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Statistical Characterization of Flow Structure of Air–water Two-phase Flow in Airlift Pump–Bubble Generator System
International Journal of Multiphase Flow ( IF 3.8 ) Pub Date : 2021-02-17 , DOI: 10.1016/j.ijmultiphaseflow.2021.103596
IGNB. Catrawedarma , Deendarlianto , Indarto

The aim of this study is to identify the flow structure in an airlift pump–bubble generator system by using experimentally obtained differential pressure signals. Differential pressure measurements were applied at both the bottom and top test sections. The normalized time variation of the differential pressure data was analyzed using the probability density function (PDF), power spectral density function (PSDF), Kolmogorov entropy, and discrete wavelet transform (DWT). The results indicate that the water movement mechanism in the riser pipe could be divided into three regions, namely fixed liquid, locally moving liquid, and fully moving liquid, depending on the supplied superficial air velocity. Moreover, the chaotic in riser pipe increases with the increase of the submergence ratio at high supplied superficial air velocity. The chaotic level at the bottom of the test section was higher than that at the top of the test section at low supplied superficial air velocity. Finally, the observed flow patterns closely conformed to the previous definition and flow pattern maps. The bubbly flow was classified into clustered, homogeneous, and cap bubble regimes. The slug flow regime was classified into bubbly stable slug, bubbly unstable slug, and slug-churn, wherein the frequencies of both the liquid and air slugs increased with an increase in the air superficial velocity and submergence ratio.



中文翻译:

气举泵-气泡发生器系统中气水两相流流动结构的统计表征

这项研究的目的是通过使用实验获得的压差信号来确定气举泵-气泡发生器系统中的流动结构。在底部和顶部测试部分均进行了压差测量。使用概率密度函数(PDF),功率谱密度函数(PSDF),Kolmogorov熵和离散小波变换(DWT)分析了压差数据的标准化时间变化。结果表明,根据所提供的表观空气速度,立管中的水运动机理可分为三个区域,即固定液体,局部移动液体和完全移动液体。而且,在高的表观空气速度下,立管中的混乱随着浸没率的增加而增加。在低表观空气速度下,测试部分底部的混乱程度高于测试部分顶部的混乱程度。最后,观察到的流型与先前的定义和流型图非常吻合。气泡流分为聚类,均质和帽泡形态。团状流态分为气泡稳定团状,气泡不稳定团状和团状搅动,其中液体和空气团状的频率都随着空气表观速度和浸没率的增加而增加。和上限泡沫制度。团状流态分为气泡稳定团状,气泡不稳定团状和团状搅动,其中液体和空气团状的频率都随着空气表观速度和浸没率的增加而增加。和上限泡沫制度。团状流态分为气泡稳定团状,气泡不稳定团状和团状搅动,其中液体和空气团状的频率都随着空气表观速度和浸没率的增加而增加。

更新日期:2021-02-28
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