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Letteratura scientifica selezionata sul tema "Solid gas-coupling"

Autore: Grafiati

Pubblicato: 25 gennaio 2025

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Articoli di riviste sul tema "Solid gas-coupling"

Sun, Shujie, Xiaosai Dong, Jie Wang, Haodong Zhang e 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 e Ming Hui Li. "Solid-Gas Coupling Model and Numerical Simulation of Coal Containing Gas Based on Comsol Multiphysic". Advanced Materials Research 616-618 (dicembre 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, e Li Ye. "Numerical Simulation of Gas-Solid Coupling in Coal Face". Applied Mechanics and Materials 29-32 (agosto 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 e T. A. Kiryaeva. "Gas-solid coupling laws for deep high-gas coal seams". International Journal of Mining Science and Technology 27, n. 4 (luglio 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 e 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. 10 (13 ottobre 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 e 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, e Hongtao Gao. "Thermal Conductivity of Ordered Porous Structures Coupling Gas and Solid Phases: A Molecular Dynamics Study". Materials 14, n. 9 (26 aprile 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 e 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 e Xianzhong Li. "Fluid–Solid Coupling Model and Simulation of Gas-Bearing Coal for Energy Security and Sustainability". Processes 8, n. 2 (24 febbraio 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 e Xu Lei. "Thermos-Solid-Gas Coupling Dynamic Model and Numerical Simulation of Coal Containing Gas". Geofluids 2020 (22 dicembre 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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Più fonti

Tesi sul tema "Solid gas-coupling"

Hechenblaikner, Gerald. "Mode coupling and superfluidity of a Bose-Einstein condensed gas". Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249397.

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Zeren, Zafer. "Lagrangian stochastic modeling of turbulent gas-solid flows with two-way coupling in homogeneous isotropic turbulence". Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0106/document.

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Dans ce travail de thèse, réalisé à l'IMFT, nous nous sommes intéressés aux écoulements turbulents diphasiques gaz-solides et plus particulièrement au phénomène de couplage inverse qui correspond à la modulation de la turbulence par la phase dispersée. Ce mécanisme est crucial pour les écoulements à forts chargements massiques. Dans cette thèse, nous avons considéré une turbulence homogène isotrope stationnaire sans gravité dans laquelle des particules sont suivies individuellement d'une façon Lagrangienne. La turbulence du fluide porteur est obtenue par des simulations directes (DNS). Les particules sont sphériques, rigides et d'une taille inférieure aux plus petites échelles de la turbulence. Leur densité est bien plus grande que la densité du fluide. Dans ce cadre, la force la plus importante agissant sur les particules est celle de traînée. Les interactions inter-particules ainsi que la gravité ne sont pas prises en compte. Pour modéliser ce type d'écoulement, une approche stochastique est utilisée pour laquelle l'accélération du fluide est modélisée par une équation de Langevin. L'originalité de ce travail est la prise en compte de l'effet de la modulation de la turbulence par un terme additionnel. Nous avons proposé deux modèles : une force de couplage moyenne qui est définie à partir des vitesses moyennes des phases, et une force instantanée qui est définie à l'aide du formalisme mésoscopique Eulérien. La fermeture des modèles s’appuie sur la fonction d’autocorrélation Lagrangienne et l’équation de transport de l’énergie cinétique. Les modèles sont testés en terme de prédiction de la vitesse de dérive et des corrélations fluide-particule. Les résultats montrent que le modèle moyen, plus simple, prend en compte les effets principaux du couplage inverse. Cependant, le problème de fermeture pratique est reporté sur la modélisation de l’échelle intégrale Lagrangienne et l’énergie cinétique de la turbulence du fluide vue par les particules
In this thesis, performed in IMFT, we are interested in the turbulent gas-solid flows and more specifically, in the phenomenon of turbulence modulation which is the modification of the structure of the turbulence due to the solid particles. This mechanism is crucial in flows with high particle mass-loadings. In this work, we considered a homogeneous isotropic turbulence without gravity kept stationary with stochastic type forcing. Discrete particles are tracked individually in Lagrangian manner. Turbulence of the carrier phase is obtained by using DNS. The particles are spherical, rigid and of a diameter smaller than the smallest scales of turbulence. Their density is very large in comparison to the density of the fluid. In this configuration the only force acting on the particles is the drag force. Volume fraction of particles is very small and inter-particle interactions are not considered. To model this type of flow, a stochastic approach is used where the fluid element accel- eration is modeled using stochastic Langevin equation. The originality in this work is an additional term in the stochastic equation which integrates the effect of the particles on the trajectory of fluid elements. To model this term, we proposed two types of modeling: a mean drag model which is defined using the mean velocities from the mean transport equations of the both phases and an instantaneous drag term which is written with the help of the Mesoscopic Eulerian Approach. The closure of the models is based on the Lagrangian auto- correlation function of the fluid velocity and on the transport equation of the fluid kinetic energies. The models are tested in terms of the fluid-particle correlations and fluid-particle turbulent drift velocity. The results show that the mean model, simple, takes into account the principal physical mechanism of turbulence modulation. However, practical closure problem is brought forward to the Lagrangian integral scale and the fluid kinetic energy of the fluid turbulence viewed by the particles

