Modeling of bubble-layer thickness for formulation of one-dimensional interfacial area transport equation in subcooled boiling two-phase flow
Modeling of bubble-layer thickness for formulation of one-dimensional interfacial area transport equation in subcooled boiling two-phase flow
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DOI：
10.1016/s0017-9310(02)00418-0
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发表时间：
2003-04
影响因子：
5.2
通讯作者：
T. Hibiki;R. Situ;Y. Mi;M. Ishii
中科院分区：
文献类型：
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作者：
T. Hibiki;R. Situ;Y. Mi;M. Ishii
在建立过冷沸腾一维界面输运方程的基础上，引入了气泡层厚度模型，避免了过冷沸腾截面平均界面输运方程中的协方差较大的问题。通过将流动区域划分为两个区域：沸腾两相(气泡层)区和液体单相区，建立了过冷沸腾流动的一维界面输运方程。为了预测过冷沸腾流动的气泡层厚度，建立了气泡层厚度模型，该模型假定气泡层区域存在方形空泡峰。通过在内部加热的环空中测量的空泡率分布对得到的模型进行了评估。结果表明，气泡层厚度模型可以用来预测气泡层厚度和空泡率分布。此外，根据测量数据建立了用于建立气泡层厚度模型的内加热环空沸腾流动分布参数的本构方程。本研究建立的模型最终将用于建立可靠的本构关系，以反映过冷沸腾流动中真实的传递机理。
In relation to the formulation of one-dimensional interfacial area transport equation in a subcooled boiling flow, the bubble-layer thickness model was introduced to avoid many covariances in cross-sectional averaged interfacial area transport equation in the subcooled boiling flow. The one-dimensional interfacial area transport equation in the subcooled boiling flow was formulated by partitioning a flow region into two regions; boiling two-phase (bubble-layer) region and liquid single-phase region. The bubble-layer thickness model assuming the square void peak in the bubble-layer region was developed to predict the bubble-layer thickness of the subcooled boiling flow. The obtained model was evaluated by void fraction profile measured in an internally heated annulus. It was shown that the bubble-layer thickness model could be applied to predict the bubble-layer thickness as well as the void fraction profile. In addition, the constitutive equation for the distribution parameter of the boiling flow in the internally heated annulus, which was used for formulating the bubble-layer thickness model, was developed based on the measured data. The model developed in this study will eventually be used for the development of reliable constitutive relations, which reflect the true transfer mechanisms in subcooled boiling flows.