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A mechanistic model of heat transfer for gas–liquid flow in vertical wellbore annuli

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Petroleum Science 2018年第1期15卷 135-145页

作者： Bang-Tang Yin Xiang-Fang Li Gang Liu School of Petroleum Engineering China University of Petroleum (East China) College of Petroleum Engineering China University of PetroleumBeijing

The most prominent aspect of multiphase flow is the variation in the physical distribution of the phases in the flow conduit known as the flow pattern. Several different flow patterns can exist under different flow conditions which have significant effects on liquid holdup, pressure gradient and heat transfer. gas-liquid two-phase flow in an annulus can be found in a variety of practical situations. In high rate oil and gas production, it may be beneficial to flow fluids vertically through the annulus configuration between well tubing and casing. The flow patterns in annuli are different from pipe flow. There are both casing and tubing liquid films in slug flow and annular flow in the annulus. Multiphase heat transfer depends on the hydrodynamic behavior of the flow. There are very limited research results that can be found in the open literature for multiphase heat transfer in wellbore annuli. A mechanistic model of multiphase heat transfer is developed for different flow patterns of upward gas-liquid flow in vertical annuli. The required local flow parameters are predicted by use of the hydraulic model of steady-state multiphase flow in wellbore annuli recently developed by Yin et al. The modified heat-transfer model for single gas or liquid flow is verified by comparison with Manabe＇s experimental results. For different flow patterns, it is compared with modified unified Zhang et al. model based on representative diameters.

关键词： gas-liquid flow Vertical annuli Heattransfer Tubing liquid film Casing liquid film

Numerical Simulation of gas-liquid flow in a Stirred Tank with a Rushton Impeller

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Chinese Journal of Chemical Engineering 2002年第4期10卷 385-395页

作者：王卫京毛在砂 Institute of Process Engineering Chinese Academy of Sciences 北京 100080

The gas-liquid flow field in a stirred tank with a Rushton diskturbine, including the impeller region, was numerically simulatedusing the improved inner-outer iterative procedure. Thecharacteristic features of the stirred tank, such as gas cavity andaccumulation of gas at the two sides of wall baffles, can be capturedby the simulation. The simulated results agree well with availableexperimental data. Since the improved inner-outer iterative algorithmdemands on empirical formula and experimental data for the impellerregion, and the approach seems generally applicable for simulatinggas-liquid stirred tanks.

关键词： stirred tank gas-liquid flow Rushton impeller inner-outer iteration

A PHYSICAL MODEL FOR PREDICTING THE PRESSURE DROP OF gas-liquid SLUG flow IN HORIZONTAL PIPES

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Journal of Hydrodynamics 2007年第6期19卷 736-742页

作者： LI Guo-zhen YAO Yue-dong DONG Shou-ping Faculty of Mechanical and Electronic Engineering China University of Petroleum （Beijing） Beijing 102249 China CMOE Key Laboratory of Petroleum Engineering China University of Petroleum （Beijing） Beijing 102249China Faculty of Mechanical and Electronic Engineering China University of Petroleum （Beijing） Beijing 102249China

A comprehensive treatment of all sources of pressure drop within intermittent gas-liquid flow is presented. A slug unit is divided into three parts and the pressure gradient of each part is calculated separately. In the mixing zone the momentum theory is employed and the mixing process between the film and slug is simulated by a two-dimensional wall jet entering a large reservoir to calculate the mixing length. The boundary layer theory is utilized to calculate the pressure drop for the slug body and the momentum equation of the film zone is integrated to calculate the pressure drop for the film zone. The pressure drop predicted in present model is in good agreement with all the measurements.

