期刊文献+
共找到27篇文章
< 1 2 >
每页显示 20 50 100
Fluidized-bed chlorination thermodynamics and kinetics of Kenya natural rutile ore 被引量:3
1
作者 牛丽萍 张廷安 +2 位作者 倪培远 吕国志 欧阳全胜 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第11期3448-3455,共8页
Natural rutile and gaseous chlorine with carbon as reductant were used to prepare titanium tetrachloride. Thermodynamics and kinetics of chlorination of Kenya natural rutile particles in a batch-type fluidized bed wer... Natural rutile and gaseous chlorine with carbon as reductant were used to prepare titanium tetrachloride. Thermodynamics and kinetics of chlorination of Kenya natural rutile particles in a batch-type fluidized bed were studied at 1173-1273 K. Thermodynamic analysis of this system revealed that the equation of producing CO was dominant at high temperatures. Based on the gas-solid multi-phase reaction theory and a two-phase model for the fluidized bed, the mathematical description for the chlorination reaction of rutile was proposed. The reaction parameters and the average concentration of gaseous chlorine in the emulsion phase were estimated. The average concentration of emulsion phase in the range of fluidized bed was calculated as 0.3 mol/m^3. The results showed that the chlorination of natural rutile proceeded principally in the emulsion phase, and the reaction rate was mainly controlled by the surface reaction. 展开更多
关键词 natural rutile THERMODYNAMICS KINETICS gas-solid reaction fluidized bed two-phase model
下载PDF
纳米SiO_2粒子填充聚苯乙烯悬浮体系的动态流变行为
2
作者 林雷 宋义虎 《胶体与聚合物》 2014年第1期3-5,20,共4页
采用经典的溶胶-凝胶(Sol-gel)法合成直径50 nm的二氧化硅(SiO2)粒子,通过"两相"模型对不同粒子体积分数(φ)的二氧化硅/聚苯乙烯(SiO2/PS)悬浮体系动态粘弹行为进行拟合,讨论温度与φ对频率依赖性动态流变的影响。研究发现,... 采用经典的溶胶-凝胶(Sol-gel)法合成直径50 nm的二氧化硅(SiO2)粒子,通过"两相"模型对不同粒子体积分数(φ)的二氧化硅/聚苯乙烯(SiO2/PS)悬浮体系动态粘弹行为进行拟合,讨论温度与φ对频率依赖性动态流变的影响。研究发现,应变放大因子Af和"粒子相"特征模量Rf″(φ)均随φ增加而增大;Af几乎无温度依赖性,Rf″(φ)随温度升高而降低。该现象归因于温度升高加速了由扩散控制的SiO2团聚过程,导致纳米粒子比表面积减小,抑制了粒子网络的形成。研究表明,两相模型可很好地应用于SiO2/PS悬浮体系的动态流变行为。 展开更多
关键词 “两相”模型 二氧化硅/聚苯乙烯悬浮液 动态流变
下载PDF
Characteristics of a Flow Transducer Based on Polarized Charge
3
作者 张朴 孔力 黄心汉 《Journal of Southeast University(English Edition)》 EI CAS 2001年第2期36-40,共5页
In this paper we analyze the characteristics of a flow transducer based on polarized charge. The effects of the charged particles in pneumatic pipeline on the measurement pipe potential are discussed in detail and the... In this paper we analyze the characteristics of a flow transducer based on polarized charge. The effects of the charged particles in pneumatic pipeline on the measurement pipe potential are discussed in detail and the equivalent circuits of the potential measurement are presented. On this bases, the relationships between mass flowrate and the electrical potential are obtained for different time constants of the measurement circuit. A satisfactory model is presented based on the characteristics of gas solid two phase flow. The linearity of the model is verified by the experiment results. The transducer, which is coaxially connected with the transport pipeline, does not disturb the flow state and has the features of ruggedness and durability, it is especially suitable for industry process control. 展开更多
关键词 polarized charge gas solid two phase flow measurement model
下载PDF
Parametric study of gas−liquid two-phase flow field in horizontal stirred tank 被引量:8
4
作者 Zhi-bin CHEN Hong-jie YAN +4 位作者 Ping ZHOU Ping YANG Jie-hui DING Jia LIU Liu LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第6期1806-1817,共12页
