Numerical and experimental investigation of pressure drop characteristics during upward boiling two-phase flow of nitrogen
Numerical and experimental investigation of pressure drop characteristics during upward boiling two-phase flow of nitrogen
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DOI：
10.1016/j.ijheatmasstransfer.2006.09.036
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发表时间：
2007-05
影响因子：
5.2
通讯作者：
Xiang-dong Li;Rongshun Wang;Rongguo Huang;Yu-mei Shi
中科院分区：
文献类型：
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作者：
Xiang-dong Li;Rongshun Wang;Rongguo Huang;Yu-mei Shi
利用内径为6.0mm的垂直管内实验研究了恒定质量通量和变热流密度下氮气向上沸腾两相流的总压降特性，并采用具有新闭合关联的双流体模型进行了数值模拟。数值计算结果与实验数据的对比表明，在压降演化曲线的过渡点之前，预测的压降与实验数据吻合较好。研究表明，壁面润滑力模型和气泡直径模型对压降预测均有显著影响。理论分析和实验证据表明，压降演化曲线上的过渡点反映了气泡向段塞流型的转变。
The characteristics of overall pressure drop during upward boiling two-phase flow of nitrogen with constant mass flux and varying heat flux are experimentally investigated using a vertical tube with an inner diameter of 6.0mm and numerically simulated using the two-fluid model with new closure correlations. Comparison of the numerical results against the experimental data shows that prior to the transition point in the curve of pressure drop evolution, the predicted pressure drop is in a satisfactory agreement with the experimental data. The present study demonstrates that both the wall lubrication force modeling and the bubble diameter modeling have significant effect on the pressure drop prediction. Both the theoretical analysis and the experimental evidence suggest that the transition point in the pressure drop evolution curve reflects the bubbly-to-slug flow regime transition.