关键词： slug flow gas-liquid flow pressure drop,physical model

Classification of flow regimes in gas-liquid horizontal Couette-Taylor flow using dimensionless criteria

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Journal of Hydrodynamics 2015年第5期27卷 773-781页

作者： HUBACZ Robert Faculty of Chemical and Process Engineering Warsaw University of Technology

In this paper, the flow patterns observed in horizontal Couette-Taylor flow（CTF） were correlated using dimensionless numbers. The analysis of the results showed that the structure of the flow was an outcome of interaction between fluid inertia related to axial and rotational flows and gravitation. Therefore, the flow structures were correlated using axial and angular Reynolds numbers, and Archimedes number for the given value of gas-to-liquid flow ratio. Finally, the correlation for the prediction of the transition to the flow regime observed at high rotational speeds was proposed. The comparison with experiments carried out in the vertical CTF from the literature showed that this correlation can also be useful in the case of vertical flow.

关键词： gas-liquid flow Couette-Taylor flow(CTF) flow regime maps

gas–liquid two-phase flow in serpentine microchannel with different wall wettability

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Chinese Journal of Chemical Engineering 2017年第7期25卷 874-881页

作者： Yunlong Zhou He Chang Tianyu Qi Energy and Power Engineering College Northeast Dianli University Institute of Energy Environment and Economy Tsinghua University

gas–liquid flow in serpentine microchannel with different surface properties exhibits drastically different flow behavior. With water and air as working fluids, the method of numerical simulation was adopted in this paper based on CLSVOF(coupled level set and volume of fluid method) multiphase model. After verifying the reasonability of the model through experiment, by changing wall properties and Re number(Reflow regime and Po number were discussed. Moreover, the difference of pressure drop between curve and straight microchannel was also calculated. Beyond that, the combined effect of curve channel and wall properties on flow resistance was analyzed. This paper finds that wall properties have great influence on gas–liquid flow in microchannels not only on flow regime but also flow characteristics. Meanwhile, the pressure drop in curve microchannels is larger than straight. It is more beneficial for fluid flowing when the straight part of microchannel is hydrophilic smooth wall and curve part is hydrophobic with large roughness.

关键词： Serpentine microchannel Computational fluid dynamics gas-liquid flow Microfluidics

Mass transfer intensification and mechanism analysis of gas–liquid two-phase flow in the microchannel embedding triangular obstacles

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Chinese Journal of Chemical Engineering 2022年第11期51卷 100-108页

作者： Xuanyu Nie Chunying Zhu Taotao Fu Youguang Ma State Key Laboratory of Chemical Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

An effective mass transfer intensification method was proposed by embedding different triangular obstacles to improve the gas-liquid mass transfer efficiency in *** influences of triangle obstacles configuration,obstacle interval and flow rate on the volumetric mass transfer coefficient,pressure drop and energy consumption were investigated *** enhancement factor was used to quantify the mass transfer enhancement effect of triangle *** was found that the isosceles or equilateral triangle obstacles are superior to the rectangular *** maximum enhancement factor of equilateral triangle obstacles was *** comprehensively mass transfer enhancement and energy consumption,the isosceles triangle obstacle showed the best performance,its maximum enhancement factor was 2.1,while the maximum pressure drop increased only 0.41 kPa(22%)compared to the microchannel without ***,a micro-particle image velocimetry(micro-PIV)was utilized to observe the flow field distribution and evolution,in order to understand and analyze the enhancement *** micro-PIV measurement indicated that the obstacle structure could induce the formation of vortex,which promotes convective mass transfer and thins the flow boundary layer,accordingly,the gas-liquid mass transfer efficiency is remarkably *** study can provide theoretical guidance and support for the design and optimization of microchannel with triangular obstacles.

关键词： Enhancement factor Microchannels gas-liquid flow Mass transfer Triangular obstacle

A novel complex network-based deep learning method for characterizing gas-liquid two-phase flow

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Petroleum Science 2021年第1期18卷 259-268页

