Articles de revues : « Solid gas-coupling »

1

Sun, Shujie, Xiaosai Dong, Jie Wang, Haodong Zhang et Zhenya Duan. « Research Progress on Numerical Simulation of Two-phase Flow in the Gas-solid Fluidized Bed ». E3S Web of Conferences 259 (2021) : 04002. http://dx.doi.org/10.1051/e3sconf/202125904002.

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It is difficult to accurately measure the parameters of solid particles in the experiment of the gas-solid fluidized bed. The numerical simulation plays an important role to accurately describe flow characteristics in the fluidized bed. Combined with the research work of the research group, this paper analyzes the application of numerical simulation of fluidized bed from the aspects of gas-solid coupling algorithm, drag model, flow characteristics, and reaction characteristics based on the previous studies. The specificity improvement of the gas-solid coupling algorithm and the regional application of the drag model is the trend of the recent development of numerical simulation. Previous studies mainly focus on the gas-solid two-phase flow field characteristics in the traditional fluidized bed, but few on the complex flow characteristics such as gas-solid reverse flow and the coupling with reaction characteristics. It is of great significance for designing a novel fluidized bed reactor to realize gas-solid continuous reaction to establish and improve the numerical simulation method of gas-solid non-catalytic reaction.

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Li, Sheng Zhou, Chang Bao Jiang, Jun Wei Yao et Ming Hui Li. « Solid-Gas Coupling Model and Numerical Simulation of Coal Containing Gas Based on Comsol Multiphysic ». Advanced Materials Research 616-618 (décembre 2012) : 515–20. http://dx.doi.org/10.4028/www.scientific.net/amr.616-618.515.

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Solid-gas coupling effect of coal containing gas is studied in order to understand the gas percolation mechanism in coal and rock. On the premise of that porosity and permeability of coal and rock are in dynamic changes and Klinkenberg effect, then seepage mechanics and elastic-plastic mechanics are considered together to established solid-gas coupling model of coal containing gas. With the given fixed solution conditions and parameters, the simulation results of mathematical model is found by the Comsol Multiphysic finite element software. Simulation results are consistent with the stress-strain law, deformation and failure modes of specimen in the experiment. Seepage law obtained in numerical simulation has same trends with experimental data. The elastoplastic solid-gas coupling model of coal containing gas can effectively describe the mechanical percolation characteristics of coal containing gas.

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Bing, Liang, et Li Ye. « Numerical Simulation of Gas-Solid Coupling in Coal Face ». Applied Mechanics and Materials 29-32 (août 2010) : 1791–96. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.1791.

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Gas accidents in coal face threaten the safety production. Studying on gas emission law could help us avoid. The gas-solid coupling models with different mining styles were built up. Simulation of stress-displacement-gas coupling was made by Flac3D, combining with the background of Lu Ning coal. Results shows: the longer blasting time is, the larger plastic failure zones are; with the same external loads, strains of coal are larger when considering gas-solid coupling effect, gas flow to the coal face easily. Gas pressure turns to be nonlinear along tunneling direction used blasting, the longer blasting time is, the smaller gas pressure is. The gas pressure turns to be linear 0~10m to coal face with mechanical. The greatest variation of displacement and gas pressure are 0~3m to coal face, gas emission mainly occurred here.

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Zhou, Aitao, Kai Wang, Lingpeng Fan et T. A. Kiryaeva. « Gas-solid coupling laws for deep high-gas coal seams ». International Journal of Mining Science and Technology 27, n^o 4 (juillet 2017) : 675–79. http://dx.doi.org/10.1016/j.ijmst.2017.05.016.

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Sui, Yiyong, Mengying Luo, Tangmao Lin, Guihua Liu, Yuan Zhao, Yazhou Wu et Lanqing Ren. « Numerical Simulation of Critical Production Pressure Drop of Injection and Production Wells in Gas Storage Based on Gas-Solid Coupling ». Separations 9, n^o 10 (13 octobre 2022) : 305. http://dx.doi.org/10.3390/separations9100305.

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The periodic injection-production process of natural gas in underground gas storage make the rock bear alternating load under the gas-solid coupling. The alternating load changes the physical properties of rock, and then influence the critical production pressure drop of injection-production wells in gas storage. In the case of gas-solid coupling, the decisive factors affecting the alternating load are the number of injection-production cycles and the injection-production differential pressure. Therefore, a discrete element numerical simulation model is established to simulate the gas-solid coupling process of gas storage wells under different injection-production cycle and differential pressure. The influence mechanism of injection-production cycle and differential pressure on particle cementation and primary crack is analyzed microscopically and also the influence law of injection-production cycle and differential pressure on rock mechanical properties is analyzed from the macroscopic. Finally, the influence law of injection-production cycle and differential pressure on the critical production pressure drop of injection-production wells due to gas-solid coupling can be obtained. The results show that under the influence of gas-solid coupling, the number of bonded contact cracks and micro cracks in the model increase gradually, both the elastic modulus ratio and the cohesion ratio decrease gradually with the increase of injection-production cycle and the higher the injection-production differential pressure, the greater the decline range. Then, with the injection-production cycle increasing the Poisson’s ratio increases gradually and the higher the injection-production differential pressure, the greater the increase range. Finally, the internal friction angle ratio increases greatly in the initial stage, after that decreases and then shows a linear increase. According to the influence law, the relationship model between the critical production pressure drop of injection-production wells in gas storage and the injection-production cycle and differential pressure under the gas-solid coupling will be established, which is used for the dynamic prediction of the critical production pressure drop of injection-production wells in the whole life cycle of gas storage.

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Zhu, Zhuohui, Tao Feng, Zhigang Yuan, Donghai Xie et Wei Chen. « Solid-Gas Coupling Model for Coal-Rock Mass Deformation and Pressure Relief Gas Flow in Protection Layer Mining ». Advances in Civil Engineering 2018 (2018) : 1–6. http://dx.doi.org/10.1155/2018/5162628.

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The solid-gas coupling model for mining coal-rock mass deformation and pressure relief gas flow in protection layer mining is the key to determine deformation of coal-rock mass and migration law of pressure relief gas of protection layer mining in outburst coal seams. Based on the physical coupling process between coal-rock mass deformation and pressure-relief gas migration, the coupling variable of mining coal-rock mass, a part of governing equations of gas seepage field and deformation field in mining coal-rock mass, is introduced. Then, a new solid-gas coupling mathematical model reflecting the coupling effects of gas adsorption/desorption, gas pressure, and coal-rock mass deformation on the mining coal-rock mass deformation and pressure relief gas flow is established combined with the corresponding definite conditions. It lays a theoretical foundation for the numerical calculation of the deformation of mining coal-rock mass and the migration law of gas under pressure relief in the outburst coal seam group.

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Niu, Dong, et Hongtao Gao. « Thermal Conductivity of Ordered Porous Structures Coupling Gas and Solid Phases : A Molecular Dynamics Study ». Materials 14, n^o 9 (26 avril 2021) : 2221. http://dx.doi.org/10.3390/ma14092221.