Based on Fluent software,the gas−liquid two-phase flow in the horizontal stirred tank was simulated with SST k−ωturbulence model,Eulerian−Eulerian two-fluid model,and multi-reference flame method.The mixing process i... Based on Fluent software,the gas−liquid two-phase flow in the horizontal stirred tank was simulated with SST k−ωturbulence model,Eulerian−Eulerian two-fluid model,and multi-reference flame method.The mixing process in the tank was calculated by tracer method.The results show that increasing the rotating speed or gas flow is conducive to a more uniform distribution of the gas phase and accelerates the mixing of the liquid phase.When the rotating speed exceeds 93 r/min,the relative power demand remains basically constant.The change in the inclination angle of the upper impeller has minimal effect on the gas phase distribution.When the inclination angle is 50°,the relative power demand reaches the maximum.An appropriate increase in the impeller distance from the bottom improves the gas holdup and gas phase distribution but increases the liquid phase mixing time. 展开更多
关键词 horizontal stirred tank gas−liquid two-phase flow Eulerian−Eulerian two-fluid model multiple reference frame method
下载PDF
Three-phase flow of submarine gas hydrate pipe transport 被引量:7
5
作者 李立 徐海良 杨放琼 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第9期3650-3656,共7页
In the hydraulic transporting process of cutter-suction mining natural gas hydrate, when the temperature-pressure equilibrium of gas hydrate is broken, gas hydrates dissociate into gas. As a result, solid-liquid two-p... In the hydraulic transporting process of cutter-suction mining natural gas hydrate, when the temperature-pressure equilibrium of gas hydrate is broken, gas hydrates dissociate into gas. As a result, solid-liquid two-phase flow(hydrate and water) transforms into gas-solid-liquid three-phase flow(methane, hydrate and water) inside the pipeline. The Euler model and CFD-PBM model were used to simulate gas-solid-liquid three-phase flow. Numerical simulation results show that the gas and solid phase gradually accumulate to the center of the pipe. Flow velocity decreases from center to boundary of the pipe along the radial direction. Comparison of numerical simulation results of two models reveals that the flow state simulated by CFD-PBM model is more uniform than that simulated by Euler model, and the main behavior of the bubble is small bubbles coalescence to large one. Comparison of numerical simulation and experimental investigation shows that the values of flow velocity and gas fraction in CFD-PBM model agree with experimental data better than those in Euler model. The proposed PBM model provides a more accurate and effective way to estimate three-phase flow state of transporting gas hydrate within the submarine pipeline. 展开更多
关键词 gas hydrate pipe transport three-phase flow Euler model CFD-PBM model
下载PDF
Numerical Simulation on Ship Bubbly Wake 被引量:2
6
作者 傅慧萍 万鹏程 《Journal of Marine Science and Application》 2011年第4期413-418,共6页
Based on a volume of fluid two-phase model imbedded in the general computational fluid dynamics code FLUENT6.3.26, the viscous flow with free surface around a model-scaled KRISO container ship (KCS) was first numeri... Based on a volume of fluid two-phase model imbedded in the general computational fluid dynamics code FLUENT6.3.26, the viscous flow with free surface around a model-scaled KRISO container ship (KCS) was first numerically simulated. Then with a rigid-lid-free-surface method, the underwater flow field was computed based on the mixture muitiphase model to simulate the bubbly wake around the KCS hull. The realizable k-e two-equation turbulence model and Reynolds stress model were used to analyze the effects of turbulence model on the ship bubbly wake. The air entrainment model, which is relative to the normal velocity gradient of the free surface, and the solving method were verified by the qualitatively reasonable computed results. 展开更多
关键词 multiphase flow ship hull bubbly wake numerical simulation
下载PDF
CFD-DEM simulation of fluid-solid flow of a tapered column separation bed 被引量:4
7
作者 Duan Chenlong Sheng Cheng +2 位作者 Wu Lingling Zhao Yuemin He Jinfeng 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第5期855-859,共5页
