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배관 결빙 과정에서의 상변화 과정과 자연대류현상의 수치적 해석
정기호(GiHo Jeong),안병진(ByungJin Ahn),최병익(ByungIk Choi),김귀순(KuiSoon Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
A numerical analysis is performed in this study to see the characteristics of the ice plug formation and the heat transfer during pipe freezing process. An unsteady three dimensional computer code which solves incompressible Navier-Stokes equations including energy equation has been developed. The computed results for verification including phase interface and flow patterns showed good agreements with previous results. And additional pipe freezing experiments for verification showed that maximum flow rate for the complete plug formation is highly dependent on the pipe diameter and length of jacket containing refrigerant(LN₂). The results of pipe freezing experiments could be also wed as a guideline and to the proper computation.
우창수(Changsu Woo),김완두(Wandoo Kim),최병익(Byungik Choi),이학주(Hakjoo Lee),이성훈(Seonghoon Lee),조현철(Hyunchul Jo),신외기(Waegi Shin) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The fatigue analysis and lifetime evaluation are very important in design procedure to assure the safety and reliability of the rubber components. Fatigue lifetime prediction methodology of the rubber component was proposed by incorporating the finite element analysis and fatigue damage parameter from fatigue test. Finite element analysis of 3D dumbbell specimen and rubber component were performed based on a hyper-elastic material model determined from material test. The Green-Lagrange strain at the critical location determined from the FEM was used for evaluating the fatigue damaged parameter of the natural rubber. Fatigue life of the rubber component are predicted by using the fatigue damage parameter at the critical location. Predicted fatigue lifes of the rubber component agreed fairly well the experimental fatigue lives.