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Heat transfer in a porous solid−gas mixture system is an important process for many industrial applications. Optimization design of heat insulation material is very important in many fields such as pipe insulation, thermal protection of spacecraft, and building insulation. Understanding the micro-mechanism of the solid−gas coupling effect is necessary for the design of insulation material. The prediction of thermal conductivity is difficult for some kinds of porous materials due to the coupling impact of solid and gas. In this study, the Grand Canonical Monte Carlo method (GCMC) and molecular dynamics simulation (MD) are used to investigate the thermal conductivity for the ordered porous structures of intersecting square rods. The effect of gas concentration (pressure) and solid−gas interaction on thermal conductivity is revealed. The simulation results show that for different framework structures the pressure effect on thermal conductivity presents an inconsistent mode which is different from previous studies. Under the same pressure, the thermal conductivity is barely changed for different interactions between gas and solid phases. This study provides the feasibility for the direct calculation of thermal conductivity for porous structures coupling gas and solid phases using molecular dynamics simulation. The heat transfer in porous structures containing gas could be understood on a fundamental level.

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Wang, Deng Ke, Jian Ping Wei, Heng Jie Qin et Le Wei. « Research on Solid-Gas Coupling Dynamic Model for Loaded Coal Containing Gas ». Advanced Materials Research 594-597 (novembre 2012) : 446–51. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.446.

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Considering the variation of the porosity and permeability of coal containing gas at differential deformation stages, a dynamic model for porosity and permeability is developed based on the previous researches. Furthermore, taking coal containing gas as a kind of isotropic elastoplastic material and taking into account the effect of gas adsorption, the stress and seepage equations are derived and, the solid gas coupling model for coal containing gas is constructed, which is appropriate to describe the skeleton deformability of coal containing gas and the compressibility of gas under the solid-gas interaction condition. In addition, the numerical simulation model is built by using the finite element method, and the numerical calculation solution of the model for a special loading case is given in term of the constraint conditions and corresponding parameters. The research results may have significance for further enriching and improving solid-gas coupling theories for coal containing gas.

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Hu, Shixiong, Xiao Liu et Xianzhong Li. « Fluid–Solid Coupling Model and Simulation of Gas-Bearing Coal for Energy Security and Sustainability ». Processes 8, n^o 2 (24 février 2020) : 254. http://dx.doi.org/10.3390/pr8020254.

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The optimum design of gas drainage boreholes is crucial for energy security and sustainability in coal mining. Therefore, the construction of fluid–solid coupling models and numerical simulation analyses are key problems for gas drainage boreholes. This work is based on the basic theory of fluid–solid coupling, the correlation definition between coal porosity and permeability, and previous studies on the influence of adsorption expansion, change in pore free gas pressure, and the Klinkenberg effect on gas flow in coal. A mathematical model of the dynamic evolution of coal permeability and porosity is derived. A fluid–solid coupling model of gas-bearing coal and the related partial differential equation for gas migration in coal are established. Combined with an example of the measurement of the drilling radius of the bedding layer in a coal mine, a coupled numerical solution under negative pressure extraction conditions is derived by using COMSOL Multiphysics simulation software. Numerical simulation results show that the solution can effectively guide gas extraction and discharge during mining. This study provides theoretical and methodological guidance for energy security and coal mining sustainability.

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Fukun, Xiao, Meng Xin, Li Lianchong, Liu Jianfeng, Liu Gang, Liu Zhijun et Xu Lei. « Thermos-Solid-Gas Coupling Dynamic Model and Numerical Simulation of Coal Containing Gas ». Geofluids 2020 (22 décembre 2020) : 1–9. http://dx.doi.org/10.1155/2020/8837425.

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Based on gas seepage characteristics and the basic thermo-solid-gas coupling theory, the porosity model and the dynamic permeability model of coal body containing gas were derived. Based on the relationship between gas pressure, principal stress and temperature, and gas seepage, the thermo-solid-gas coupling dynamic model was established. Initial values and boundary conditions for the model were determined. Numerical simulations using this model were done to predict the gas flow behavior of a gassy coal sample. By using the thermo-solid-gas coupling model, the gas pressure, temperature, and principal stress influence, the change law of the pressure field, displacement field, stress field, temperature field, and permeability were numerically simulated. Research results show the following: (1) Gas pressure and displacement from the top to the end of the model gradually reduce, and stress from the top to the end gradually increases. The average permeability of the Y Z section of the model tends to decrease with the rise of the gas pressure, and the decrease amplitude slows down from the top of the model to the bottom. (2) When the principal stress and temperature are constant, the permeability decreases first and then flattens with the gas pressure. The permeability increases with the decrease of temperature while the gas pressure and principal stress remain unchanged.

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Zhang, Dongxu, Ting Min, Ming Jiang, Yaxiong Yu et Qiang Zhou. « Numerical Simulation of Fluidized Bed Gasifier Coupled with Solid Oxide Fuel Cell Fed with Solid Carbon ». Energies 14, n^o 10 (13 mai 2021) : 2800. http://dx.doi.org/10.3390/en14102800.

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A model of a fluidized bed coupled with direct carbon solid oxide fuel cell (SOFC) is developed to explore the effect of coupling between fluidized bed and solid oxide fuel cell. Three gas–solid flow regimes are involved including fixed bed, delayed bubbling bed and bubbling bed. The anode reaction of SOFC is treated as the coupling processes of Boudouard gasification of carbon and electrochemical oxidation of CO. The effects of inlet velocity of the fluidizing agent CO2, carbon activity, channel width and coupling extent on the system performance are investigated. The results show that the inlet velocity of CO2 can promote the gasification rate in the anode, but too high velocities may lower CO molar fraction. The gasification rate generally increases with the increase of the channel width and carbon activity. The overlapping area between the anode surface and the initial carbon bed, gas–solid regime and carbon activity have a significant influence on the gasification rate and the maximum current density the system can support. Overall, the mass transport in the anode is dramatically enhanced by the expansion of the carbon bed, back-mixing, solid mixing and gas mixing, especially for the delayed bubbling bed and bubbling bed. This indicates that the adopted coupling method is feasible to improve the anode performance of direct carbon solid oxide fuel cell.

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Abdulrasol, Nibras M., et Waleed M. S, Kadhem. « SIMULATION OF SULFUR DIOXIDE REMOVAL FROM A GAS STREAM IN A FLUIDIZED-BED REACTOR ». Journal of Engineering 16, n^o 03 (1 septembre 2010) : 5438–58. http://dx.doi.org/10.31026/j.eng.2010.03.12.