Research on recycling waste Printed Circuit Boards(PCB) is at the forefront of preventing environmental pollution and finding ways to recycle resources.The Tapered Column Separation Bed(TCSB) is invented aiming at dis... Research on recycling waste Printed Circuit Boards(PCB) is at the forefront of preventing environmental pollution and finding ways to recycle resources.The Tapered Column Separation Bed(TCSB) is invented aiming at disposing the problem that fine particles of waste printed circuit boards cannot be separated efficiently so as to obtain further insight about the underlying mechanisms and demonstrate the separation feasibility in the tapered column separation bed.In this work,a Computational Fluid Dynamics(CFD) coupled with Discrete Element Method(DEM) model for two-phase flow has been extended to simulate the fluid-solid flow in the tapered column separation bed.Its validity is demonstrated by its successful capturing the key features of particles' flow pattern,velocity,the pressure distribution,the axial position with time and axial force for particles with different densities.Simulation results show that the plastic particles and resin particles become overflow,while copper particles,iron particles and aluminum particles successively become underflow,with a discharge water flow rate of 1 m^3/h,an obliquity of 30°.The simulated results agree reasonably well with the experimental observation.Using this equipment to separate waste PCBs is feasible,theoretically. 展开更多
关键词 Tapered column separation bed Waste printed circuit boards Computational fluid dynamics Discrete element method Fluid-solid flow
下载PDF
CFD Simulation of Flow and Mass Transfer in Structured Packing Distillation Columns 被引量:3
8
作者 陈江波 刘春江 +1 位作者 袁希钢 余国琮 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第3期381-388,共8页
Detailed investigation of flow behavior in structured packing distillation columns is of great importance in accurate prediction of process efficiency and development of more efficient and optimal equipment internals.... Detailed investigation of flow behavior in structured packing distillation columns is of great importance in accurate prediction of process efficiency and development of more efficient and optimal equipment internals. In this study, a three-dimensional two-phase flow model based on VOF method for simulating the hydrodynamics and mass-transfer behavior in a typical representative unit of the structured packing is developed. In the proposed model, the c 2 - ε c model is used for the closure of turbulent mass transfer equation. By solving the proposed model, the velocity distribution, phase fraction profile and concentration field are obtained. Using these data, the total liquid holdup, the wetted area and the separation efficiency [height equivalent to a theoretical plate (HETP)] are estimated. For testing the model validation, the simulated HETPs are compared with our previous experimental data obtained in a 150 mm-diameter column containing Mellapak 350Y operating at the pressures of 0.6-1.8 MPa. The compari-son shows that they are in satisfactory agreement, with an average absolute deviation (AAD) of 25.4%. 展开更多
关键词 structured packing two-phase flow model mass transfer height equivalent to a theoretical plate
下载PDF
Local Flow Regime Transition Criteria of Gas-Liquid Two-phase Flow in Vertical Upward Tube with a Horizontal Rod 被引量:4
9
作者 胡志华 杨燕华 +1 位作者 刘磊 周芳德 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2006年第4期442-449,共8页
