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An Experimental Study on the flow Characteristics of OilWater Two-Phase flow in Horizontal Straight Pipes

Chinese Journal of Chemical engineering 2003年第5期11卷 491-496页

作者：刘文红郭烈锦吴铁军张西民 State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

The flow patterns and their transitions of oil-water two-phase flow in horizontal pipes were studied. The experiments were conducted in two kinds of horizontal tubes, made of plexiglas pipe and stainless steel pipe with 40 mm ID respectively. No. 46 mechanical oil and tap water were used as working fluids. The superflcial velocity ranges of oil and water were: 0.04-1.2m·s-1 and 0.04-2.2m·s-1, respectively. The flow patterns were identified by visualization and by transient fluctuation signals of differential pressure drop. The flow patterns were defined according to the relative distribution of oil and water phases in the pipes. flow pattern maps were obtained for both pipelines. In addition, semi-theoretical transition criteria for the flow patterns were proposed, and the proposed transitional criteria are in reasonable agreement with available data in liquid-liquid systems.

关键词： oil-water two-phase flow horizontal pipe flow pattern transition criterion

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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

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Liquid mean velocity and turbulence in a horizontal air-water bubbly flow

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Nuclear Science and Techniques 2003年第2期14卷 149-152页

作者： YANG Jian, ZHANG Ming-Yuan, ZHANG Chao-Jie, SU Yu-Liang (The state key Lab of multiphase flow in power engineering, Xi ’an Jiaotong University, Xi ’an 710049) Xi'an Jiaotong University The State Key Lab of Multiphase Flow in Power Engineering Xi'an 710049

The liquid phase turbulent structure of an air-water bubbly horizontal flow in a circular pipe has been investigated experimentally. Three-dimensional measurements were implemented with two "X" type probes oriented in different planes, and local liquid-phase velocities and turbulent stresses were simultaneously obtained. Systematic measurements were conducted covering a range of local void fraction from 0 to 11.7%. The important experiment results and parametric trends are summarized and discussed.

关键词：湍流气泡流液体速度热膜风速测定法

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Maximum Effective Hole Mathematical Modei and Exact Solution for Commingled Reservoir

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Chinese Journal of Chemical engineering 2003年第5期11卷 550-554页

作者：孙贺东刘磊周芳德高承泰 State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Department of Petroleum Engineering Xi'an Petroleum University Xi'an 710065 China

The maximum effective hole-diameter mathematical modei describing the flow of slightly compressible fluid through a commingled reservoir was solved rigorously with consideration of wellbore storage and different skin factors. The exact solutions for wellbore pressure and the production rate obtained from layer j for a well production at a constant rate from a radial drainage area with infinite and constant pressure and no flow outer boundary condition were expressed in terms of ordinary Bessel functions. These solutions were computed numerically by the Crump's numerical inversion method and the behavior of systems was studied as a function of various reservoir parameters. The modei was compared with the real wellbore radii modei. The new modei is numerically stable when the skin factor is positive and negative, but the real wellbore radii modei is numerically stable only when the skin factor is positive.

关键词： well-testing mathematical model effective hole diameter layered reservoir

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Liquid mean velocity and turbulence in a horizontal air-water bubbly flow

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Nuclear Science and Techniques 2003年第2期000卷

作者： YANG Jian ZHANG Ming-Yuan ZHANG Chao-Jie SU Yu-Liang The State Key Lab of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049

关键词： Air-water bubbly flow Hot-film anemometry Liquid velocity Turbulence

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Gas flow in a Stratified Porous Medium with Crossflow

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Journal of Thermal Science 2002年第1期11卷 35-40页

作者： Sun Hedong Gao Chengtai Qian Huanqun Zhou Fangde State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049China Department of Petroleum Engineering Xi’an Petroleum InstituteXi’an 710065China

A new model called semi-permeable wall model is presented for multilayer gas reservoir. The model is used to study the influence of crossflow on pressure transient well tests and other single-phase flow problems. It is suggested here to use this model to approximate the actual multilayer gas reservoir, so that the problem is greatly simplified mathematically. Its differential equation is established here for multilayer gas reservoirs, and is linearized by normalized pseudo pressure and pseudo time. Simulation program is developed by finite-difference method when all layers are perforated. The feature of wellbore pressure and rate is clarified by analyzing the results of numerical simulation.

关键词： multi-layer gas reservoir semi-permeable wall model numerical simulation transient well-test wellbore storage skin factor.

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An Experimental Study of the flowrate Transients in Slug flow

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Chinese Journal of Chemical engineering 2002年第4期10卷 396-403页

作者：何利民郭烈锦陈学俊陈振瑜寇杰 Xi'an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an 710049 石油大学(东营) 东营 257061

An investigation of the characteristics of flowrate transientswithin slug flow was conducted in a large- scale outdoor testingfacility. The test section consisted of a 378 m long, 7.62 cmdiameter stainless steel pipe. Air and water were used as the testfluids. The response to a change of flowrate of either phase or twophases Was measured using a series of pressure transducers anddifferential pressure transducers. An increase or decrease In gasflowrate caused a pressure overshoot above the value at new steadystate or led to a pressure undershoot To form a temporary stratifiedflow.