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The object of this work is to model and simulate a fluidized bed desulfurization reactor by coupling a reactor kinetic model with a fluidized bed model based on two –phase theory(bubbling-bed model) proposed by Kunni and Levenspiel(1968).This model is useful for analysis of a reaction involving gas and solid. It generates the conversion data with respect to reaction time of both reacting gas and solids in a continuous flow(for both gas and solids) in fluidized bed. The flue gas or stack gas from a combustor which normally contains sulfur dioxide mixed with excess air is used as the fluidizing gas with calcium oxide as the fluidized solids . Calcium oxide is quite capable of reacting with 2 SO to effect its removal from the gas phase according to the exothermic reaction :s  CaO + g  SO2 + 2 1g  O2 s  CaSO4 + HeatThe effects of the solid feed rate, SO2 concentration in the flue gas, bed height, bed diameter, particle size, fluidizing velocity and operating temperature on the extent of conversion of both gas and solid were investigated, for a fixed feed rate of flue gas and SO2concentration (50.000 cm3/sec ,3-5% by volume)at temperature range of (950-1000oC)and pressure 1 atm.

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Shen, Wei Jun, Xi Zhe Li, Jia Liang Lu et Xiao Hua Liu. « The Fluid-Solid Coupling Seepage Mathematical Model of Shale Gas ». Applied Mechanics and Materials 275-277 (janvier 2013) : 598–602. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.598.

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In this paper, the stress equation is available by introducing the principle of effective stress in porous media into fluid-solid coupling seepage and considering the conditions of equilibrium. According to the continuity equation of fluid mechanics, considering the interactions between shale gas and rock-soil body, the differential equation of seepage flow is obtained. Through introducing the velocity component of rock particles into the seepage field, the pore fluid pressure in seepage field is introduced into the deformation field, so as to realize the interaction between the fluid-solid coupling seepage. Based on auxiliary boundary conditions in the above equations, the paper establishes the integrated fluid-coupling seepage mathematical model of shale gas, and it will provide the corresponding theoretical and realistic significance in the development of shale gas.

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Liu, Xiao Li, Wen Jing Si et Chun Ying Zhu. « Research on the Gas Migration Regularity of Municipal Solid Waste Landfill in the Solid-Liquid-Gas-Heat Interaction ». Advanced Materials Research 243-249 (mai 2011) : 2216–19. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.2216.

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With the establishment of large municipal solid waste landfills, the interaction of geological environment in landfill (seepage field, stress field and temperature field, etc.) has not to be ignored. The multi-field coupling problem of the municipal solid waste landfill is getting attention. But at present the study mainly concentrated on the solid-liquid-gas-heat coupling problem, the study of the waste gas of the municipal solid waste landfill is less. Gas diffusions, gas emissions, and gas collection are related to the secondary pollution problems of the municipal solid waste landfill. This paper established mathematical model which based on the solid-liquid-gas-heat interaction and researched the gas migration rule of the municipal solid waste landfills. The mainly work are as follows: (1) the definite conditions of dynamic model, (2) the solution of dynamic model, (3) results and analysis. The main conclusions are as follows: (1) Pore pressure along the gas flow direction is nonlinear distribution and shows decline trend. As time increases, the pore pressure of each horizontal section decreases. (2)The volumetric strain of the municipal solid waste landfill is nonlinear distribution along the gas flow direction and shows an increasing tendency. As time increases, volumetric strain of each horizontal section increases.(3)As the change of time, the pore pressure first increases, then decreases.(4) In the initial stage, as the change of time, gas output increases rapidly. When it achieves the maximum size, the production quantity of gas reduces and gradually tends to be a quantitative value.

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Cheng, Hongmei, Yuxia Dong, Xiru Li et Heng Chen. « The dynamic evolution analysis of gas seepage field during the mining process of protective layer ». Thermal Science 23, n^o 3 Part A (2019) : 1371–78. http://dx.doi.org/10.2298/tsci180611135c.

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The process of gas extraction by the protective layer mining is actually the multi-field coupling process. In this paper, the governing equations of the gas diffusion and seepage in the damaged coal and rock mass under the condition of the coupling action of gas and solid are established. A multi-field coupling analytical program is compiled by the FORTRAN language. The distribution and dynamic evolution law of the gas seepage field of the protected layer are calculated and analyzed. The result will provide the data support for the gas extraction design.

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Han, Yafen, Shuai Li, Haidong Liu et Yucong Li. « Lattice Boltzmann Simulation of Coupling Heat Transfer between Solid and Gas Phases of Nanoporous Materials ». Nanomaterials 12, n^o 19 (29 septembre 2022) : 3424. http://dx.doi.org/10.3390/nano12193424.

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In order to deeply study the heat conduction of nanoporous aerogel, a model of gas-solid heat conduction was established based on the microstructure of aerogel. The model was divided into two subdomains with uniform mesh because of the different gas-solid characteristics, and simulation was performed on each domain using the lattice Boltzmann method. The value of temperature on the boundaries of subdomains was determined by interpolation. Finally, the temperature distribution and the thermal conductivity were maintained. It can be concluded that when the gas-phase scale was fixed, the temperature distribution of the solid phase became more uniform when the scale increased; when the solid-phase scale was fixed, the temperature jump on the gas-solid interface decreased with the increase in the gas-phase scale; and the thermal conductivity of gas-solid coupling varied with the scale of the gas phase or solid phase, showing a scale effect in varying degrees.

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Wu, Jing, Xiong Chen et Xi Yu. « Numerical Analysis of Fluid-Structure Interaction during Ignition Process for Solid Rocket Motor with Stress-Reliver ». Applied Mechanics and Materials 184-185 (juin 2012) : 328–32. http://dx.doi.org/10.4028/www.scientific.net/amm.184-185.328.

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During the start-up of ignition process, the solid rocket motor is typically involved in fluid-structure coupling process. The propellant deforms under the gas pressure, thereby influents the gas flow in turn. The aim of this paper is to investigate the coupled effect between fluid and structure during the start-up of ignition process in solid rocket motor by coupling Fluent and Abaqus via MpCCI. The numerical result shows that during the initial stage, the gas flows onto the structural surface. There is a relative enclosure space in thewing slot inside the motor, which causes big deformation on propellant grain and stress reliever. This space is the high-risk area for structural deboning in solid rocket motor.

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Qi, Tai Yue, Bo Lei, Rui Wang, Yan Li et Zong Yang Li. « Solid-fluid-gas coupling prediction of harmful gas eruption in shield tunneling ». Tunnelling and Underground Space Technology 71 (janvier 2018) : 126–37. http://dx.doi.org/10.1016/j.tust.2017.08.014.

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Varaksin, Aleksey Yu, et Sergei V. Ryzhkov. « Mathematical Modeling of Gas-Solid Two-Phase Flows : Problems, Achievements and Perspectives (A Review) ». Mathematics 11, n^o 15 (26 juillet 2023) : 3290. http://dx.doi.org/10.3390/math11153290.

