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主页 旧刊 Thermal Letter 有关人员 未来大会 IHTC汇编

ISBN : 978-1-56700-421-2

International Heat Transfer Conference 15
2014, 10-15 August, Kyoto, Japan

Computational Studies of LNG Evaporation and Heat Diffusion through LNG Cargo Tank Membrane

DOI: 10.1615/IHTC15.tpn.009780
pages 8657-8667

摘要

The insulation system in a LNG carrier is designed to minimize the boil-off loss from the cargo maintained at cryogenic temperature. The release of the cryogenic liquid through the cracks in the insulation membrane results in "cold spots" caused by the evaporation of the leaked LNG and the heat transfer within the hull structures. At the cold spot, the materials used for the hull structure will crystalize and become brittle. Also, the loss of LNG containments may lead to a potentially significant hazard because of the flammability and the burring velocity of LNG. The characterization of the temperature distribution along the insulation panel and the heat diffusion speed through the insulation materials are crucial and necessary for the safety of LNG carrier. The prediction of the flow and thermal behaviors of the leaked LNG necessitates complex multiphase flow numerical simulation in various flow regimes. This paper presents the CFD (computational fluid dynamics) simulation of liquid-to-gas evaporation and heat diffusion in the LNG insulation panel. The CFD model considers phase change, gas–liquid reactions in the porous media and the accompanied rates of heat transfer. It also considers the geometry of NO96 membrane storage facilities with glass wool and plywood. In the numerical simulation, the LNG pool spreading, heat diffusion, and the evaporation were investigated.