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首页> 外文期刊>International Journal of Heat and Mass Transfer >Modeling of void fraction covariance in two-phase flows with phase change
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Modeling of void fraction covariance in two-phase flows with phase change

机译：具有相变的两相流中空隙率协方差的建模

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摘要

The void fraction covariance, which accounts for non-uniformity in the void fraction distribution in the one-dimensional two-fluid model, has been shown to be critical for accurate prediction of the area-averaged interfacial drag force. Defined as the ratio of area-averaged square of void fraction to the square of the area-averaged void fraction, the void fraction covariance, which historically has been treated as unity, is analyzed for gas-dispersed flows undergoing phase change. The covariance is shown to be very large in subcooled boiling where the void fraction is highly non-uniform, which highlights the benefit of the bubble layer thickness averaged two-fluid model. In condensing and flashing flow the void fraction covariance is shown to be significant, having a very large impact on the interfacial drag force as the void fraction increases. The void fraction covariance is studied for its impact on the classical area-averaged two-fluid model, bubble-layer averaged two-fluid model, and area-averaged multiple bubble group two-fluid model. A simple set of correlations are proposed for easy implementation into the existing drag equations, and are shown to agree very well with experimental data.
机译：空隙率协方差是一维两流体模型中空隙率分布不均匀的原因，它对于准确预测面积平均界面阻力是至关重要的。将空隙率协方差定义为空隙率的面积平均平方与面积均值的空隙率的平方之比，该空隙率协方差在历史上一直被视为统一的，用于分析发生相变的气体分散流。协方差显示在过冷沸腾中非常大，其中空隙率非常不均匀，这突出了气泡层厚度平均两流体模型的优势。在冷凝流和闪蒸流中，空隙率的协方差很明显，随着空隙率的增加，对界面阻力的影响很大。研究了空隙率协方差对经典面积平均两流体模型，气泡层平均两流体模型和面积平均多气泡组两流体模型的影响。提出了一组简单的相关性，以易于实现到现有的阻力方程中，并显示出与实验数据非常吻合。

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