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Mathematical modeling is the most important tool for constructing theories of different kinds of two-phase flows. This review is devoted to the analysis of the introduction of mathematical modeling to two-phase flows, where solid particles mainly serve as the dispersed phase. The main problems and features of the study of gas-solid two-phase flows are included. The main characteristics of gas flows with solid particles are discussed, and the classification of two-phase flows is developed based on these characteristics. The Lagrangian and Euler approaches to modeling the motion of a dispersed phase (particles) are described. A great deal of attention is paid to the consideration of numerical simulation methods that provide descriptions of turbulent gas flow at different hierarchical levels (RANS, LES, and DNS), different levels of description of interphase interactions (one-way coupling (OWC), two-way coupling (TWC), and four-way coupling (FWC)), and different levels of interface resolution (partial-point (PP) and particle-resolved (PR)). Examples of studies carried out on the basis of the identified approaches are excluded, and they are also excluded for the mathematical modeling of various classes of gas-solid two-phase flows.

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Xiao-long, Zhao, Zhang Jun-an, Dong Hao, Fang Zhou et Li Jun-ning. « Numerical Simulation and Experimental Study on the Gas-Solid Coupling of the Aerostatic Thrust Bearing with Elastic Equalizing Pressure Groove ». Shock and Vibration 2017 (2017) : 1–11. http://dx.doi.org/10.1155/2017/5091452.

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Aiming at the problem of low stiffness of aerostatic bearing, according to the principle of gas-solid coupling, this paper designs a kind of aerostatic thrust bearing with elastic equalizing pressure groove (EEPG) and investigates the effect of elastic equalizing pressure groove (EEPG) on the stiffness of aerostatic bearing. According to the physical model of the bearing, one deduces the deformation control equation of the elastic equalizing pressure groove and the control equation of gas lubrication, using finite difference method to derive the control equations and coupling calculation. The bearing capacity and stiffness of aerostatic bearing with EEPG in different gas film clearance are obtained. The calculation results show that the stiffness increased by 59%. The results of numerical calculation and experimental results have good consistency, proving the gas-solid coupling method can improve the bearing stiffness.

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Zhang, R. H., D. Y. Chen, J. H. Liu, H. L. Zhao, C. H. He et J. W. Jin. « Study on the gas pressure impact test of gun propellant and fluid-solid coupling dynamics simulation ». Journal of Physics : Conference Series 2891, n^o 5 (1 décembre 2024) : 052004. https://doi.org/10.1088/1742-6596/2891/5/052004.

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Abstract In order to reveal the mechanical response characteristics of high-energy propellant under high pressure gas impact, the gas pressure impact test and fluid-solid coupling dynamics simulation of propellant are carried out. The propellant gas pressure impact test device is established. The propellant gas pressure impact tests are conducted under different quality of depressant and thickness of iron pressure relief fragments. The gas pressure-time curve, gas pressure rise and decreasing rate are obtained. It is found that longitudinal and transverse cracks occur locally in propellant under high pressure impact. In order to reveal that mechanical property change of propellant under gas impact, the simulation study on fluid-solid coupling dynamics of gas pressure impact test is carried out using ANSYS Workbench multi-field coupling platform. The flow field pressure in the device and the change process of fixed propellant stress and deformation are obtained. The error of monitoring point simulation and test pressure is 5.3%. The maximum peak value of internal flow field pressure reaches 71.6MPa. The average value of maximum stress and maximum deformation of fixed propellant reaches 220MPa and 1.77mm respectively. It reveals the mechanical response characteristics of propellant under high pressure gas impact.

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Zhang, Xiaoguang, Fan Yu, Yu Jin, Lixin Zhao, Suling Wang et Baorui Xu. « Study on flow field characteristics of gas-liquid hydrocyclone separation under vibration conditions ». PLOS ONE 19, n^o 7 (12 juillet 2024) : e0307110. http://dx.doi.org/10.1371/journal.pone.0307110.

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The complex vibration phenomenon occurs in the downhole environment of the gas-liquid hydrocyclone, which affects the flow field in the hydrocyclone. In order to study the influence of vibration on hydrocyclone separation, the characteristics of the flow field in the downhole gas-liquid hydrocyclone were analyzed and studied under the condition of vibration coupling. Based on Computational Fluid Dynamics (CFD), Computational Solid Mechanics Method (CSM) and fluid-solid coupling method, a fluid-solid coupling mechanical model of a gas-liquid cyclone is established. It is found that under the condition of vibration coupling, the velocity components in the three directions of the hydrocyclone flow field change obviously. The peak values of tangential velocity and axial velocity decrease, and the asymmetry of radial velocity increases. The distribution regularity of vorticity and turbulence intensity in the overflow pipe becomes worse. Among them, the vorticity intensity of the overflow pipe is obviously enhanced, and the higher turbulence intensity near the wall occupies more area distribution range. The gas-liquid separation efficiency of the hydrocyclone will decrease with the increase of the rotational speed of the screw pump, and the degree of reduction can reach more than 10%. However, this effect will decrease with the increase of the rotational speed of the screw pump, so the excitation effect caused by the rotational speed has a maximum limit on the flow field.

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Long, Wei, Yan Liu, Zhang Yong Wu, Jing Tao Wei et Zi Yong Mo. « Fluid-Solid Coupling Heat Analysis of Aerostatic Guide Components ». Applied Mechanics and Materials 779 (juillet 2015) : 50–54. http://dx.doi.org/10.4028/www.scientific.net/amm.779.50.

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This paper presents the parameters and assumptions of the hydrostatic guide rail in both ideal and actual working conditions, the simulate calculation of fluid-solid heat coupling field between gas film and the bearing surface is finished by Fluent based on finite volume method. By analyze and compare the results after post-treatment, we gain the effects caused by guide way’s structure and deformation on the formation of film pressure field, temperature field inside gas film, besides this paper also provides relate conclusions.

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Okafor, Peter-Ebuka, et Guihua Tang. « Gas-solid coupling in a randomly distributed ceramic nanofibrous aerogel ». International Journal of Thermal Sciences 200 (juin 2024) : 108988. http://dx.doi.org/10.1016/j.ijthermalsci.2024.108988.

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Zheng, Chao, Tian Hong Yang, Qing Lei Yu et Peng Hai Zhang. « Analysis on Gas Drainage Based on High-Pressure Water Injection ». Advanced Materials Research 524-527 (mai 2012) : 1147–52. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.1147.

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Gas outburst has been a major disaster in high gas mine. Flow law of gas in coal seam was studied, and gas drainage measures were proposed were extraordinarily useful for mine safety and rational use of gas. Finite element numerical method was applied to study changing law of gas pressure before and after the high-pressure water injection and damage deformation of coal under high-pressure water based on fluid-solid coupling and gas-solid coupling and damage theory. This research shows that: (1) a damage area was generated in coal seam under high-pressure water injection. Range of the damage area increase rapidly at the start of water injection and gradually slow down with the passage of time, eventually be more stable. (2) The permeability of rock mass of coal under high-pressure water injection. (3) High-pressure water injection had significant effect on gas drainage in a certain area. It provided a theoretical basis for selecting reasonable design programs to product gas by high-pressure water injection technology.

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Pan, Haoran, Wei Li, Kaikai Luo, Rui Wang, Liesheng Xiao et Zeqing Lian. « A Thermal Fluid–Solid Coupling Simulation of Gas Fuel Control Valves for High-Precision Gas Turbines ». Aerospace 10, n^o 6 (3 juin 2023) : 531. http://dx.doi.org/10.3390/aerospace10060531.

