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Analysis of pressure fluctuations for oil-gas two-phase flow in a horizontal pipe using the bubble number density equation
Chemical Engineering Communications ( IF 2.5 ) Pub Date : 2021-04-02 , DOI: 10.1080/00986445.2020.1869950
Yongjiang Li 1 , Zhiyi Yu 1 , Qing Ye 1 , Jianxin Yang 1 , Shazia Hayat 2
Affiliation  

Abstract

Visualization experiments and numerical simulations of two-phase flow are conducted to study the pressure fluctuation characteristics of oil-gas flow in horizontal pipes. The two-fluid model based on the Eulerian–Eulerian method is adopted, and the bubble number density equation (BNDE) is introduced to the simulation to predict the bubble size and distribution within the pipe. The bubble size and pressure variations in the pipe obtained from the simulations agree well with the recorded values from the experiments. The fast Fourier transform (FFT) algorithm is used to analyze the characteristics of pressure fluctuations, and the results show that the sudden pressure increase in the pipe sections is related to gas injection. The bubble number density increases with liquid flow rate (Ql), which causes the oil-gas flow to be more turbulent while increasing the amplitude of high-frequency fluctuations. The maximum amplitude for the dominant frequency is observed near the pump inlet for low liquid flow rates. At high liquid flow rates, more liquid vortices are found near the gas orifice, and there is a maximum amplitude for the dominant frequency in this section. Due to the high swirling strength at larger inlet gas volume fraction (IGVF), there is an obvious increase in the amplitude of low-frequency fluctuations, while the amplitude of high-frequency fluctuations is nearly the same under all IGVF.



中文翻译:

基于气泡数密度方程的水平管道油气两相流压力波动分析

摘要

通过两相流的可视化实验和数值模拟,研究了水平管内油气流动的压力波动特性。采用基于欧拉-欧拉方法的二流体模型,并在模拟中引入气泡数密度方程(BNDE)来预测管道内气泡的大小和分布。从模拟中获得的管道中的气泡大小和压力变化与实验记录的值非常吻合。采用快速傅里叶变换(FFT)算法分析压力波动特征,结果表明管段压力突然升高与注气有关。气泡数密度随液体流速(Q l),这导致油气流动更加湍流,同时增加了高频波动的幅度。对于低液体流速,在泵入口附近观察到主频率的最大幅度。在高液体流速下,在气体孔口附近发现更多的液体涡流,并且该部分的主频率存在最大幅度。由于入口气体体积分数(IGVF)较大时涡流强度高,低频波动幅度明显增加,而高频波动幅度在所有IGVF下几乎相同。

更新日期:2021-04-02
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