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연속적으로 누출되는 액체 풀의 확산에 관한 고차 섭동해
김명배(Myungbae Kim),도규형(Kyu Hyung Do),한용식(Yongshik Han),최병일(Byungil Choi) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.9
연속적으로 누출되면서 원형으로 퍼져가고 있는 액체에 대한 모델에 대한 고차 섭동 해를 구하여 1차 섭동 해를 개선하였다. 일반적인 해를 얻기 위하여 무차원화된 지배방정식을 유도하고 무차원 지배 변수를 도출하였다. 무차원 증발계수를 섭동 변수로 이용하였다. 계산 결과 부피 및 확산 반경에 관해서 고차 섭동해가 1차 섭동 해를 개선시키고 있으며, 섭동해의 차수가 증가함 따라 오차를 감소시키는 경향을 보였다. 3차 섭동 해는 수치 해와 거의 일치하고 있어 3차 섭동해의 타당성을 보여주고 있다. High-order perturbation solutions have been obtained for the simple physical model describing the liquid pool spreading with a continuous spill, and these are shown to improve over first-order perturbation solutions. The non-dimensional governing equations for the model are derived to obtain more general solutions. Non-dimensional parameters are sought as the governing parameters for the non-dimensional equations, and the non-dimensional evaporation rate is used as the perturbation parameter. The results show that the high-order solutions exhibit an improvement over the first-order solutions with respect to the pool volume as well as the spreading radius. In addition, as the order of the perturbation solutions increases, the difference between the numerical solutions and the perturbation solutions is significantly reduced. Finally, it is revealed that the third-order solutions are reasonable because they almost agree with the numerical solutions.
김명배(Myungbae Kim),도규형(Kyuhyung Do),한용식(Yongshik Han),최병일(Byungil Choi) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
In the present work the equations of the simple physical model with vaporization are solved semi-analytically for the first time using mathematical method called perturbation techniques. We use an evaporation rate per unit area as a perturbation parameter, and first order solutions are obtained for continuous and instantaneous release.
최병일(Byungil Choi),김명배(Myungbae Kim),한용식(Yongshik Han),정경열(Kyungyul Chung),박창대(Changdae Park) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Plant availability and safety are affected by the risk of the plant strongly. To reduce the risk, the efforts in every life cycle (plant design, plant equipment procurement and plant operation) of the plant industry are needed. In this paper, we introduce ICT convergence technologies which are carried out in dept. of the energy plant safety technology in KIMM, especially smart plant equipment, plant inspection/maintenance and safety action.
김명배(Myungbae Kim),최병일(Byungil Choi),한용식(Yongshik Han),도규형(Kyu Hyung Do),김태훈(Tae Hoon Kim),이유환(Yuwhan Lee) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Hazard evaluation and FTA are performed as the first and the second step of QRA for a LNG storage tank. Hazards are identified using HAZOP. Each segment of the system is examined, and we list all possible deviations from normal operating conditions and how they might occur. The consequences on the process are assessed, and the means available to detect and correct the deviations are reviewed. The FTA is carried out to analyse the hazards identified from the HAZOP study. A top event is selected to be release of LNG. Then all combinations of individual failures that can lead to the hazardous event are shown in the logical format of the fault tree system.
김명배(Myungbae Kim),도규형(Kyuhyung Do),한용식(Yongshik Han),최병일(Byungil Choi) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.3
증발하면서 원형으로 퍼져가고 있는 액체에 대한 모델을 지배하는 연립 상미분 방정식은 지금까지 수치해석적인 방법으로 풀어 왔는데 본 연구에서 섭동해를 최초로 구하였다. 액체의 순간적인 누출과 연속적인 누출에 대하여 섭동 변수로써 단위면적 당 증발률을 사용하여 1차항까지 섭동해를 구하였다. 1차 섭동해의 계산 결과 풀의 부피에 대하여 초기에는 수치해와 잘 일치 하였으나 후기에는 약간의 차이가 존재하였으며 풀의 반경에 대하여는 두가지 종류의 해가 거의 일치 하였다. We solve the simple physical model for liquid pool spreading with vaporization semi-analytically for the first time, using perturbation techniques. The results are compared with those obtained using numerical methods. We use the evaporation rate per unit area as a perturbation parameter, and first-order solutions are obtained for continuous and instantaneous release. The two solutions are nearly identical with respect to the pool radius. The pool volumes are nearly the same at the early stage of the spread and then start to diverge.
김명배(Myungbae Kim),도규형(Kyuhyung Do),최병일(Byungil Choi),한용식(Yongshik Han),이유환(Yuwhan Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In the present work the second-order perturbation solutions of the simple physical model for liquid pool spreading are obtained for the case of continuous spill. To generalize the solution governing equations are non-dimensionalized and major dimensionless variables are identified. The second-order solutions improve the first-order solution for the pool volume.
유화롱(HWALONG YOU),최병일(BYUNGIL CHOI),도규형(KYUHYUNG DO),김태훈(TAEHOON KIM),김창현(CHANGHYUN KIM),김민창(MINCHANG KIM),한용식(YONGSHIK HAN) 한국수소및신에너지학회 2023 한국수소 및 신에너지학회논문집 Vol.34 No.6
This study analyzes the cool-down process of liquid hydrogen storage tanks, which have advantages in terms of large-capacity transfer, storage, and utilization as hydrogen demand increases. A hydrogen liquefaction plant is selected for analysis and an efficient tank cooling method is sought by comparing the time required for the cool-down process with the gas consumption in connection with the gassing-up process required for the operation of the liquid hydrogen storage tank. The results of this study can be referred to in the operation process after the initial start-up and maintenance of the hydrogen liquefaction plant.