作者： Zhong-Ke Gao Ming-Xu Liu Wei-Dong Dang Qing Cai School of Electrical and Information Engineering Tianjin UniversityTianjin 300072TianjinChina

gas-liquid two-phase flow widely exits in production and transportation of petroleum *** gas-liquid flow and measuring flow parameters represent challenges of great importance,which contribute to the recognition of flow regime and the optimal design of industrial *** this paper,we propose a novel complex network-based deep learning method for characterizing gas-liquid ***,we map the multichannel measurements to multiple limited penetrable visibility graphs(LPVGs)and obtain their degree sequences as the graph *** on the degree distribution,we analyze the complicated flow behavior under different flow ***,we design a dual-input convolutional neural network to fuse the raw signals and the graph representation of LPVGs for the classification of flow structures and measurement of gas void *** implement the model with two parallel branches with the same structure,each corresponding to one *** branch consists of a channel-projection convolutional part,a spatial-temporal convolutional part,a dense block and an attention *** outputs of the two branches are concatenated and fed into several full connected layers for the classification and *** last,our method achieves an accuracy of 95.3%for the classification of flow structures,and a mean squared error of 0.0038 and a mean absolute percent error of 6.3%for the measurement of gas void *** method provides a promising solution for characterizing gas-liquid flow and measuring flow parameters.

关键词： gas-liquid flow gas void fraction flow structure Limited penetrable visibility graph Deep learning

Effect of the Inclination Angle on Slippage Loss in gas-liquid Two-Phase flow

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Fluid Dynamics & Materials Processing 2020年第3期16卷 475-488页

作者： Yushan Liu Yubin Su Zhenhua Wu Wei Luo Ruiquan Liao School of Petroleum Engineering Yangtze UniversityWuhan430100China Laboratory of Multiphase Pipe flow of gas Lift Innovation Center CNPC(Yangtze University)Wuhan430100China Oil&gas Technology Research Institute Changqing Oilfield Branch CompanyPetroChinaXi’an710021China Research and Development Center Tuha Oilfield CompanyTulufan838202China

The lifting efficiency and stability of gas lift well are affected by the socalled slippage-loss effect in gas-liquid two-phase *** existing studies on this subject have generally been based on vertical and horizontal *** a few of them have considered inclined *** the present work a new focused study is presented along these *** specifically,we use the non-slip pressure drop model with Flanigan’s fluctuation correction coefficient formula(together with the parameters of slippage density,slippage pressure drop and slippage ratio)to analyze the influence of the inclination angle on slippage loss for different conditions(different gas-liquid superficial velocity and pipe diameters).Moreover,the“standard regression coefficient method”is used for multi-factor sensitivity *** experimental results indicate that slippage loss is affected by multiple factors,and the influence of the inclination angle on slippage loss is less significant than other *** change of the slippage pressure drop with the superficial velocity of gas-liquid is similar to that of the total pressure *** inclination angles of 45°and 60°have the greatest influence on slippage *** correlation between slippage density and slippage ratio is not *** the so-called slippage ratio seems to be a more accurate option to evaluate the degree of slippage loss.

关键词： Inclined pipes gas-liquid flow slippage loss pressure drop gas-liquid ratio

A Hydrodynamic Modei for Slug Frequency in Horizontal gas-liquid Two-Phase flow

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Chinese Journal of Chemical Engineering 2003年第5期11卷 508-514页

作者：刘磊孙贺东胡志华周芳德 State Key Laboratory of Multiphase flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

The prediction of slug frequency has important significance on gas-liquid two-phase flow. A hydrody-namic modei was put forward to evaluate slug frequency for horizontal two-phase flow, based on the dependence of slug frequency on the frequency of unstable interfacial wave. Using air and water, experimental verification of the modei was carried out in a large range of flow parameters. Six electrical probes were installed at different positions of a horizontal plexiglass pipe to detect slug frequency development. The pipe is 30m long and its inner diameter is 24 mm. It is observed experimentally that the interfacial wave frequency at the inlet is about l to 3 times the frequency of stable slug. The slug frequencies predicted by the modei fit well with Tronconi (1990) modei and the experimental data. The combination of the hydrodynamic modei and the experimental data results in a conclusion that the frequency of equilibrium liquid slug is approximately half the miniraum frequency of interfacial wave.

关键词： gas-liquid flow two-phase flow interfacial wave hydrodynamic model slug frequency