온도구배에 의한 자연대류에 관한 실험적 연구
고장권,현명택 濟州大學校工科大學附屬産業技術硏究所 1990 尖端技術硏究所論文集 Vol.1 No.-
Experimental investigations have been conducted to study natural convection of a stably stratified salt-water solution due to lateral heating in a rectangular enclosure of aspect ratio, 3.0. Depending on the buoyancy ratio, N, which represents the relative magnitude of solutal stratification to thermal buoyancy, four distinct flow regimes are observed. Formation and growth of the four layered flow structures is visually observed and described, with the corresponding temperature and concentration distributions in each layer.
성층화된 사다리꼴 용기내에서의 이중확산유동에 관한 수치해석
현명택(M. T. Hyun) 한국해양공학회 1992 韓國海洋工學會誌 Vol.6 No.2
Numerical simulation is made of a stably stratified salt-water solution due to lateral heating in an equilateral trapezoidal enclosure using boundary-fitted coordinate in grid generation. Results show four types of the global fluid pattern depending on the buoyancy ratio in the enclosure, i.e., unicell flow pattern for the low buoyancy ratio, layered flow pattern for the increasing buoyancy ratio, layered flow pattern with stagnant zone for the relatively high buoyancy ratio and stagnant flow pattern for the much higher buoyancy ratio.
낮은 Pr수를 갖는 순수 물질에서의 진동대류에 관한 수치 해석
현명택,홍남호,이동원 濟州大學校工科大學産業技術硏究所 1997 尖端技術硏究所論文集 Vol.8 No.1
Numerical study was investigated to the transient natural convection in a square cavity. The cavity is filled with the pure substance of a low Prandtl number and the vertical walls are constantly maintained different temperature, while the horizontal boundaries are adiabatic. A control volume approach with a central difference scheme is used to formulate the finite difference equations. The results were presented transient Nusselt number, stream function and temperature distribution. It was found that the flow pattern and heat transfer exhibit time-periodic oscillation at various conditions. The average Nusselt number, the amplitude and the frequency of oscillation increases as the Rayleigh number is increased. The increment of Prandtl number makes that the amplitude and the frequency of oscillation reduced, and average Nusselt number increased.