The upward multiphase cross flow and heat transfer in the vertical tube may occur in oil production and chemical facilities. In this study, the local flow patterns of an upward gas-water two phase cross flow in a vert... The upward multiphase cross flow and heat transfer in the vertical tube may occur in oil production and chemical facilities. In this study, the local flow patterns of an upward gas-water two phase cross flow in a vertical tube with a horizontal rod have been investigated with an optical probe and the digital high speed video system. The local flow patterns are defined as the bubble, slug, churn and annular flow patterns. Optical probe signals are ana- lyzed in terms of probability density function, and it is proved that the local flow patterns can be recognized by this method. The transition mechanisms between the different flow patterns have been analyzed and the corresponding transitional models are proposed. Finally, local flow pattern maps of the upward gas-water two-phase flow in the vertical tube with a horizontal rod are constructed. 展开更多
关键词 GAS-LIQUID two-phase cross flow local flow pattern transition
下载PDF
Effective Two-State Model and NOON States for Double-Well Bose-Einstein Condensates in Strong-Interaction Regime 被引量:1
10
作者 YANG Xiao-Xue WU Ying 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第8期244-246,共3页
The model of double-well Bose-Einstein condensates in the strong-interaction regime is shown to reduce adiabatically to an effective two-state model describing the Rabi oscillations between the two atomic Fock states ... The model of double-well Bose-Einstein condensates in the strong-interaction regime is shown to reduce adiabatically to an effective two-state model describing the Rabi oscillations between the two atomic Fock states |N, 0〉 and [0, N〉, and the NOON states of arbitrary ultracold atoms can therefore be generated periodically from the initial state of either one of the Foek states. 展开更多
关键词 double-well Bose-Einstein condensates effective two-state model NOON states
下载PDF
Partition coefficient prediction of Baker's yeast invertase in aqueous two phase systems using hybrid group method data handling neural network 被引量:1
11
作者 Carlos Eduardo de Araújo Padilha Sérgio Dantas de Oliveira Júnior +3 位作者 Domingos Fabiano de Santana Souza Jackson Araújo de Oliveira Gorete Ribeiro de Macedo Everaldo Silvino dos Santos 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2017年第5期652-657,共6页
A hybrid GMDH neural network model has been developed in order to predict the partition coefficients of invertase from Baker's yeast. ATPS experiments were carried out changing the molar average mass of PEG(1500–... A hybrid GMDH neural network model has been developed in order to predict the partition coefficients of invertase from Baker's yeast. ATPS experiments were carried out changing the molar average mass of PEG(1500–6000 Da), p H(4.0–7.0), percentage of PEG(10.0–20.0 w/w), percentage of MgSO_4(8.0–16.0 w/w), percentage of the cell homogenate(10.0–20.0 w/w) and the percentage of MnSO_4(0–5.0 w/w) added as cosolute. The network evaluation was carried out comparing the partition coefficients obtained from the hybrid GMDH neural network with the experimental data using different statistical metrics. The hybrid GMDH neural network model showed better fitting(AARD = 32.752%) as well as good generalization capacity of the partition coefficients of the ATPS than the original GMDH network approach and a BPANN model. Therefore hybrid GMDH neural network model appears as a powerful tool for predicting partition coefficients during downstream processing of biomolecules. 展开更多
关键词 Partitioning Invertase Aqueous Two Phase System GMDH Neural network
下载PDF
Measurement of Mass Transfer Coefficients and Their Modelling of Continuous Counter-Current Aqueous Two-Phase System in a Packed Extraction Column 被引量:1
12
作者 阎恭喜 朱自强 +1 位作者 关怡新 韩兆熊 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 1999年第3期196-204,共9页
