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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Evaluating the two-phase flow development through orifices using a synchronised multi-channel void fraction sensor
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Evaluating the two-phase flow development through orifices using a synchronised multi-channel void fraction sensor

机译：使用同步多通道空隙分数传感器评估通过孔口的两相流动开发

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摘要

Understating two-phase flow through flow restricting orifices is critical in evaluating the piping degradation mechanisms in nuclear power generation systems. Characterizing the instantaneous changes of the two-phase local parameters across flow restricting orifices is critical in evaluating the piping structure dynamics. A multi-channel void fraction sensor was developed to investigate the effect of flow restricting orifices on flow pattern development in a 25.4 mm horizontal pipe. Instantaneous void fraction measurements were obtained at multiple locations upstream and downstream of the flow restricting orifices with area ratios of 0.062, 0.14, 0.25, and 0.56. Additionally, pressure measurements and flow visualizations were carried out to investigate the dynamics flow characteristics through the orifice. A liquid superficial velocity of 0.526, and 1.08 m/s and a gas superficial velocity ranging from 0.164 to 2.795 m/s were selected to represent the intermittent flow pattern. The results revealed that as the gas superficial velocity increased, the flow pattern downstream of the restriction changed to dispersed bubbly, or liquid jet and annular-dispersed liquid for an intermittent flow upstream of the orifice. The flow pattern development along the test section was affected significantly in the region close to the orifice, especially at a lower area ratio. Analysis of statistical characteristics of the slug flow pattern such as slug velocity, elongated bubble length and slug frequency were determined from the void fraction data and presented. The slug velocity upstream of the orifice decreased non-linearly as the area of the flow restriction decreased for the same flow condition upstream. The pressure variations along the pipe for different two-phase flow conditions across the orifices were obtained and different correlations to predict pressure drop across the orifices were evaluated. The Simpson et al. [1] correlation was the best as it predicted 93% of the experimental data with a 25% error.
机译：通过流动限制孔口低估两相流程对于评估核发生发电系统中的管道退化机制至关重要。在评估管道结构动态的情况下，对流量限制孔口的两相局部参数的瞬时变化表征是至关重要的。开发了一种多通道空隙率传感器，以研究流动限制孔对25.4 mm水平管中的流动模式开发的影响。在流量限制孔的多个位置处获得瞬时空隙率测量测量，该区域比为0.062,0.14,0.25和0.56的面积比。另外，进行了压力测量和流动可视化，以研究通过孔口的动态流动特性。选择0.526和1.08m / s的液态速度和1.08 m / s的气体表面速度范围为0.164至2.795 m / s以表示间歇流动模式。结果表明，随着气体表面速度增加，限制下游的流动模式改变为分散的气泡，或用于孔口上游的间歇流的液体射流和环形分散的液体。沿着测试部分的流动模式显着在靠近孔口的区域中显着影响，特别是在较低的区域比下。从空隙级分数据确定诸如SLUP速度，细长气泡长度和块频率的突出流动图案的统计特征分析。当流动限制的面积上游时，孔口上游的狭速下降不线性地减小，因为在上游的相同的流动条件下降。获得沿着孔的不同两相流动条件的管道的压力变化，并评估与预测孔口的压降不同的相关性。 SIMPSON等人。 [1]相关性是最好的，因为它预测了93％的实验数据，误差25％。

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