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임광옥,이관수,Lim, Kwang-Ok,Lee, Kwan-Soo 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.12
The transition from steady laminar to chaotic convection in a glass melting furnace specified by upper surface temperature distribution has been studied by the direct numerical analysis of the two and three-dimensional time dependent Navier-Stokes equations. The thermal instability of convection roll may take place when modified Rayleigh number($Ra_m$) is larger than $9.71{\times}10^4$. It is shown that the basic flows in a glass melting furnace are steady laminar, unsteady periodic, quasi-periodic or chaotic flow. The dimensionless time scale of unsteady period is about the viscous diffusion time, ${\tau}_d=H^2/{\nu}_0$. Through primary and secondary instability analyses the fundamental unsteady feature in a glass melting furnace is well defined as the unsteady periodic or weak chaotic flow.
일반화된 Hoek-Brown 암반에 굴착된 원형터널의 내공변위 특성 분석
임광옥(Kwang-Ok Lim),이연규(Youn-Kyou Lee) 한국암반공학회 2018 터널과지하공간 Vol.28 No.1
일반화된 Hoek-Brown(GHB) 파괴조건식은 GSI 지수를 통해 현장 암반의 절리상태를 체계적으로 고려하여 암반의 강도를 예측하는 파괴함수로서 암반공학적 설계에 널리 활용되고 있다. 이 연구에서는 절리성 암반에 굴착된 원형터널의 내공변위 특성을 분석하기 위하여 GHB 파괴조건식을 항복함수로 활용한 2차원 탄소성 유한요소해석을 수행하였다. 이 과정에서 소성포텐셜 함수의 가정이 탄소성 변위 해석결과에 미치는 영향도 고찰하였다. 탄소성 해석에서는 넓은 범위의 측압비(K) 변화와 암반의 양호성을 나타내는 GSI 값의 변화가 동시에 고려되었다. 각 측압비에 대해 GSI 값의 변화에 따른 측벽변위/천정변위 비를 계산하여 내공변위 발생특성을 분석하였다. 해석결과 측벽변위/천정변위 비는 측압비의 크기뿐만 아니라 GSI 값의 범위에 큰 영향을 받는 것으로 나타났다. 특히 GSI 값이 매우 작은 불량한 암반의 경우 탄소성해석으로 계산한 측벽변위/천정변위 비는 탄성이론으로 계산한 결과와 반대의 경향을 보였다. 또한 소성포텐셜 함수의 형태에 따른 측벽변위/천정변위 비 변화는 대체로 유사한 경향성을 보이는 것으로 나타났다. Since the generalized Hoek-Brown (GHB) function predicts the strength of the jointed rock mass in a systematic manner by use of GSI index, it is widely used in rock engineering practices. In this study, a series of 2D elasto-plastic FE analysis, which adopts the GHB criterion as a yield function, was carried out to investigate the radial convergence characteristics of circular tunnel excavated in the GHB rock mass. The effect of the plastic potential function on the elasto-plastic displacement was also examined. In the analysis, the wide range of both the K(=σhσv ) and GSI values are considered. For each K value, the variation of the ratio of sidewall displacement to roof displacement was calculated with varying GSI values and the obtained displacement patterns were analysed. The calculation results show that the displacement ratio significantly depends not only on the K value but also on the range of GSI value. In particular, for lower range of GSI value, the displacement ratio pattern calculated in the elasto-plastic regime is opposite to that predicted by the elasticity theory. In addition, the variation of the radial displacement ratio with GSI value for different types of plastic potential function showed similar trend.
300 mm 웨이퍼 위의 에어로졸 나노 입자의 증착 장비 개발을 위한 수치 해석적 연구
안강호,안진홍,이관수,임광옥,강윤호,Ahn, Kang-Ho,Ahn, Jin-Hong,Lee, Kwan-Soo,Lim, Kwang-Ok,Kang, Yoon-Ho 한국반도체디스플레이기술학회 2005 반도체디스플레이기술학회지 Vol.4 No.1
The nanoparticle deposition chamber, which is used for quantum dot semiconductor memory applications, is designed by means of numerical simulation. In this research, the numerical simulations for deposition chamber were performed by commercial software, FLUENT. The deposition of nanoparticles is calculated by diffusion force, thermophoresis and electrophoresis of particles. As a results, when the diffusion force was considered, the most of particles deposited in the wall of deposition chamber. But as considering thermophoresis and electrophoresis of particles, the particles were deposited wafer surface, perfectly.
가정용 응축식 의류건조기의 에너지 효율 개선을 위한 모델링
김정수(Jung Soo Kim),구유선(You Sun Ku),전시문(Si Moon Jeon),홍경섭(Kyung Seop Hong),임광옥(Kwang-ok Lim),이관수(Kwan-Soo Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
We propose a mathematical model on the characteristics of drying process and heat and mass transfer in a domestic condensing dryer to improve its energy efficiency. Experiments are also carried out to verify numerical results. We estimate temperature of the drum and the clothes separately, and perform thermal analysis of the heat exchanger using heat exchangelet method. The numerical results such as drum inlet temperature, RMC, drying time and SEC are in a good agreement with experimental data. A parameter study is also carried out to investigate the effects of each variable on dryer performance.