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Numerical Model of Heat Diffusion and Evaporation by LNG Leakage at Membrane Insulation
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 Title & Authors
Numerical Model of Heat Diffusion and Evaporation by LNG Leakage at Membrane Insulation
Lee, Jang Hyun; Kim, YoonJo; Hwang, Se Yun;
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The leakage of cryogenic LNG through cracks in the insulation membrane of an LNG carrier causes the hull structure to experience a cold spot as a result of the heat transfer from the LNG. The hull structure will become brittle at this cold spot and the evaporated natural gas may potentially lead to a hazard because of its flammability. This paper presents a computational model for the LNG flow and heat diffusion in an LNG insulation panel subject to leakage. The temperature distribution in the insulation panel and the speed of gas diffusion through it are simulated to assess the safety level of an LNG carrier subject that experiences a leak. The behavior of the leaked LNG is modeled using a multiphase flow that considers the mixture of liquid and gas. The simulation model considers the phase change of the LNG, gas-liquid multiphase interactions in the porous media, and accompanying rates of heat transfer. It is assumed that the NO96-GW membrane storage is composed of glass wool and plywood for the numerical simulation. In the numerical simulation, the seepage, heat diffusion, and evaporation of the LNG are investigated. It is found that the diffusion speed of the leakage is very high to accelerate the evaporation of the LNG.
Two-phase/Multiphase flow;Porous media;LNG leakage;BOR (boil-off-ratio);LNG cargo containment;Evaporation;
 Cited by
상용 보호열판법 열전도율 측정장비를 사용한 열유속법의 열전도율 값 보정에 대한 실험적 연구,이진성;김경수;김유일;우석민;윤승진;

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