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Dinh, Duy Cuong. "Development of a Detailed Approach to Model the Solid Pyrolysis with the Coupling Between Solid and Gases Intra-Pores Phenomena". Electronic Thesis or Diss., Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2024. http://www.theses.fr/2024ESMA0029.

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La pyrolyse du bois est un processus crucial dans la science de la sécurité incendie car elle affecte la décomposition thermique et le comportement de combustion des matériaux. Le bois est un composite biopolymères (cellulose, hémicellulose et lignine) qui subit une pyrolyse complexe, produisant du charbon solide, du goudron et des gaz. Le processus de pyrolyse modifie également certaines caractéristiques importantes de l’échantillon (densité, conductivité thermique, capacité thermique, porosité, perméabilité, émissivité...) qui évoluent tout au long de la réaction de décomposition. La compréhension de ces transformations est cruciale pour la modélisation du comportement du feu des solides. Les évolutions des masses normalisées finales entre les expériences ATG et en cône calorimètre remettent en cause les modèles de taux de réaction solides existants. Les modèles actuels supposent souvent un ordre de réaction égal à 1, ce qui conduit à des inexactitudes lorsque l’ordre de réaction diffère de 1. Pour surmonter ces lacunes, un nouveau modèle basé sur la conversion, appelé ”Masse Initiale Virtuelle”, est proposé. Ce modèle est basé sur des données issues d’essais ATG. Il calcule la vitesse de chaque réaction dans le cas de mécanismes de pyrolyse complexes, avec de nombreuses réactions séquentielles et compétitives et a été implémenté en C++. Le code C++ de ce modèle est intégré avec l’outil DAKOTA pour permettre l’optimisation multi-objectif par algorithme génétique (MOGA) des paramètres cinétiques sur plusieurs vitesses de chauffage. Ce modèle de « Masse Initiale Virtuelle » est intégré dans la boîte à outils d’analyse des matériaux poreux basée sur OpenFOAM (PATO), un outil Open Source créé par la NASA. D’autres modèles de transferts de masse, de chaleur et de conservation des espèces en plus des propriétés des matériaux sont créés dans ce nouveau cadre. Un modèle informatique pour les réactions secondaires (réactions en phase gazeuse qui produisent du charbon secondaire) est implémenté dans PATO. Les simulations des essais en cône calorimètre sont effectuées dans des modèles 1D et 2D axisymétriques pour explorer l’influence des propriétés anisotropes du bois, en particulier l’orientation de ses fibres. La comparaison des modèles avec et sans réactions secondaires démontre le rôle de ces dernières dans la distribution de la chaleur et la production de charbon secondaire. Ce résultat explique la différence de masse finale observée expérimentalement entre les tests en ATG et en cône calorimètre. La comparaison des résultats expérimentaux et numériques montre la pertinence de cette approche pour simuler le comportement complexe de la pyrolyse du bois en mettant en évidence l’importance des voies de réaction, des réactions secondaires, du transfert de chaleur, du transfert de masse et des phénomènes d’interaction intra-pore
Pyrolysis of wood is a crucial process in fire safety science because it affects the thermal decomposition and combustion behavior of materials. Wood, a composite of biopolymeric components (cellulose, hemicellulose and lignin) undergoes complex pyrolysis to yield solid char, tar and gases as it thermally decomposes. The pyrolysis process also changes some important characteristics of the sample (density, thermal conductivity, heat capacity, porosity, permeability, emissivity...) that evolve throughout the reaction. Understanding these transformations is crucial for the correct modeling of fire behavior and material response under different thermal conditions. Different final normalized mass between TGA and cone calorimeter experiments challenge existing solid reaction rate models, according to experimental studies. Current models often assume a reaction order of 1, which oversimplifies the complexity of wood pyrolysis and leads to inaccuracies when the reaction order differs from 1. To overcome these shortcomings, a brand new conversion-based model, called ”Virtual Initial Mass”, is proposed. This model, based on TGA data, calculates the reaction rate for each reaction in complicated pyrolysis mechanisms. It supports mechanisms with numerous sequential and competitive reactions and has been implemented in C++. The C++ code for this model is integrated with the DAKOTA toolkit to perform multi objective genetic algorithm (MOGA) optimization of kinetic parameters for multiple heating rates. This ”Virtual Initial Mass” model is integrated in the Porous material Analysis Toolbox based on OpenFOAM (PATO) an Open Source tool distributed by NASA. Further mass transfer, heat transfer, species conservation models in addition to material properties are created within this new framework. A computational model for secondary reactions (gas-phase reactions that produce secondary char) is implemented in PATO. These secondary reactions solidify the sample and distribute heat back into the system. Simulations of cone calorimeter tests are performed in 1D and 2D axisymmetric models to explore the influence of anisotropic wood properties, particularly the orientation of wood fibers. Comparison of models with and without secondary reactions demonstrates their role in heat distribution and secondary char production and points out the experimentally observed difference in normalized mass between TGA and cone calorimeter tests. The model is verified by comparison with experimental results to show that it can simulate the complicated behavior of wood pyrolysis as well as emphasizes the importance of reaction pathways, secondary reactions, heat transfer, mass transfer and intra-pore interaction phenomena