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Gas fuel control valves play important roles in the control of gas flow in high-precision gas turbines. To clarify the influence of coupling between the structure and the fluid system, a thermal fluid–solid coupling mechanism is presented based on numerical investigations carried out using a dynamic mesh technique. Valve core deformation can affect the outlet gas flow accuracy. At 2% valve opening, the gas temperature contributes 93% to the deformation. The effect of deformation on the flow accuracy at 6% valve opening and 4% valve opening is increased by 4.8% and 7.3%, respectively. The fluctuation range of the gas temperature and pressure in front of the valve should be strictly controlled to ensure the high precision and high stability of the outlet flow. These results help to clarify the processes that occur in the valve flow path, leading to the flow control instability observed in the control valve.

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Cui, Wei, Rixuan Song, Fafeng Xia, Qiang Zhang et Peter Wang. « A Fluid-Solid-Magnetic Coupling Algorithm of Internal Crack Growth in the Weld of Oil and Gas Pipelines ». Mathematical Problems in Engineering 2018 (3 octobre 2018) : 1–16. http://dx.doi.org/10.1155/2018/8167321.

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In order to characterize the dynamic process of the crack growth in the weld of oil and gas pipelines, a mathematical model of fluid-solid-magnetic multifield coupling was constructed in this paper. Based on this model, the bidirectional fluid-solid coupling and unidirectional magnetic structure coupling caused by the weld deformation were achieved by dynamic application of the fluid permeation pressure, calculating the internal crack growth in the pipe weld, reconstructing the computational grid near the internal crack, and discussing the characteristics of the magnetic leakage field in the process of the internal crack growth in pipe weld. Thus, a fluid-solid-magnetic coupling algorithm for the internal crack growth in pipe welds considering fluid permeation pressure is established. According to the characteristics of the internal crack opening distance, internal crack growth length, crack tip energy release rate, peak values of magnetic induction intensity level, and vertical component, the process of the internal crack growth is measured. The results show that the fluid osmotic pressure accelerates the process of the internal crack growth and this algorithm can solve the problem of the characterization and evaluation of crack growth in pipe welds under fluid-solid-magnetic coupling action.

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Gheni, Mamtimin, Zhen Shi Li, Wei Cheng, Wei Bing Liu et Lie Yu. « Study on Numerical Simulation Method of Periodic Symmetric Struts Support Coupling with Heat Flow and Solid ». Key Engineering Materials 462-463 (janvier 2011) : 985–89. http://dx.doi.org/10.4028/www.scientific.net/kem.462-463.985.

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In this paper, the fluid solid coupling method is used and the FE (Finite Element) analysis is conducted for the PSSS (Periodic Symmetric Struts Support) of the large scale GT(Gas Turbine), and the overall thermal stress and thermal deformation are obtained. From the structure feature of the gas turbine, the initial boundary conditions of the high-temperature gas flow field and thermal deformation are analyzed at first. Then the coupling relationship between fluid and solid two phases is expressed mathematically, and the thermal conductivity is considered for calculation of heat transfer process, and the overall temperature field is obtained. Finally the thermal boundary condition of PSSS is defined and the structural FE analysis is conducted. At the same time, the thermal stress field and thermal deformation field are discussed for overall PSSS structure.

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He, Sheng-quan, Long-zhe Jin, Sheng-nan Ou et Xiao-hong Ming. « Soft coal solid–gas coupling similar material for coal and gas outburst simulation tests ». Journal of Geophysics and Engineering 15, n^o 5 (19 juin 2018) : 2033–46. http://dx.doi.org/10.1088/1742-2140/aac098.

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Wang, Kai, Bo Li, Jian-Ping Wei et Peng Li. « Gas-solid coupling analysis and numerical simulation of the dynamic process of gas drainage ». Journal of Coal Science and Engineering (China) 19, n^o 2 (30 mai 2013) : 187–92. http://dx.doi.org/10.1007/s12404-013-0213-5.

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Qi, Enze, Fei Xiong, Yun Zhang, Linchao Wang, Yi Xue et Yingpeng Fu. « Gas Fracturing Simulation of Shale-Gas Reservoirs Considering Damage Effects and Fluid–Solid Coupling ». Water 16, n^o 9 (29 avril 2024) : 1278. http://dx.doi.org/10.3390/w16091278.

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With the increasing demand for energy and the depletion of traditional resources, the development of alternative energy sources has become a critical issue. Shale gas, as an abundant and widely distributed resource, has great potential as a substitute for conventional natural gas. However, due to the low permeability of shale-gas reservoirs, efficient extraction poses significant challenges. The application of hydraulic fracturing technology has been proven to effectively enhance rock permeability, but the influence of environmental factors on its efficiency remains unclear. In this study, we investigate the impact of gas fracturing on shale-gas extraction efficiency under varying environmental conditions using numerical simulations. Our simulations provide a comprehensive analysis of the physical changes that occur during the fracturing process, allowing us to evaluate the effects of gas fracturing on rock mechanics and permeability. We find that gas fracturing can effectively induce internal fractures within the rock, and the magnitude of tensile stress decreases gradually during the process. The boundary pressure of the rock mass is an important factor affecting the effectiveness of gas fracturing, as it exhibits an inverse relationship with the gas content present within the rock specimen. Furthermore, the VL constant demonstrates a direct correlation with gas content, while the permeability and PL constant exhibit an inverse relationship with it. Our simulation results provide insights into the optimization of gas fracturing technology under different geological parameter conditions, offering significant guidance for its practical applications.

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Jin, Jin, Qi Wang et Song Zhang. « Effect of High-Sintering-Temperature Reduction Behavior on Coke Solution Loss Reaction with Different Thermal Properties ». Metals 13, n^o 1 (6 janvier 2023) : 117. http://dx.doi.org/10.3390/met13010117.

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With the shortage of high-quality coking coal resources and the pursuit of low-cost smelting, the types and sources of coal have changed. Therefore, it is difficult to establish an effective correlation between the existing evaluation indexes of coke thermal performance and the production indexes of the blast furnace. The dissolution deterioration of coke directly affects the production benefits of the blast furnace, and the dissolution deterioration of blast furnace coke is the result of ore–coke coupling. To better understand the mechanism of the coupling reaction relative to the thermal properties of coke, this paper experimentally studies ore–coke coupling between two kinds of coke and one kind of blast furnace standing sinter which have different reactivities but are used in practical applications. This method adopts a matched thermogravimetric device. By analyzing and calculating the high-temperature reduction behavior and characteristics of the sinter and the dissolution loss behavior and characteristics of coke in the gas–solid coupling reaction test of coke and sinter, and comparing and fitting the coupling reaction factors of the coupling reaction and the thermal properties of coke, it was revealed that the real degradation behavior of coke was affected by the reduction reaction of the sinter. The results show that the temperature range with the best matching degree between the reduction reaction of oxygen supply from sinter and the gasification reaction of oxygen consumption from coke is at a position where the coupling factor is closest to 1. In the gas–solid coupling reaction between low-reactivity coke and sinter, the strongest dissolution rate, RCSL, is approximately 1200 °C, while in the gas–solid coupling reaction between high-reactivity coke and sinter, the RCSL is approximately 1100 °C. The minimum strength, CSCSL, of high-active coke and sinter after dissolution is approximately 1100 °C, while that of low-active coke and sinter after dissolution is approximately 1200 °C. It is shown that there is a good linear relationship between the RCSL of high- and low-reactive coke and strength after dissolution loss CSCSL.

