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首页> 外文期刊>International Journal of Heat and Mass Transfer >Drift-flux correlation for upward gas-liquid two-phase flow in vertical rod bundle flow channel
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Drift-flux correlation for upward gas-liquid two-phase flow in vertical rod bundle flow channel

机译：垂直杆束流动通道向上气液两相流的漂移通量相关性

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摘要

This paper has reviewed 17 available drift-flux correlations and collected 959 existing void fraction experimental data for air-water and steam-water two-phase flows in the vertical rod bundle flow channels. The performances of these drift-flux correlations have been evaluated with the collected experimental data. The evaluations conclude that the recently-developed drift-flux correlation of Schlegel and Hibiki gives the best predictions, and the drift-flux correlations of Clark et al. and Ye et al. can provide reasonable predictions for the collected experimental data. However, these drift-flux correlation series of Clark et al., Ye et al. and Schlegel and Hibiki are found to have the following three shortcomings. (1) Their distribution parameter correlation has ignored the flow regime and bubble behavior effects due to the different combinations of the non-dimensional superficial gas and liquid velocities at the same non-dimensional mixture volumetric flux under the high non-dimensional mixture volumetric flux conditions. (2) Their distribution parameter correlation has used the non-dimensional superficial gas and liquid velocities which cannot effectively reflect the pressure effect on the distribution parameter. (3) Their drift velocity correlation has ignored the drift velocity difference due to the flow regime transitions and has used the bubbly flow drift velocity correlation for all flow regimes, including the cap-bubbly, churn and annular flows. In view of these shortcomings, the present drift-flux correlation development adopts the segmented drift velocity correlations considering the features of bubbly, cap-bubbly, churn and annular flows in vertical rod bundle flow channel. The analysis for the experimental data of the asymptotic distribution parameter has shown that the asymptotic distribution parameter depends on the gas-phase Reynolds number with a feature that it linearly increases with gas-phase Reynolds number in the low gas-phase Reynolds number region, peaks at a critical gas-phase Reynolds number and exponentially decreases in the high gas-phase Reynolds number region under a certain liquid-phase Reynolds number flow conditions. This phenomenon is found to be caused by the formation and breakup processes of large-cap bubbles and their resultant intensive secondary flows corresponding to the flow regime transitions in the vertical rod bundle flow channel. So, a new distribution parameter correlation has been developed based on the gas-and liquid-phase Reynolds numbers reflecting the ratio of each phase inertial force to viscous force for the two-phase flows in vertical rod bundle flow channel. The newly-developed drift-flux correlation has been checked against various experimental data of air-water and steam-water two-phase flows in the rod bundle flow channel and a good agreement has been reached.
机译：本文综述了17种可用的漂移通量相关性，并收集了垂直杆束流动通道中的空气水和蒸汽水两相流量的959个现有的空隙分数实验数据。已经通过收集的实验数据评估了这些漂移通量相关性的性能。评估得出结论，Schlegel和Hibiki最近开发的漂移通量相关性提供了克拉卡等人的最佳预测和漂移通量相关性。和你等。可以为收集的实验数据提供合理的预测。但是，这些曲线等漂移通量相关系列，叶等。和Schlegel和Hibiki发现有以下三个缺点。 （1）它们的分布参数相关性忽略了由于在高非尺寸混合物体积磁通条件下的非尺寸浅表体积体积和液体速度的不同组合而导致的流动制度和气泡行为效应。 （2）它们的分布参数相关性使用不尺寸表面气体和液体速度，其无法有效地反映对分布参数的压力影响。 （3）它们的漂移速度相关性忽略了由于流动调节器的漂移速度差异，并且使用了所有流动制度的气泡流漂移速度相关，包括帽子气泡，搅拌和环形流动。鉴于这些缺点，本漂移通量相关性发展考虑垂直杆束流动通道中的起泡，帽子，搅拌，搅拌和环形流动的特征，采用分段漂移速度相关性。渐近分布参数的实验数据的分析表明，渐近分布参数取决于气相雷诺数，其特征在于它在低气相雷诺数，峰值中与气相雷诺数线性增加。在一定的液相雷诺数流动条件下，在关键气相雷诺数和高气相雷诺数区域中的呈指数上降低。发现这种现象是由大帽气泡的形成和分离过程和与垂直杆束流动通道中的流动调节相对应的所得的强化二次流动引起的。因此，基于反映每个相惯性力与垂直杆束流动通道中的两相流量的每个相惯性力与粘性力的比率的气体和液相雷诺数进行了新的分布参数相关性。已经检查了新开发的漂移通量相关性，针对杆束流动通道中的空气水和蒸汽水两相流动的各种实验数据检查，达到了良好的一致性。

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