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Characterizations of gas-liquid interface distribution and slug evolution in a vertical pipe

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Petroleum Science 2023年第5期20卷 3157-3171页

作者： Hai-Yang Yu Qiang Xu Ye-Qi Cao Bo Huang Han-Xuan Wang Lie-Jin Guo State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi’an710049ShaanxiChina

Large vertical pipes are key structures connecting subsea wells to offshore ***,existing studies mainly focus on small vertical *** a vertical acrylic pipe with 80 mm inner diameter and 11 m height,a high-speed camera was used to visually research the influences of pipe diameters,liquid properties and inlet effect on air-water co-flow *** flow regime maps of vertical pipes(diameters are in the range of 50e189 mm)were compared and the critical gas velocity of the transition boundary from bubble to slug flow tended to increase with the increase of diameters at D≥80 ***-flux models were established in different flow regimes and liquid properties have a significant effect on drift coefficients of bubble flow and slug flow(void fraction a≤0.4).The influence of inlet turbulent effect on the gas-liquid interface distribution gradually weakened and disappeared from the pipe base to 85D,where the flow was fully *** frequency has a trend of increase first and then decrease with the gas Weber numbers increasing at low liquid superficial velocities(J_(L)≤0.31 m/s).And on the basis of this law,a new slug frequency correlation was *** was found that there was an exponential relationship between the ratio of lengths of Taylor bubble to slug and the void fraction.

关键词： Void fraction Flow regime Drift coefficien slug frequency Taylor bubble length

Numerical study on two-phase flow in horizontal pipe

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排灌机械工程学报 2021年第4期39卷 379-385,425页

作者： WU Yuting XU Kewei KIM Hyoungbum School of Mechanical and Aerospace Engineering Gyeongsang National UniversityJinju 52828S.Korea Research Center for Aircraft Parts Technology Gyeongsang National UniversityJinju 52828S.Korea

Two-phase flow in a horizontal pipe was investigated by using numerical and experimental visualization methods.A horizontal pipe was built for qualitative and quantitative flow *** length of horizontal pipe flow system was 9.5 m and the inner diameter was 51 ***-speed video method was used for the qualitative visualization and PIV method was applied for the quantitative *** same geometry model was used for the numerical *** flow regimes including stratified flow,elongated bubble and slug flow field were generated and visualized by using numerical and experimental *** results show that the numerical simulation results are qualitatively si-milar to that of the experimental *** addition,more quantitative results can be analyzed by numerical *** and decay process of slug flow was investigated,showing that the decay of slug heavily depends on the magnitude of nose velocity and its lasting *** can also be found that the liquid superficial velocity plays a significant role in affecting the slug *** keeping the gas superficial velocity constant,the frequency will increase with the liquid superficial velocity.

关键词： two-phase flow CFD PIV slug flow slug frequency

Experimental Investigation of slug Development on Horizontal Two-phase Flow

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Chinese Journal of Chemical Engineering 2008年第2期16卷 171-177页

作者：顾汉洋郭烈锦 State Key Laboratory of Multiphase Flow Xi＇an Jiaotong University Xi＇an 710049 China School of Nuclear Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

slug initiation and subsequem evolution along a 5.0 cm ID, 16m long horizomal pipe are experimentally studied. The transient characteristics of interfacial structures are described by using simultaneous measuremeres of the liquid height at multiple locations along the pipe. Various effects of superficial gas and liquid velocities and pressure oscillation on the slug initiation and evolution along the pipe are illustrated. It is found that the slug is initiated by a deterministic orocess with reolenishmem and deoletion of liquid near the inlet for the superficial gas velocity USG〈3.0m·s^-1 and by a stochastic process with wave coalescence along the pipe for USG〉3.0m·s^-*** evolution of the slugs is strongly attected by superhclal gas and liquid veloclties for USG〈3.0m·s^-1 but weakly affected by the superficial gas velocity for USG〉3.0 m·s . The suppression of pressure oscillation at the pipe inlet significantly delays the onset of slugging, with slugs forming postponed further downstream. The slug frequency at the outlet is, however, not affected by the variation in the pressure oscillation.

关键词： gas-liquid slug flow slug initiation and evolution slug frequency