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Wang, Wen Shuai, et Xun Liu. « Experiments and Analysis on Thermoelectric Generators of Automotive Exhaust under the Multi-Field Coupling ». Advanced Materials Research 850-851 (décembre 2013) : 217–20. http://dx.doi.org/10.4028/www.scientific.net/amr.850-851.217.

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The present experimental and analytic study reports a new thermoelectric generation (TEG) system, working with heat exchangers to produce electricity from a limited hot surface area. Results are obtained for generators using a coupling condition of heat-flow and flow-solid coupling analysis to obtain the temperature, heat, pressure field of heat exchanger. These fields couple together to solve the multi-field coupling of the flow, solid, heat, and then the simulation result is compared with the test bench experiment of TEG, providing a theoretical and experimental basis for the present new exhaust gas waste heat recovery system.

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Sugimoto, N., et H. Hyodo. « Effects of heat conduction in a wall on thermoacoustic-wave propagation ». Journal of Fluid Mechanics 697 (6 mars 2012) : 60–91. http://dx.doi.org/10.1017/jfm.2012.36.

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AbstractThis paper examines the effects of heat conduction in a wall on thermoacoustic-wave propagation in a gas, as a continuation of the previous paper (Sugimoto, J. Fluid Mech., 2010, vol. 658, pp. 89–116), enclosed in two-dimensional channels by a stack of plates or in a periodic array of circular tubes, both being subject to a temperature gradient axially and extending infinitely. Within the narrow-tube approximation employed previously, the linearized system of fluid-dynamical equations for the ideal gas coupled with the equation for heat conduction in the solid wall are reduced to single thermoacoustic-wave equations in the respective cases. In this process, temperatures of the gas and the solid wall are sought to the first order of asymptotic expansions in a small parameter determined by the square root of the product of the ratio of heat capacity of gas per volume to that of the solid, and the ratio of thermal conductivity of the gas to that of the solid. The effects of heat conduction introduce into the equation two hereditary terms due to triple coupling among viscous diffusion, thermal diffusion of the gas and that of the solid, and due to double coupling between thermal diffusions of the gas and solid. While the thermoacoutic-wave equations are valid always for any form of disturbances generally, approximate equations are derived from them for a short-time behaviour and a long-time behaviour. For the short-time behaviour, the effects of heat conduction are negligible, while for the long-time behaviour, they will affect the propagation as a wall becomes thinner. It is unveiled that when the geometry of the channels or the tubes, and the combination of the gas and the solid satisfy special conditions, the asymptotic expansions exhibit non-uniformity, i.e. a resonance occurs, and then the thermoacoustic-wave equations break down. Discussion is given on modifications in the resonant case by taking full account of the effects of heat conduction, and also on the effects on the acoustic fields.

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Li, Junlin, et Yujia Li. « Analysis of Factors Affecting the Pigging Effect ». Academic Journal of Science and Technology 9, n^o 3 (12 mars 2024) : 211–16. http://dx.doi.org/10.54097/b5t0fv54.

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In order to ensure production and life safety in the process of oil and gas production, it is necessary to regularly perform pigging operations on pipelines. The fluid-solid coupling effect between the pig and pipeline impurities is complex, and theoretical methods are difficult to solve. Related experimental research is costly and experimental data is difficult to obtain. In order to further explore the factors affecting the cleaning effect of pigs in bi-metal composite pipes, this paper introduces fluid-solid coupling and uses the CEL method to establish a fluid-solid coupling model for the pig, pipeline impurities, and pipeline. The cleaning effect of the pipeline impurities is analyzed in terms of the shape, interference fit amount, and speed of the pig.

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Jiang, Chengyao, Ke Xu, Jiahui Rao, Jiaming Liu, Yushan Li, Yu Song, Mengyao Li, Yangxia Zheng et Wei Lu. « Establishment and Solution of a Finite Element Gas Exchange Model in Greenhouse-Grown Tomatoes for Two-Dimensional Porous Media with Light Quantity and Light Direction ». Agriculture 14, n^o 8 (23 juillet 2024) : 1209. http://dx.doi.org/10.3390/agriculture14081209.

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An accurate gas utilization model is essential for precisely detecting plant photosynthetic capacity. Existing equipment for measuring the plant photosynthetic rate typically considers the key parameters of mesophyll cell conductance and a photosynthetic model based on the carbon reaction process under direct light conditions. However, the light environment signals received by the plant canopy not only vary significantly in incidence angles, but the effective light intensity also differs greatly from the measured values under vertical incidence conditions. To reduce the deviation between existing photosynthetic models and the actual photosynthetic efficiency of leaves, this study employs the gas diffusion method from engineering, using the finite element approach. Based on elastic mechanics and seepage mechanics, the internal stress field control equation of tomato leaves and the two-phase flow equation under a CO2 porous medium were derived. A mathematical model of porous gas–liquid two-phase fluid-solid coupling was established, solved, and analyzed. Preliminary verification was conducted through tests. The results show that in the initial stage of CO2 entering the leaf, the gas flow velocity is higher because of the larger pressure gradient between the pore and the leaf. In this stage, the gas diffusion rate is higher. As the intake time increases, the pressure gradient gradually decreases, and the inlet velocity slows down. Consequently, the diffusion rate gradually reduces. Because of the coupling of light quantity and light direction, the gas diffusion rate significantly increases compared with the uncoupled model. Additionally, a diffusion model that does not consider fluid–solid coupling will overestimate the gas flow rate as the depth of gas entry increases. Therefore, the internal gas diffusion model must account for the effect of coupling on the diffusion rate.

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Jin, Jin, Qi Wang et Song Zhang. « Kinetics and mechanisms of coke and sinter on the coupling reaction to evaluate the integrated effects of coke solution loss reaction on blast furnace processes ». Metallurgical Research & ; Technology 118, n^o 5 (2021) : 506. http://dx.doi.org/10.1051/metal/2021065.