关键词： slug flow flowrate transient pressure overshoot pressure undershoot

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Experimental Investigations on Boiling Heat Transfer Inside Miniature Circular Tubes Immersed in FC-72

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Journal of Thermal Science 2002年第4期11卷 303-307页

作者： Qincheng Bi Tianshou Zhao Yajun Guo Tingkuan Chen State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an710049China Department of Mechanical Engineering The Hong Kong University of Science&TechnologyHong KongChina School of Environmental and Municipal Administration Engineering Xi’an University of Architecture&TechnologyXi’an710055China

To investigate the size effect on the characteristics of boiling heat transfer, boiling behavior of FC-72 in heated vertical miniature circular tubes immersed in a liquid pool was experimentally studied. Two AISI 304 stainless steel tubes with inner diameters of 1.10 mm and 1.55 mm correspondingly, were heated by swirled Ni-Cr wire heaters and sealed in Lucite blocks by silicon adhesive. Both the top and the bottom ends of the circular test sections were open to the liquid pool. The boiling curves and heat transfer coefficients were obtained experimentally. The boiling behaviors at the outlets of the miniature tubes were also visualized with a digital video camera. Experimental results show that the tube geometry has a significant effect on the boiling characteristics. Vapor blocking at the outlet of the smaller circular tube with a diameter of 1.10 mm caused severe boiling hysteresis phenomena. The CHF decreased with reducing in tube size.

关键词： boiling heat transfer pool boiling FC-72 miniature circular tube.

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A NUMERICAL PRESSURE TRANSIENT MODEL FOR MULTILAYERED GAS RESERVOIRS WITH PSEUDOSTEADY state FORMATION CROSSflow

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Journal of Hydrodynamics 2002年第2期14卷 71-77页

作者： Sun He-dong, Wang Yue-she, Zhou Fang-de state key laboratory of multiphase flow in power engineering, Xi’an Jiaotong University, Xi’an 710049, China Gao Cheng-tai Xi’an Petroleum Institute, Xi’an 710065, China Zhao Hai-hong China Oil and Gas Pipel State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Xi'an Petroleum Institute Xi'an 710065 China China Oil and Gas Pipeline Scientific Research Institute Langfang 065000 China

Reservoir deposition occurs over geologic periods of time. Although reservoirs are assumed to be homogenous for simplicity of analysis, most reservoirs are heterogeneous in nature. Some common forms of hetergeneity are the presence of layers and the presence of different zones of fluids and/or rock in the formation. A modified semi-permeable model for multi-layered gas reservoirs with pseudo-steady state interlayer crossflow was developed. The model accounted for the effect of skin and wellbore storage, considers all layers open to a single well, which flows at constant total rate. This new numerical solution was proved to be computationally very efficient, and it has been validated by comparing the results with those of some simple, well known models in the well testing literature. The effects of the reservoir parameters such as permeability, vertical permeability, skin, wellbore storage on the wellbore response, pressure and layer production rate were investigated. Numerical solutions of the problem for the modified semi-permeable model were used to find the structure of crossflow in typical cases.

关键词： layered reservoir semi-permeable model transient well testing numerical simulation crossflow

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Distribution of void fraction for gas-liquid slug flow in aninclined pipe

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Nuclear Science and Techniques 2001年第2期12卷 143-148页

作者： XIA Guo-Dong1, ZHOU Fang-De2, HU Ming-Sheng2 (1 College of Environmental and Energy engineering, Beijing Polytechnic University, Beijing 100022 2 state key laboratory of multiphase flow in power engineering, Xi’an Jiaotong University, xi’an 710049) College of Environmental and Energy Engineering Beijing Polytechnic University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

In order to investigate the effect of inclination angle on the spatial distribution of phases, experiments on gas-liquid two-phase slug flow in an inclined pipe were carried out by using the optical probe and an EKTAPRO 1000 high speed motion analyzer. It has been demonstrated that the inclination angle and the mixture velocity are important parameters to influence the distribution of void fraction for upward slug flow in the inclined pipe. At high mixture velocity, the gas phase profile is axial symmetry in the cross-section of the pipe. This is similar to that for vertical slug flow. In contrast, most of the gas phase is located near the upper pipe wall at low mixture velocity. By measuring the axial variation of void fraction along the liquid slug, it can be concluded that there is a high void fraction wake region with length of 3～4D in the front of liquid slug. In the fully developed zone of liquid slug, the peak value of the void fraction is near the upper wall.

关键词：气-液二相流斜管相分布

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