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배태열,정한식,박재림,김시범,권순석 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.2
Natural convection within a wedge-shaped enclosure has been studied by using finite different method. Radial surfaces of the wedge are isothermally hot and cold walls while circumferential surfaces are insulated walls. The Rayleigh numbers change from 10³ to 10^(5). The results show isotherms, streamlines and velocity profiles as well as heat transfer correlations. There is a wedge angle, which minimizes the mean Nusselt number.
부채형 공간내의 자연대류에 대한 간격비와 경사각의 영향
배태열,배대석,권순석 대한기계학회 1992 대한기계학회논문집 Vol.16 No.11
본 연구에서는 크기가 45˚인 부채형 공간내의 자연대류 열전달 특성을 고찰 하기 위하여 간격비, 경사각 그리고 Rayleigh 수를 변수로 하여 유한 차분법으로 수치 해석 하고, 대료적인 간격비 L/r$_{i}$=1.6에서 Ra=2.51*$10^{4}$ 및 Pr=0.71일때, Machzehnder 간섭계를 사용하여 실험 하였으며, 수치해석과 실험결과를 비교하였다. Two-dimensional natural convection within a circular trapezoidal cavity with parallel cylindrical top and bottom walls at different temperatures and two adiabatic side walls has been solved by finite-difference methods. This study has been conducted to evaluate the effects of aspect ratio and inclination in the natural convection for various Rayleigh numbers. The minimum average Nusselt number occurs at the point of transition from a conductive heat transfer to a convective heat transfer. Numerical results are compared to experimental results with qualitatively good agreement.
배태열,권순석,Bae, T.Y.,Kwon, S.S. 대한설비공학회 1994 설비공학 논문집 Vol.6 No.3
Natural convection within a wedge-shaped enclosure has been studied numerically by finite difference method. Radial surfaces of the wedge are isothermally hot and cold while circumferential surfaces are insulated. Results show isotherms, streamlines and velocity profiles as well as Nusselt number distributions for a Rayleigh number range of $10^3$ to $10^5$. In addition, it is found that there is a wedge angle as shown the minimum mean Nusselt number for using an insulated enclosure.
배태열,배태석,권순석,Bae, T.Y.,Bai, D.S.,Kwon, S.S. 대한설비공학회 1992 설비공학 논문집 Vol.4 No.1
The natural convection heat transfer within a trapezoidal enclosure with parallel cylindrical top and bottom walls at different temperatures and two adiabatic side walls are studied. A finite-difference method has been used to solve the governing equations numerically. The range of parameters studied herein are Prandtl number 0.7, aspect ratio from 0.5 to 4.0, Rayleigh number from $10^3$ to $3{\times}10^4$, enclosure tilt angle from 22.5 to 157.5 degrees. Mean and local Nusselt numbers are presented for discussing heat transfer characteristics within the enclosure. The heat balances for the hot and cold walls are differed by less than 1% for converged solutions, so these results appear to be reasonable.
수직 단열 격판을 가진 등온 환상공간에서의 자연대류 열전달
배태열,김시범,권순석 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.1
The natural convection heat transfer problem between two horizontal isothermal cylinders with adiabatic spacers is solved by a numerical method. A finite-difference method was used to solve the governing equations. The results show velocity and temperature distributions, and mean Nusselt numbers are shown by Nu ̄=C(Ra_(L))^(m).
부채형 밀폐공간내에서의 자연대류 열전달에 대한 공간각의 영향
배태열(Bae Tae-Yeol),권순석(Kwon Sun-Suk) 한국태양에너지학회 1993 한국태양에너지학회 논문집 Vol.13 No.1
온도가 다른 평행한 원형 벽 2개의 단열 벽으로 구성된 부채형 밀쳬 공간 내에서의 자연대류 열전달 현상을 유한 차분법으로 수치해석 하였다. Rayleigh수 10³-10^5, 공간각 30˚~180~의 범위에서 온도 분포 및 속도 분포를 나타내고 평균 Nusselt수를 /Nu=C(Ra_l)^m의 형태로 나타내었다. A numerical study of natural convection heat transfer confined by circular parallel walls at different temperatures and flat adiabatic walls is investigated for Rayleigh numbers from 10³ to 10^5 and sectorial angles from 30˚ to 180˚. It is used by a finite difference method to solve the governing equations. The results show velocity and temperature distributions.<br/> Mean Nusselt numbers are shown by /Nu = C(Ra_l)^m