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김상영,정한식,권순석,Kim, S.Y.,Chung, H.S.,Kwon, S.S. 대한설비공학회 1992 설비공학 논문집 Vol.4 No.4
A mixed convection heat transfer from two vertical parallel plates has been studied numerically by the finite difference method. Effects of the Grashof number, the relative length, $L_2/L_1$. the dimensionless temperature ratio, ${\Phi}_2/{\Phi}_1$ and the dimensionless plate spacing, $b/L_1$ are examined for the heat transfer. Independent of the Grashof numbers and $L_2/L_1$, the dimensionless vertical velocity distributions skewed on the left plate as ${\Phi}_2/{\Phi}_1$ decreased. The dimensionless vertical velocity distribution for $Gr/Re^2=1$ and ${\Phi}_2/{\Phi}_1=1.0$ is skewed to the right plate $L_2/L_1=0.5$, symmetric at $L_2/L_1=1.0$ and skewed to the left plate at $L_2/L_1=1.5$. But for $Gr/Re_2=10.0$ and ${\Phi}_2/{\Phi}_1=1.0$ reversed velocity patterns are obtained. Regardless of the Grashof numbers and $L_2/L_1$, the mean Nusselt nembers on the inside surface of the left plate decreases and those of the right inside surface increases as ${\Phi}_2/{\Phi}_1$ increases. Temperature, velocity and mean Nusselt number distributions are apparently not affected by $L_2/L_1$.
김상영,이재신,권순석,Kim, S.Y.,Ree, J.S.,Kwon, S.S. 대한설비공학회 1991 설비공학 논문집 Vol.3 No.2
The mixed convection heat transfer from vertical inline plates has been studied numerically by the finite difference method and experimentally with Mach-Zehnder interferometer. The dimensionless spacing, $s/L_1$, the relative length, $L_2/L_1$ and the dimensionless temperature ratio, ${\Phi}_2/{\Phi}_1$ are varied parametically. The lower plate mean Nusselt numbers show same values as $s/L_1$, ${\Phi}_2/{\Phi}_1$ and $L_2/L_1$ increase. The upper plate mean Nusselt numbers increase as $s/L_1$ and ${\Phi}_2/{\Phi}_1$ increase, but $L_2/L_1$ decreases. The upper plate mean Nusselt number is higher than the lower plate mean Nusselt for $s/L_1$ 1.8 at Re=100, $Gr=10^4$, Pr=0.71, $L_2/L_1=0.5$ and ${\Phi}_2/{\Phi}_1=1.0$. A comparison between the experimental and numerical results show good agreement.
[論文] 수직 평판의 평행배열과 엇갈린 배열에서 혼합대류 열전달
김상영(S. Y. Kim),정한식(H. S. Chung),권순석(S. S. Kwon) 한국자동차공학회 1993 오토저널 Vol.15 No.3
The mixed convection heat transfer has been studied numerically for misaligned and parrallel arrays of two flat plates at 100≤Re≤700, 0.1≤B≤1.0, 0.2≤Φ_R≤1 Gr=104 and Gr=0.71. For misaligned plates and parallel plates. the optimum plate spacings move to the narrow spacing as Reynolds number and Φ_R increase and can be expressed by the correlation equations at Gr= 10⁴. The optimum plate spacings for parallel plates sharply move to the narrow spacing compared with misaligned plates. The maximum mean Nusselt number of parallel plates shows higher value than that of misaligned plates and can be expressed by the correlation equations at Gr= 10⁴.
김상영(S. Y. Kim),김형익(H. I. Kim),석창성(C. S. Seok),이재권(J. K. Lee),모진용(J. Y. Mo),박득용(D. Y. Park) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
The Residual stress is stress at the inside of materials after plastic deformation. Certainly, this residual stress have an effect on fatigue life. Therefore, it is very important that understanding residual stress at the inside of materials. But in case of U-shaped Pipe that it is dealt with a matter in this paper, distribution of residual stress is very complicated and exactly become unknown caused by difficulty of measurement. Then, in this paper, we are evaluated residual stress at in the inside of materials by finite element program and verified validity by test.
김상영(S. Y. Kim),이재권(J. K. Lee),모진용(J. Y. Mo),구재민(J. M. Koo),석창성(C. S. Seok) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The Residual stress exists in the inside of materials after plastic deformation. Certainly, this residual stress has an effect on fatigue life. Therefore, it is very important to understand the residual stress of the inside of materials. But in case of U-shaped pipe, the distribution of residual stress is very complicated and cannot be exactly unknown for the difficulty of measurement. In this paper, we evaluated the residual stress of the inside of materials by finite element method and verified its reliability by test.