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The gas–solid coupling reaction kinetics at a constant temperature at each temperature point in the high-temperature cohesive zone in a blast furnace environment were simulated using industrial blast furnace raw material sinter, the low-reactivity conventional coke, and the high-reactivity unconventional coke. In this method, the coupling test of the sinter and coke at constant temperature was performed after a supporting thermogravimetric device was used to carry out pre-reduction, and the coupling reaction of industrial-grade sinter and coke were used to obtain the kinetic data and a mathematical description of the reaction mechanism. The results showed that in the high-temperature cohesive zone, the gasification reaction rate of the low-reactivity coke is the rate-controlling step of the gas–solid coupling reaction rate between the sinter and the conventional low-reactivity coke. By contrast, the rate-controlling step of the gas–solid coupling reaction rate between the sinter and highly-reactive coke is the reduction of sinter. The maximum difference between the initial reaction temperatures of the two kinds of coke samples is 30 °C. Using the same testing standard as coke strength after the reaction (CSR) to test the thermal strength of coke after the coupling reaction, it was found that there is little difference between the thermal strengths (CSRp) of the two kinds of coke after the reaction. The thermal strength of the high-reactivity coke is the worst at 1100 °C, and that of coke with low reactivity is the worst at 1200 °C. The highly reactive coke can operate smoothly in the blast furnace of the cohesive zone and this is explained from the perspective of kinetics. This knowledge provides guidance for the evaluation of the capability of coke to resist solution loss.

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Li, Hong Li, et Yang Dong Li. « Numerical Simulation of Gas-Liquid-Solid Circulating Fluidized Bed (CFB) ». Applied Mechanics and Materials 433-435 (octobre 2013) : 1988–91. http://dx.doi.org/10.4028/www.scientific.net/amm.433-435.1988.

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Through summary of multiphase flow coupling, considerate the conservation of mass and momentum conservation, used the gas phase as a continuous phase, liquid phase and solid phase as dispersed phase, CFB has been simulated with the help of Eulerian model. It show that the local gas holdup increases from the computational domain inlet to the outlet, the local solid holdup decreases from the computational domain inlet to the outlet, and the local liquid holdup decreases from the computational domain inlet to the outlet.

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Wang, Yue Hong, Yue Ping Qin, Jiu Ling Zhang et Jia Li Wen. « Simulation on Parameters Temperature Field by Gas-Solid Coupling in Goaf ». Applied Mechanics and Materials 229-231 (novembre 2012) : 1815–18. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.1815.

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For solution the complex and rapidly changing question of temperature field in mining goaf, the simulation on dynamic temperature field of parameters coupling is carried out under different working coditions based on high-efficiency finite volume method (FVM) and the moving characteristic of working face. The theory analysis, the laboratory experiment, the simulation of software and the example confirmation, above all methods are used in order to find the change of temperature field in goaf. The result is found that there has spontaneous combustion in goaf when the moving speed of working face is below 1.2m/d; besides that the temperature in goaf fall and the high-temperature region is extend to the deep of goaf. Another result is exist that there has the linear increase relationship of the intensity of leak air and the temperature in goaf, and the high-temperature region is extend to the deep of goaf contrary to the effect of the coal oxidation properties, which increases the risk of coal spontaneous combustion in goaf. Especially , all the data of temperature is visualization by picture of 3D, so the distribution map of temperature in goaf is visualized distinctly. The research results provide a theoretical basis for understanding the real situation and preventing spontaneous combustion in goaf.

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Kanther, Wolfgang, Christof Grüner, Sören Götz et Karl Strauß. « Coupling of deterministic and stochastic simulation methods for gas-solid-flows ». PAMM 3, n^o 1 (décembre 2003) : 408–11. http://dx.doi.org/10.1002/pamm.200310476.

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Peng-xiang, Zhao. « Study of influencing factors on the peak dissipation energy at physical simulation similar material of coal-rock solid-gas coupling ». Functional materials 24, n^o 2 (22 juin 2017) : 005–340. http://dx.doi.org/10.15407/fm24.02.335.

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Tchoumi, Thierry, François Peyraut et Rodolphe Bolot. « Electromagnetic–Computational Fluid Dynamics Couplings in Tungsten Inert Gas Welding Processes—Development of a New Linearization Procedure for the Joule Production Term ». Applied Mechanics 5, n^o 1 (28 février 2024) : 121–40. http://dx.doi.org/10.3390/applmech5010008.

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The finite volume method (FVM) was used to model a tungsten inert gas (TIG) arc welding process. A two-dimensional axisymmetric model of arc plasma integrating fluid–solid coupling was developed by solving electromagnetic and thermal equations in both the gas domain and the solid cathode. In addition, two additional coupling equations were considered in the gaseous domain where the arc is generated. This model also included the actual geometry of torch components such as the gas diffuser, the nozzle, and the electrode. The model was assessed using numerous numerical examples related to the prediction of the argon plasma mass fraction, temperature distribution, velocity fields, pressure, and electric potential in the plasma. A new linearization method was developed for the source term in the energy conservation equation, allowing for the prediction of Joule effects without artificial conductibility. This new method enhances the efficiency of the classical approach used in the literature.

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Zhang, Xiu Hua, et Yan Yan Wu. « Numerical Analysis of Shock Wave Propagation Law of Internal Gas Explosion ». Applied Mechanics and Materials 105-107 (septembre 2011) : 299–302. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.299.

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The purpose of this paper is to research on shock wave propagation law of internal gas explosion. The multi-material Eulerian and Lagrangian coupling algorithm was adopt. Using ANSYS/LS-DYNA dynamic analysis software to build frame structure, air and gas explosion models. Multiple ALE elements for simulating air and gas explosion material the analysis of blast shock wave propagation in a three-story steel frame structure and the characteristics of explosion pressure using fluid-structure coupling method are carried out. The conclusions show that fluid-structure coupling method can well simulated shock wave propagation of internal gas explosion, and the pressure peak of blast shock wave increased with the increasing of the blast air initial energy. Locality is the characteristic of explosion pressure in sealed space, and the pressure pass weakly when it propagates in solid.

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Chen, Jian, Zhi Guo Wang, Lei Zhang et Wen Zhe Yang. « The Analysis Model of Coupling Heat Flux in Heavy Oil Reservoir and its Application ». Advanced Materials Research 594-597 (novembre 2012) : 2425–29. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.2425.

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There are heat-fluid-solid multi-field coupling in the thermal recovery reservoir. At present, the researches on oil reservoir porous media coupling are mostly on fluid-solid. According to the oil reservoir characteristics, this paper puts forward the “white box” analysis model on the heat and mass transfer processes in thermal recovery reservoir. On this basis, the analysis and stimulation of the various porosity effects on heat and mass transfer processes use CMG software. This result can provide theoretical basis for enhancing oil/gas recovery.

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El-Behery, S. M., W. A. El-Askary, M. H. Hamed et K. A. Ibrahim. « Numerical and experimental study of heat transfer in gas-solid flow : Particle cooling ». International Review of Applied Sciences and Engineering 3, n^o 1 (1 juin 2012) : 21–29. http://dx.doi.org/10.1556/irase.3.2012.1.3.

