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Void Fractions in a Rod Bundle Geometry at High Pressure–Part Ⅰ: Experimental Study
International Journal of Multiphase Flow ( IF 3.8 ) Pub Date : 2020-01-01 , DOI: 10.1016/j.ijmultiphaseflow.2019.103146
Miao Gui , Teng Wang , Zhaohui Liu , Zhiqiang Sui , Qincheng Bi

Abstract An investigation of void fraction measurement and prediction in a triangular-array rod bundle geometry was carried out under high pressure conditions (P = 5–9 MPa and G = 100–350 kg·m−2·s−1). The aims of this work were to expand the existing database and assess and modify the predictive models. The present paper is the Part I of this study, where the experimental work was presented to measure local, chordal and area-average void fractions respectively by a comprehensive measuring system composed by optical probes and gamma-ray densitometry. Non-uniform distribution of void fraction was investigated by local-to-local and local-to-average comparisons of void fractions. The results indicated that non-uniform distribution was not only related to the geometry, but also affected by the transition of flow regimes in rod bundle. The effects of pressure and mass flux on void fractions were also analyzed in detail in consideration of variations of fluid properties and drift-flux parameters. Additionally, both void fraction and interface frequency were compared with the flow regime map in TRACE code. The variation of interface frequency indicated that the droplet entrainment would occur in annular flow at high mass flux. In the Part Ⅱ of this study, an assessment of existing models for void fraction prediction in rod bundles was carried out according to the present data and a newly-developed drift-flux model was proposed.

中文翻译:

高压下棒束几何结构中的空隙分数——第一部分:实验研究

摘要 在高压条件下(P = 5-9 MPa 和 G = 100-350 kg·m-2·s-1)对三角形阵列棒束几何结构中的空隙率测量和预测进行了研究。这项工作的目的是扩展现有数据库并评估和修改预测模型。本论文是本研究的第一部分,其中介绍了通过由光学探头和伽马射线密度计组成的综合测量系统分别测量局部、弦和面积平均空隙率的实验工作。通过空隙率的局部到局部和局部到平均的比较来研究空隙率的非均匀分布。结果表明,非均匀分布不仅与几何形状有关,还受棒束流态转变的影响。考虑到流体性质和漂移通量参数的变化,还详细分析了压力和质量通量对空隙率的影响。此外,空隙率和界面频率都与 TRACE 代码中的流态图进行了比较。界面频率的变化表明,在高质量通量的环形流中会发生液滴夹带。在本研究的第二部分,根据现有数据对现有的棒束孔隙率预测模型进行了评估,并提出了新开发的漂移通量模型。界面频率的变化表明,在高质量通量的环形流中会发生液滴夹带。在本研究的第二部分,根据现有数据对现有的棒束孔隙率预测模型进行了评估,并提出了新开发的漂移通量模型。界面频率的变化表明,在高质量通量的环形流中会发生液滴夹带。在本研究的第二部分,根据现有数据对现有的棒束孔隙率预测模型进行了评估,并提出了新开发的漂移通量模型。
更新日期:2020-01-01
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