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首页> 外文期刊>International Journal of Heat and Mass Transfer >Volumetric interfacial area prediction in upward bubbly two-phase flow
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Volumetric interfacial area prediction in upward bubbly two-phase flow

机译：气泡状两相向上流动的体积界面面积预测

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摘要

In two-phase flow studies, a volumetric interfacial area balance equation is often used in addition to the multidimensional two-fluid model to describe the geometrical structure of the two-phase flow. In the particular case of bubbly flows, numerous works have been done by different authors on the subject. Our work concerns two main modifications of this balance equation: (1) new time scales are proposed for turbulence induced coalescence and breakup, (2) modeling of the nucleation of new bubbles on the volumetric interfacial area. The 3D module of the CATHARE code is used to evaluate our new model, in comparison to three other models for interfacial area found in the literature, on two different experiments. First, we use the DEBORA experimental data base for the comparison in the case of boiling bubbly flow. The comparison of the different volumetric interfacial area models to the DEBORA experimental data shows that even though the theoretical values of the coefficients are adopted in our modified model, this model has a quite good capability to predict the local two-phase geometrical parameters in the boiling flow conditions. Secondly, we compare the predictions obtained with the same models to the DEDALE experimental data base, for the case of adiabatic bubbly flow. In comparison to the other models tested, our model also gives quite good predictions of the bubble diameter in the case of adiabatic conditions.
机译：在两相流研究中，除多维两流体模型外，还经常使用体积界面面积平衡方程来描述两相流的几何结构。在特定的气泡流动情况下，不同作者针对该主题进行了许多工作。我们的工作涉及此平衡方程的两个主要修改：（1）为湍流引起的聚结和破裂提出了新的时间尺度；（2）在体积界面区域上对新气泡成核的建模。与文献中发现的其他三个界面区域模型相比，在两个不同的实验上，CATHARE代码的3D模块用于评估我们的新模型。首先，我们使用DEBORA实验数据库进行沸腾沸腾流的比较。不同体积界面面积模型与DEBORA实验数据的比较表明，即使在我们的改进模型中采用了系数的理论值，该模型也具有很好的预测沸腾过程中局部两相几何参数的能力流动条件。其次，对于绝热气泡流，我们将使用相同模型获得的预测与DEDALE实验数据库进行比较。与测试的其他模型相比，我们的模型在绝热条件下也能很好地预测气泡直径。

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