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Capitoli di libri sul tema "Solid gas-coupling"

Wang, Shuai, Kun Luo, Chenshu Hu e Jianren Fan. "Investigation of Gas-Solid Flow Dynamics and Heat Transfer in Fluidized Beds by Using DEM-LES Coupling Approach". In Springer Proceedings in Physics, 1023–35. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1926-5_107.

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Oostveen, Jack P. "Mechanics of a Soil, a Dynamically Coupled Solid-Water-Gas System". In Thermo-Hydromechanical and Chemical Coupling in Geomaterials and Applications, 121–29. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118623565.ch10.

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Oostveen, Jack P. "Mechanics of a Soil, a Dynamically Coupled Solid-Water-Gas System". In Thermo-Hydromechanical and Chemical Coupling in Geomaterials and Applications, 131–39. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118623565.ch11.

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Oostveen, Jack P. "Mechanics of a Soil, a Dynamically Coupled Solid-Water-Gas System". In Thermo-Hydromechanical and Chemical Coupling in Geomaterials and Applications, 113–20. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118623565.ch9.

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Micalizzi, Giuseppe, Mariosimone Zoccali, Emanuela Trovato e Luigi Mondello. "Untargeted and Targeted Analysis by Using Innovative and Automated SPME Methods Combined with Various Chromatographic Techniques". In Evolution of Solid Phase Microextraction Technology, 249–68. The Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/bk9781839167300-00249.

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This book chapter focuses on the use and the coupling of solid phase microextraction (SPME) to chromatography techniques such as gas chromatography (GC) and liquid chromatography (HPLC). SPME has a prominent position among sample preparation methods, because it is a simple, sensitive, rapid, and solvent-free technique, suitable for the extraction of polar and non-polar compounds from gaseous, liquid, and solid samples. The possibility of using different stationary phases suitable for volatile and non-volatile molecules makes this technique ideal for GC and HPLC applications. Within this chapter, the development of new fiber coatings with higher extraction efficiency, selectivity, and stability is presented, as well as the on-line coupling of SPME to chromatographic instruments which has made this technique suitable for the extraction of targeted and untargeted compounds. Great attention is also paid to the coupling of SPME with most common mass spectrometry (MS) instruments, as well as with universal and selective detectors useful for revealing targeted and untargeted chemical species. Furthermore, the use of the SPME technique hyphenated with comprehensive two-dimensional gas chromatography (GC × GC) separation is discussed as an alternative approach to conventional GC for analysing compounds of interest in targeted and untargeted modes.

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Mirabelli, Mario F. "Direct Coupling of SPME to Mass Spectrometry". In Evolution of Solid Phase Microextraction Technology, 290–314. The Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/bk9781839167300-00290.