Overall dispersed side volumetric mass transfer coefficients for protein and amino acids were measured in continuous countercurrent PEG4000/KHP aqueous two-phase systems in a 57mm I.D. packed extraction column. A mode... Overall dispersed side volumetric mass transfer coefficients for protein and amino acids were measured in continuous countercurrent PEG4000/KHP aqueous two-phase systems in a 57mm I.D. packed extraction column. A model for overall dispersed side volumetric mass transfer coefficients was derived by describing the motion of the drops based upon Navier-Stokes equation combined with the relationship between mass transfer coefficients and the drop velocity. The model provides good predictions and can be successfully used in aqueous two-phase extraction. The average relative deviation between calculated values and experimental data ranges from 8% to 14%. 展开更多
关键词 aqueous two-phase system continuous countercurrent extraction mass transfer coefficient MODEL packed column
下载PDF
Numerical Simulations on Countercurrent Gas-Liquid Flow in a PWR Hot Leg with Air-Water Flow in a 1/15th Scale-Model 被引量:2
13
作者 N. Minami M. Murase +2 位作者 Y. Utanohara I. Kinoshita A. Tomiyama 《Journal of Energy and Power Engineering》 2011年第6期495-503,共9页
To clarify the countercurrent flow in a PWR hot leg under reflux condensation, numerical simulations of countercurrent air-water flow for a 1/15th scale model of the PWR hot leg were conducted using the two-fluid mode... To clarify the countercurrent flow in a PWR hot leg under reflux condensation, numerical simulations of countercurrent air-water flow for a 1/15th scale model of the PWR hot leg were conducted using the two-fluid model implemented in CFD software. In this paper, the effect of expansion of the inclined pipe, which is the actual plant geometry, was evaluated. When increasing the air velocity, CCFL characteristics and the mechanism of flow pattern transition had significant differences between the case with and without expansion of the inclined pipe. CCFL characteristics were mitigated in the case with expansion. The effect of computational grid size was also discussed. When the supplied water velocity was small, the predicted flow pattern transition point agreed well with the measured data by increasing the number of cells. On the other hand, when the air velocity was decreasing, there were no significant differences in each case. 展开更多
关键词 Mid-loop operation reflux condensation countercurrent flow hot leg numerical simulation.
下载PDF
Quench Front Progression in a Superheated Porous Medium: Experimental Analysis and Model Development
14
作者 Andrea Bachrata Florian Fichot +2 位作者 Georges Repetto Michel Quintard Joelle Fleurot 《Journal of Energy and Power Engineering》 2013年第3期514-523,共10页
In case of accident at a nuclear power plant, water sources may not be available for a long period of time and the core heats up due to the residual power. Any attempt to inject water during core degradation can lead ... In case of accident at a nuclear power plant, water sources may not be available for a long period of time and the core heats up due to the residual power. Any attempt to inject water during core degradation can lead to quenching and further fragmentation of core material. The fragmentation of fuel rods and melting of reactor core materials may result in the formation of a "debris bed". The typical particle size in a debris bed might reach few millimeters (characteristic length-scale: 1-5 mm). The two-phase flow model for reflood of the degraded core is briefly introduced in this paper. It is implemented into the ICARE-CATHARE code, developed by IRSN (Institut de radioprotection et de surete nucleaire), to study severe accident scenarios in pressurized water reactors. Currently, the French IRSN sets up two experimental facilities to study debris bed reflooding, PEARL and PRELUDE, and validate safety models. The PRELUDE program studies the complex two phase flow (water/steam), in a porous medium (diameter 180 mm, height 200 mm), initially heated to a high temperature (400℃ or 700℃). On the basis of the experimental results, thermal hydraulic features at the quench front have been analyzed. The two-phase flow model shows a good agreement with PRELUDE experimental results. 展开更多
关键词 Severe accident reflood debris bed two-phase flow model.