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Abstract Heat transfer in gas-solid two-phase flow is investigated numerically and experimentally. The numerical computations are carried out using four-way coupling Eulerian-Lagrangian approach. The effects of particle rotation and lift forces are included in the model. The gas-phase turbulence is modeled via low Reynolds number k-ε turbulence models. The SIMPLE algorithm is extended to take the effect of compressibility into account. The experimental study is performed using crushed limestone to simulate the solid phase. The effects of Reynolds numbers, particles size and temperature on the pressure drop and the temperature of the phases are investigated. The model predictions are found to be in a good agreement with available experimental data for high speed gas-solid flow and present experimental data for low speed flow. The present results indicate that heat transfer in gas solid flow can be modeled using ideal gas incompressible flow model at low conveying speed, while for high speed flow, a full compressible model should be used.

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Weng, Guangyuan, Qixuan Xie, Chenxi Xu, Peng Zhang et Xiang Zhang. « Seismic Response of Cable-Stayed Spanning Pipeline Considering Medium-Pipeline Fluid–Solid Coupling Dynamic Effect ». Processes 11, n^o 2 (18 janvier 2023) : 313. http://dx.doi.org/10.3390/pr11020313.

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With the aim of determining the influence of the fluid–structure coupling dynamic effect of the oil and gas transmission medium and pipeline on the seismic response, an oil pipeline supported by a cable-stayed spanning structure was taken as the study object. Kinetic equations taking into account the action of oil and gas medium were studied, and a finite element model structure considering the additional-mass method and the fluid–structure coupling effect were established separately. In addition, the mechanism of the oil–gas–pipeline coupling action on the seismic response of pipeline structure was analyzed, and the results were obtained. The results show that the pipeline has a minimal seismic response at the abutment location, the seismic response gradually increases along the abutment to the main tower, and the seismic response reach is maximized at about one-fifth of the bridge platform. The seismic response of the oil and gas pipeline model structure using the additional-mass method is generally more significant than that based on the fluid–solid coupled dynamic model; moreover, the maximum displacement response differs by about 24%, and the maximum acceleration response differs by approximately 30%, indicating that the oil and gas medium has a certain viscoelastic damping effect on the seismic response of the oil pipeline, which provides a reference for the seismic response calculation theory and analysis method of cable-stayed spanning oil pipelines.

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Shi, Jianyong, Shi Shu, Minghao Chen, Xun Wu, Feng Dong et Kunyong Zhang. « Simulation of gas–leachate pressure in various tested landfills using the differential quadrature method ». Waste Management & ; Research : The Journal for a Sustainable Circular Economy 38, n^o 12 (4 mars 2020) : 1306–13. http://dx.doi.org/10.1177/0734242x20908942.

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The degradation of solid waste in landfills results in the coupled migration of gas and leachate through the pore spaces in waste material. The existing analytical methods cannot be used to obtain a solution for the gas–leachate coupled migration problem. This study used the differential quadrature method to solve the gas and leachate phase continuity equations considering the effect of the gas–leachate coupling. The calculation results were verified based on the calculated data of previous studies. The results of the field gas collection tests and the laboratory degradation tests were fitted using the peak gas generation equation. The peak values of gas generation were found between 0.94 and 20.29 years in the field tests, and between 0.09 and 0.19 years in the laboratory tests. The gas pressure calculated by parameters fitting of the field tests and the laboratory tests were less than 1 kPa and greater than 8 kPa, respectively. Considering the gas-leachate coupling effect, the pore gas pressure in the simulated landfill increased by approximately 20%, and the peak pore gas pressure occurred slightly earlier than that without consideration of the coupling effect.

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Xu, Hong, Hua Dong Yang et Guang Ru Hua. « The Effect of Inlet Conditions on Particle Deposition in Axial Flow Compressor ». Advanced Materials Research 915-916 (avril 2014) : 1066–69. http://dx.doi.org/10.4028/www.scientific.net/amr.915-916.1066.

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Axial flow compressor is an important component, so the compressor performance is of crucial. Fouling changes blade geometry and blade surface roughness is increased, thus aerodynamic performance is affected. The flow of gas phase and gas-solid coupling phase are implemented to reveal the effect of inlet condition on particle deposition. Based on Euler-Lagrange model, this paper made numerical simulation of gas-solid two phase flow in the axial flow compressor rotor cascade. Simulation result shows that the increase of inlet temperature can result in the reduction of particle volume fraction. And particle mass concentration is affected by particle mass flow rate.

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Qian, Cheng, Yaxi Xie, Xiujun Zhang, Ruiqi Zhou et Bixin Mou. « Study on Numerical Simulation of Gas–Water Two-Phase Micro-Seepage Considering Fluid–Solid Coupling in the Cleats of Coal Rocks ». Energies 17, n^o 4 (16 février 2024) : 928. http://dx.doi.org/10.3390/en17040928.

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The increasing demand for natural gas energy will promote unconventional natural gas, such as coal seam gas and shale gas, to play a key role in future energy development. The mechanical properties of coal seams are weaker compared with conventional natural gas reservoirs. The fluid–solid coupling phenomenon exists widely at the pore scale and macro scale of coal seams, and runs through the whole process of coalbed gas exploitation. The objective of this study is to establish a microscale gas–water flow model for coalbed methane considering fluid structure coupling. Frist, this study used scanning electron microscopy (SEM) to obtain microscopic pore images of coal rocks. Then, we constructed a numerical model to simulate the movement of coalbed methane and water within the scale of coal cleats based on the Navier–Stokes equation, phase field method, and solid mechanics theory. Finally, we analyzed the effects of injection pressure and wettability on the microscopic two-phase seepage characteristics and displacement efficiency of coal. Our research shows that when the injection pressure is increased from 60 kPa to 120 kPa, the displacement completion time is shortened from 1.3 × 10−4 s to 7 × 10−5 s, and the time is doubled, resulting in a final gas saturation of 98%. The contact angle increases from 45° to 120°, and the final gas saturation increases from 0.871 to 0.992, an increase of 12.2%.

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Luo, Langli, Liang Li, Daniel K. Schreiber, Yang He, Donald R. Baer, Stephen M. Bruemmer et Chongmin Wang. « Deciphering atomistic mechanisms of the gas-solid interfacial reaction during alloy oxidation ». Science Advances 6, n^o 17 (avril 2020) : eaay8491. http://dx.doi.org/10.1126/sciadv.aay8491.

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Gas-solid interfacial reaction is critical to many technological applications from heterogeneous catalysis to stress corrosion cracking. A prominent question that remains unclear is how gas and solid interact beyond chemisorption to form a stable interphase for bridging subsequent gas-solid reactions. Here, we report real-time atomic-scale observations of Ni-Al alloy oxidation reaction from initial surface adsorption to interfacial reaction into the bulk. We found distinct atomistic mechanisms for oxide growth in O2 and H2O vapor, featuring a “step-edge” mechanism with severe interfacial strain in O2, and a “subsurface” one in H2O. Ab initio density functional theory simulations rationalize the H2O dissociation to favor the formation of a disordered oxide, which promotes ion diffusion to the oxide-metal interface and leads to an eased interfacial strain, therefore enhancing inward oxidation. Our findings depict a complete pathway for the Ni-Al surface oxidation reaction and delineate the delicate coupling of chemomechanical effect on gas-solid interactions.

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