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Solid-phase microextraction devices are normally analyzed by gas or liquid chromatography. Their use has become increasingly widespread since their introduction in 1990, and nowadays most analytical laboratories use or have used SPME as an efficient and green method to perform analyte extraction and sample clean-up in one step. The SPME technique is intrinsically flexible, and allows for a high degree of optimization with regard to the extracting phase, as well as the way sample is analyzed. Since its introduction, researchers have been trying different ways to transfer analytes extracted from the solid phase to a mass spectrometer, with the aim to increase throughput and reduce solvent, gas usage and costs associated with conventional chromatographic techniques. Furthermore, but not less important, for pure fun of developing new, more efficient and sensitive analytical strategies! This chapter aims at providing a comprehensive overview of the most relevant non-chromatographic mass spectrometric approaches developed for SPME. Technical aspects of each SPME-MS approach will be discussed, highlighting their advantages, disadvantages and future potential developments. Particular emphasis will be given on the most recent direct coupling approaches using novel ionization approaches, and a concise overview of the existing applications will also be provided.

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Weng, Lingang, Qinfeng Shi, Weiming Lu, Keji Qi, Qing Ye, Anfei Luo e Jinbiao Wang. "Pilot Study on Deep Denitrification from Municipal Solid Waste Incineration Flue Gas by Narrow Pulse Discharge Reaction Coupling with Wet Adsorption". In Advances in Transdisciplinary Engineering. IOS Press, 2023. http://dx.doi.org/10.3233/atde230375.

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To solve the issues existed in the traditional deep denitrification treatment technology for Municipal Solid Waste Incineration flue gas, such as complex system, large investment and high operating cost, a new method of deep denitrification by narrow pulse discharge reaction coupling with wet adsorption was proposed. The deep denitration of municipal solid waste incineration flue gas via the non-thermal plasma generated by the self-developed nanosecond pulse power corona discharge was studied. The results show that the removal efficiency of NO and NOx was enhanced when the power supply frequency and residence time were increased. Under the case with single corona discharge reactor when the peak voltage is 82 kV, the frequency is 400 Hz and the residence time is 2s, the removal efficiency of NO and NOx is 81.0% or 44.8% respectively. NOx removal efficiency can be significantly improved by the process of narrow pulse discharge reaction coupling with wet absorption, the average concentration of NOx at the outlet is 43.9 mg/m3, and the average removal efficiency of NOx is 64.1%, which is 19.8% higher than the efficiency of single narrow pulse discharge reaction, the narrow pulse discharge reactor has no obvious effect on the conversion of the original low concentration N2O and CO in the municipal solid waste incineration flue gas, nor new N2O and CO were produced. The research results of this paper have positive guiding significance for the industrial application of narrow pulse discharge reactor in the deep denitration of municipal solid waste incineration flue gas.

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Mascrez, Steven, Damien Eggermont e Giorgia Purcaro. "SPME and Chromatographic Fingerprints in Food Analysis". In Evolution of Solid Phase Microextraction Technology, 494–535. The Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/bk9781839167300-00494.

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This chapter focus on the application of solid-phase microextraction (SPME) in food analysis. A preliminary overview of the evolution of food analysis over the years from a technical viewpoint will be provided. This development has been followed by the evolution from more targeted towards untargeted and fingerprinting approaches. In this scenario, the coupling of SPME with gas chromatography (GC) and particularly with comprehensive multidimensional GC (GC × GC) has played a fundamental role in enhancing significantly the level of information that can be extrapolated from a chromatographic fingerprint. Applications on different food commodities are discussed, emphasizing the applications that more deeply exploited this novel approach.

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Li, Xin, e Yanjie Wei. "Numerical simulation for gas-injected cyclone separator by fluid-solid coupling algorithm". In Advances in Energy Equipment Science and Engineering, 2035–40. CRC Press, 2015. http://dx.doi.org/10.1201/b19126-394.

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Cheng, YuanFang, e LingDong Li. "Fluid-Solid Coupling Numerical Simulation on Natural Gas Production from Hydrate Reservoirs by Depressurization". In Advances in Natural Gas Technology. InTech, 2012. http://dx.doi.org/10.5772/38090.