下载PDF
Deduction and Validation of an Eulerian-Eulerian Model for Turbulent Dilute Two-Phase Flows by Means of the Phase Indicator Function-Disperse Elements Probability Density Function
15
作者 Santiago Laín Ricardo Aliod 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2000年第3期189-202,共14页
A statistical formalism overcoming some conceptual and practical difficulties arising in existing two-phase flow (2PHF) mathematical modelling has been applied to propose a model for dilute 2PHF turbulent Hows. Phase ... A statistical formalism overcoming some conceptual and practical difficulties arising in existing two-phase flow (2PHF) mathematical modelling has been applied to propose a model for dilute 2PHF turbulent Hows. Phase interaction terms with a clear physical meaning enter the equations and the formalism provides some guidelines for the avoidance of closure assumptions or the rational approximation of these terms. Continuous phase averaged continuity, momentum, turbulent kinetic energy and turbulence dissipation rate equations have been rigorously and systematically obtained in a single step. These equations display a structure similar to that for single-phase flows. It is also assumed that dispersed phase dynamics is well described by a probability density function (pdf) equation and Eulerian continuity, momentum and fluctuating kinetic energy equations for the dispersed phase are deduced. An extension of the standard k-e turbulence model for the continuous phase is used. A gradient transport model is adopted for the dispersed phase fluctuating fluxes of momentum and kinetic energy at the non-colliding, large inertia limit. This model is then used to predict the behaviour of three axisymmetric turbulent jets of air laden with solid particles varying in size and concentration. Qualitative and quantitative numerical predictions compare reasonably well with the three different sets of experimental results, studying the influence of particle size, loading ratio and flow confinement velocity. 展开更多
关键词 two-phase flow turbulence phase indicator function pdf ensemble average jet
下载PDF
Computational fluid dynamics simulation of gas-liquid two phases flow in 320 m^3 air-blowing mechanical flotation cell using different turbulence models 被引量:3
16
作者 沈政昌 陈建华 +2 位作者 张谌虎 廖幸锦 李玉琼 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第6期2385-2392,共8页
According to the recently developed single-trough floating machine with the world's largest volume(inflatable mechanical agitation flotation machine with volume of 320 m3) in China, the gas-fluid two-phase flow in... According to the recently developed single-trough floating machine with the world's largest volume(inflatable mechanical agitation flotation machine with volume of 320 m3) in China, the gas-fluid two-phase flow in flotation cell was simulated using computational fluid dynamics method. It is shown that hexahedral mesh scheme is more suitable for the complex structure of the flotation cell than tetrahedral mesh scheme, and a mesh quality ranging from 0.7 to 1.0 is obtained. Comparative studies of the standard k-ε, k-ω and realizable k-ε turbulence models were carried out. It is indicated that the standard k-ε turbulence model could give a result relatively close to the practice and the liquid phase flow field is well characterized. In addition, two obvious recirculation zones are formed in the mixing zones, and the pressure on the rotor and stator is well characterized. Furthermore, the simulation results using improved standard k-ε turbulence model show that surface tension coefficient of 0.072, drag model of Grace and coefficient of 4, and lift coefficient of 0.001 can be achieved. The research results suggest that gas-fluid two-phase flow in large flotation cell can be well simulated using computational fluid dynamics method. 展开更多
关键词 computational fluid dynamics (CFD) simulation flotation cell gas-liquid two-phases flow
下载PDF
Large eddy simulation of a particle—laden turbulent plane jet
17
作者 金含辉 罗坤 +1 位作者 樊建人 岑可法 《Journal of Zhejiang University Science》 EI CSCD 2003年第2期175-180,共6页
Gas solid two-phase turbulent plane jet is applied to many natural s it uations and in engineering systems. To predict the particle dispersion in the ga s jet is of great importance in industrial applications and in ... Gas solid two-phase turbulent plane jet is applied to many natural s it uations and in engineering systems. To predict the particle dispersion in the ga s jet is of great importance in industrial applications and in the designing of engineering systems. A large eddy simulation of the two-phase plane jet was con d ucted to investigate the particle dispersion patterns. The particles with Stokes numbers equal to 0 0028, 0 3, 2 5, 28 (corresponding to particle diameter 1 μm , 10 μm, 30 μm, 100 μm, respectively) in \%Re\%=11 300 gas flow were studied. The simulation results of gas phase motion agreed well with previous experimental re sults. And the simulation results of the solid particles motion showed that part icles with different Stokes number have different spatial dispersion; and that p articles with intermediate Stokes number have the largest dispersion ratio. 展开更多
