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CFD modelling of the isobaric evaporation of cryogenic liquids in storage tanks

机译:贮藏箱中低温液体异常蒸发的CFD建模

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A new CFD model relevant to isobaric cryogen evaporation and weathering in storage tanks has been developed. It treats the heat influx from the surroundings into the vapour and liquid phases separately and allows for heat transfer between the two phases. The model accurately predicts the dynamics of the vapour flow and the vapour to liquid heat transfer. It provides well-resolved velocity and temperature profiles in the vapour phase, as well as evaporation and boil-off gas rates. It demonstrates that the main flow pattern is that the vapour circulates upwards dose to the tank wall, then radially along the roof towards the tank axis, where the flow is partitioned; between a fluid that leaves the tank, and a fluid that recirculates back towards the vapour bulk. The results of simulations, carried out in different sized tanks with different initial amounts of cryogen, were compared with the results of the Huerta and Vesovic non-equilibrium model. The results indicate that, for the purposes of modelling heat transfer between the phases, steady-state vapour temperature and boil-off gas rate, the complex flow established in the vapour phase can be adequately modelled by the effective advective, upward flow from the interface.
机译:已经开发出与储罐中的等差管脱牙和风化相关的新CFD模型。它分别将来自周围环境的热量与蒸汽和液相视为蒸汽和液相,并允许两相之间的热传递。该模型精确地预测蒸汽流动的动态和蒸汽与液体传热。它在气相中提供了良好的速度和温度曲线,以及蒸发和蒸发汽油速率。结果表明,主流模式是蒸汽向向上循环给罐壁,然后沿屋顶朝向罐轴线径向循环,其中流动被隔开;在离开罐的流体之间,以及再循环朝向蒸汽散装的流体。将模拟结果与具有不同初始金属脂肪发生的不同尺寸的坦克,与Huerta和Vesovic非平衡模型的结果进行比较。结果表明,出于在阶段,稳态蒸汽温度和沸腾气体速率之间建模的传热的目的,可以通过从界面的有效方向性的向上流动建立在气相中建立的复杂流动。

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