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Atti di convegni sul tema "Solid gas-coupling"

Shi, Shengnan, Fanyu Zhang, Chao Wang, Bin Liu, Liang Xu e Jianwen Li. "Numerical Simulation of Gas-solid Coupling in Garbage Pneumatic Conveying System". In 2024 IEEE 25th China Conference on System Simulation Technology and its Application (CCSSTA), 92–97. IEEE, 2024. http://dx.doi.org/10.1109/ccssta62096.2024.10691750.

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Simonin, Olivier, e Kyle D. Squires. "On Two-Way Coupling in Gas-Solid Turbulent Flows". In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45739.

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Abstract (sommario):

An analysis of kinetic energy transfer in particle-laden turbulent flows is presented. The present study focuses on the subset in which dispersed-phase motion is restricted to particles in translation, particle diameters are smaller than the smallest lengthscales in the turbulent carrier flow, and the dispersed phase is present at negligible volume fraction. An analysis of the separate and exact two-fluid mean and turbulent kinetic energy transport equations shows that momentum exchange between the phases results in a transfer of kinetic energy from the mean to the fluctuating motion of the two-phase mixture. The source term accounting for fluid-particle coupling in the fluid turbulent kinetic energy equation is written as the sum of three parts, the first part representing the production of velocity fluctuations in the particle wake (“pseudo turbulence”), the second and third contributions — which act primarily on the larger scales of the fluid turbulent motion — representing a damping effect due to the turbulent fluctuation of the drag force and the effect of the transport of the particles by the fluid turbulence against their mean relative motion. A schematic representation of the energy transfers in particle-laden mixtures is also presented for the simplified systems under consideration, consistent with the separation of scales between perturbations introduced at the scale of the particle and the large, energy-containing scales of fluid turbulent motion. Implications of the energy transfers for ensemble-averaged modeling approaches are discussed, along with computational techniques that account for the back-effect of the particles on the flow using the point-force approximation. It is shown that the point-force approximation as typically implemented only accounts for the modulation of the large eddies, the contribution to wake production is not included, being implicitly assumed to be in local equilibrium with the corresponding viscous dissipation.

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Uribe, J., Richard J. A. Howard e M. Rabbitt. "Fluid-Solid coupling in advanced gas-cooled reactor thermohydraulics". In THMT-12. Proceedings of the Seventh International Symposium On Turbulence, Heat and Mass Transfer Palermo, Italy, 24-27 September, 2012. Connecticut: Begellhouse, 2012. http://dx.doi.org/10.1615/ichmt.2012.procsevintsympturbheattransfpal.1350.

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Peng, Wenshan, Xuewen Cao, Kun Xu, Jinjuan Li e Yin Fan. "Erosion regularities of gas pipelines based on the gas-solid two-way coupling method". In MATHEMATICAL SCIENCES AND ITS APPLICATIONS. Author(s), 2017. http://dx.doi.org/10.1063/1.4971915.

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Pialat, Xavier, Olivier Simonin e Philippe Villedieu. "Direct Coupling Between Eulerian and Lagrangian Approaches in Turbulent Gas-Solid Flows". In ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/fedsm2006-98122.

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The purpose of this paper is both to present and validate the methodology of a hybrid method coupling a Eulerian and a Lagrangian approaches in turbulent gas-particle flows. The knowledge of the dispersed phase is displayed in terms of a joint fluid-particle probability density function (pdf) which obeys a Boltzmann-like equation. We chose two different ways of resolution of this equation, depending on the required level of description. The first one is a stochastic Lagrangian approach which embeds a Langevin equation for the fluid velocity seen along the particle path. The second one is a Eulerian second-order momentum approach derived in the same frame as the preceding one. These two approaches are then coupled through half-fluxes. This procedures allows well-posed boundary conditions stemmed from previous time-step statistics for the two approaches. The aim is to provide a methodology able to take into account physical phenomena such as particle bouncing on rough walls or deposition in inhomogeneous flows with a reasonable numerical cost. The paper present the methodology and validations in the case of inert monodispersed particle in a turbulent shear flow without two-way coupling. Comparisons of the results of the hybrid method with each approach and LES/DPS results indicate that the hybrid method could become a powerful simulation tool for gas-particle flows.

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Huang, Wei, Xiaoli Jin e Liying Wang. "One Way Fluid Solid Coupling Analysis of Gas Mask Based on ANSYS-CFX". In 2016 6th International Conference on Mechatronics, Computer and Education Informationization (MCEI 2016). Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/mcei-16.2016.260.