关键词 Large eddy simulation Particle dispersion Gas-solid two-phase plane jet
下载PDF
Modeling of coupled deformation,water flow and gas transport in soil slopes subjected to rain infiltration 被引量:20
18
作者 HU Ran CHEN YiFeng ZHOU ChuangBing 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第10期2561-2575,共15页
Rain infiltration into a soil slope leads to propagation of the wetting front, transport of air in pores and deformation of the soils, in which coupled processes among the solid, liquid and gas phases are typically in... Rain infiltration into a soil slope leads to propagation of the wetting front, transport of air in pores and deformation of the soils, in which coupled processes among the solid, liquid and gas phases are typically involved. Most previous studies on the unsaturated flow and its influence on slope stability were based on the singlephase water flow model (i.e., the Richards Equation) or the waterair two-phase flow model. The effects of gas transport and soil deformation on the movement of groundwater and the evolution of slope stability were less examined with a coupled solid-water-air model. In this paper, a numerical model was established based on the principles of the continuum mechanics and the averaging approach of the mixture theory and implemented in an FEM code for analysis of the coupled deformation, water flow and gas transport in porous media. The proposed model and the computer code were validated by the Liakopoulos drainage test over a sand column, and the significant effect of the lateral air boundary condition on the draining process of water was discussed. On this basis, the coupled processes of groundwater flow, gas transport and soil deformation in a homogeneous soil slope under a long heavy rainfall were simulated with the proposed three-phase model, and the numerical results revealed the remarkable delaying effects of gas transport and soil deformation on the propagation of the wetting front and the evolution of the slope stability. The results may provide a helpful reference for hazard assessment and control of rainfall-induced landslides. 展开更多
关键词 coupled solid-water-air model rain infiltration soil slope stability analysis finite element analysis
原文传递
Numerical study on two-phase flow through fractured porous media 被引量:15
19
作者 HUANG ZhaoQin YAO Jun +1 位作者 WANG YueYing TAO Ke 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第9期2412-2420,共9页
Based on the flux equivalent principle of a single fracture, the discrete fracture concept was developed, in which the macroscopic fractures are explicitly described as (n-l) dimensional geometry element. On the fun... Based on the flux equivalent principle of a single fracture, the discrete fracture concept was developed, in which the macroscopic fractures are explicitly described as (n-l) dimensional geometry element. On the fundamental of this simplification, the discrete-fractured model was developed which is suitable for all types of fractured porous media. The principle of discrete-fractured model was introduced in detail, and the general mathematical model was expressed subsequently. The fully coupling discrete-fractured mathematical model was implemented using Galerkin finite element method. The validity and accuracy of the model were shown through the Buckley-Leverett problem in a single fracture. Then the discrete-fractured model was applied to the two different type fractured porous media. The effect of fractures on the water flooding in fractured reservoirs was investigated. The numerical results showed that the fractures made the porous media more heterogeneous and anisotropic, and that the orientation, size, type of fracture and the connectivity of fractures network have important impacts on the two-phase flow. 展开更多
关键词 fractured porous media two-phase flow discrete fracture numerical simulation
原文传递
Second-order moment modeling of dispersed two-phase turbulence——Part 1:USM,k-ε-k_p,and non-linear k-ε-k_p two-phase turbulence models 被引量:4
20
作者 ZHOU LiXing 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第6期1098-1107,共10页
Turbulent dispersed multiphase flows,including gas-particle,gas-droplet and bubble-liquid flows,are widely encountered in various engineering facilities.Modeling of two-phase turbulence,in particular the dispersed pha... Turbulent dispersed multiphase flows,including gas-particle,gas-droplet and bubble-liquid flows,are widely encountered in various engineering facilities.Modeling of two-phase turbulence,in particular the dispersed phase turbulence,is the key problem in the Eulerian-Eulerian simulation of practical dispersed multiphase flows.Although different models were developed and used,the experimental validation shows that they cannot always give satisfactory prediction results.In this paper the present author give a detailed review of the unified second-order moment (USM),k-k p and nonlinear k-k p two-phase turbulence models,proposed by him.The derivation and closure of these models are described in detail and the experimental validation and application of these models are extensively discussed. 展开更多
关键词 dispersed multiphase flows second-order moment model two-phase turbulence
原文传递
上一页 1 2 下一页 到第
使用帮助 返回顶部