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"Optimization of small seeds cleaning equipment based on CFD-DEM gas-solid coupling". In 2016 ASABE International Meeting. American Society of Agricultural and Biological Engineers, 2016. http://dx.doi.org/10.13031/aim.20162460132.

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Hu, Jipu, Yuyang Shen, Ruixiang Wang, Kuaiyuan Feng, Lei Lou e Hui Guo. "Multiphysics Coupling Analysis of an FCM-Fueled Gas-Cooled Microreactor". In 2024 31st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/icone31-124442.

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Abstract The micro high-temperature gas-cooled reactor (mHTGR) is a compact, efficient, and safe nuclear reactor using fully ceramic microencapsulated (FCM) fuel. This study focuses on the core design and multi-physics analysis of a 15MWt mHTGR, which uses helium as the coolant, graphite as the moderator and reflector, and control rods for reactivity control. The reactor is designed to operate continuously for 20 years without refueling. A model coupling multiple physics of a typical fuel assembly was developed using OpenMC and ABAQUS software. The model is simplified by dividing it into 3D solid heat transfer with 2D fluid-solid interface conduction and 1D fluid heat transport. Coupled multi-physics simulations are then performed under steady-state and two typical accident conditions. During steady-state operation, the core coolant flow rate is 9.0 kg/s, and the outlet temperature is 904.6 K. The maximum temperature of 1149 K occurs at a distance of 100 cm from the outlet. In transient simulations, the peak fuel temperature reaches 1204 K during a 200 pcm reactivity insertion and remains almost unchanged during a loss of flow accident. The results show that the core exhibited good transient response characteristics and inherent safety.

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Xu, Guohui, Jian Zhou, Mingjian Lu, Haipeng Geng, Yanhua Sun, Lie Yu, Lihua Yang et al. "Supporting Structure Performances Analysis of Heavy-Duty Gas Turbine Based on Fluid-Solid Coupling Method". In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42098.

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In order to achieve high working efficiency, modern gas turbines operate at high temperature which is close to the melting points of metal alloys. However, the support of turbine end suffers the thermal deformation. And the journal center position is also changed due to the effects of high temperature and shaft gravity. Tangential or radial supporting structures, which are composed of supporting struts, diffuser cones, hot and cooling fluid channel, are widely used in gas turbine hot end. Cooling technology is usually used to keep the bearing temperature in a reasonable range to meet requirements of strength and deformation of the supporting struts. In this paper, three major assumptions are proposed: (a) radiation is not considered, (b) cooling flow system is only partially modeled and analysis assumes significantly higher cooling flow that is not typical for current engines, and (c) only steady state heat transfer is considered. And a 3D fluid-solid coupled model based on finite-element method (FEM) is built to analyze the performances of both the tangential and the radial support. The temperature distribution, thermal deformation and stress of supports are obtained from CFD and strength analysis. The results show that either the tangential or radial support is used in a 270MW gas turbine; the thermal stress is about 90.3% of total stress which is produced by both thermal effects and shaft gravity. Comparing to the results from radial supports, it can be seen that the struts stress and position variation of journal center of tangential support are smaller. Due to a rotational effect of the bearing housing caused by the deformation of the tangential struts, the thermal stress in these tangential struts can be relieved to some extent. When both thermal effect and shaft gravity are considered, the stress of each tangential supporting strut is almost uniformly distributed, which is beneficial to the stability of rotor system in the gas turbine.

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Zhang, Ri, e Haixiao Liu. "Numerical Simulation of Solid Particle Erosion in a 90 Degree Bend for Gas Flow". In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23656.

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Solid particle erosion in piping systems is a serious concern of integrity management in the oil and gas production, which has been widely predicted by the numerical simulation method. In the present work, every step of the comprehensive procedure is verified when applied to predicting the bend erosion for gas flow, and improvements are made by comparing different computational models. Firstly, five turbulent models are implemented to model the flow field in a 90 degree bend for gas flow and examined by the static pressure and velocity profile measured in experiments. Secondly, the particle velocities calculated by fully coupling and one-way coupling are compared with experimental data. Finally, based on the knowledge of flow modeling and particle tracking, four classic erosion equations are introduced to calculate the penetration rates in a 90 degree bend. By comparing with the experimental data available in the literature, it indicates that the k–ε model is the most accurate and effective turbulent model for gas pipe flow; the fully coupling makes the simulation of particle motion closer to measured data; and the Grant and Tabakoff equation presents better performance than other equations.

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