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Identifying the enhancement mechanism of Al/MoO_(3) reactive multilayered films on the ignition ability of semiconductor bridge using a one-dimensional gas-solid two-phase flow model
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作者 Jianbing Xu Yuxuan Zhou +3 位作者 Yun Shen Yueting Wang Yinghua Ye Ruiqi Shen 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第3期168-179,共12页
Energetic Semiconductor bridge(ESCB)based on reactive multilayered films(RMFs)has a promising application in the miniature and intelligence of initiator and pyrotechnics device.Understanding the ignition enhancement m... Energetic Semiconductor bridge(ESCB)based on reactive multilayered films(RMFs)has a promising application in the miniature and intelligence of initiator and pyrotechnics device.Understanding the ignition enhancement mechanism of RMFs on semiconductor bridge(SCB)during the ignition process is crucial for the engineering and practical application of advanced initiator and pyrotechnics devices.In this study,a one-dimensional(1D)gas-solid two-phase flow ignition model was established to study the ignition process of ESCB to charge particles based on the reactivity of Al/MoO_(3) RMFs.In order to fully consider the coupled exothermic between the RMFs and the SCB plasma during the ignition process,the heat release of chemical reaction in RMFs was used as an internal heat source in this model.It is found that the exothermal reaction in RMFs improved the ignition performance of SCB.In the process of plasma rapid condensation with heat release,the product of RMFs enhanced the heat transfer process between the gas phase and the solid charge particle,which accelerated the expansion of hot plasma,and heated the solid charge particle as well as gas phase region with low temperature.In addition,it made up for pressure loss in the gas phase.During the plasma dissipation process,the exothermal chemical reaction in RMFs acted as the main heating source to heat the charge particle,making the surface temperature of the charge particle,gas pressure,and gas temperature rise continuously.This result may yield significant advantages in providing a universal ignition model for miniaturized ignition devices. 展开更多
关键词 Ignition enhancement mechanism 1D gas-solid two-phase flow Al/MoO_(3)reactive multilayered films Semiconductor bridge Miniaturized ignition device
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AN ANALYTIC SOLUTION OF DENSE TWO-PHASE FLOW IN A VERTICAL PIPELINE
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作者 林多敏 蔡树棠 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1990年第12期1095-1103,共9页
According to a mathematical model for dense two-phase flows presented in the previous pape[1],a dense two-phase flow in a vertical pipeline is analytically solved, and the analytic expressions of velocity of each cont... According to a mathematical model for dense two-phase flows presented in the previous pape[1],a dense two-phase flow in a vertical pipeline is analytically solved, and the analytic expressions of velocity of each continuous phase and dispersed phase are respectively derived. The results show that when the drag force between twophasesdepends linearly on their relative velocity, the relative velocity profile in the pipeline coincides with Darcy's law except for the thin layer region near the pipeline wall, and that the theoretical assumptions in the dense two-phase flow theory mentioned are reasonable. 展开更多
关键词 dense two-phase flow vertical pipe two-phase flow two-phase flow analytical solution two-phase flow model application
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Numerical simulation of dense particle-gas two-phase flow using the minimal potential energy principle
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作者 Xiangjun Liu Xuchang Xu Wurong Zhang 《Journal of University of Science and Technology Beijing》 CSCD 2006年第4期301-307,共7页
A simulation method of dense particle-gas two-phase flow has been developed. The binding force is introduced to present the impact of particle clustering and its expression is deduced according to the principle of min... A simulation method of dense particle-gas two-phase flow has been developed. The binding force is introduced to present the impact of particle clustering and its expression is deduced according to the principle of minimal potential energy. The cluster collision, break-up and coalescence models are proposed based on the assumption that the particle cluster are treated as one discrete phase. These models are used to numerically study the two-phase flow field in a circulating fluidized bed (CFB). Detailed results of the cluster structure, cluster size, particle volume fraction, gas velocity, and particle velocity are obtained. The correlation between the simulation results and experimental data justifies that these models and algorithm are reasonable, and can be used to efficiently study the dense particle-gas two-phase flow. 展开更多
关键词 dense particle-gas two-phase flow clusters modeling circulating fluidized bed (CFB) principle of minimal potential energy
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A CLOSED SYSTEM OF EQUATIONS FOR DENSE TWO-PHASE FLOW AND EXPRESSIONS OF SHEARING STRESS OF DISPERSED PHA’E AT A WALL
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作者 林多敏 蔡树棠 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1989年第8期679-687,共9页
Inthis paper, each of the two phases in dense two-phase flow is considered as continuous medium and the fundamental equations for two-phase flow arc described in Eulerian form. The generalized constitutive relation of... Inthis paper, each of the two phases in dense two-phase flow is considered as continuous medium and the fundamental equations for two-phase flow arc described in Eulerian form. The generalized constitutive relation of the Bingham fluid is applied to the dispersed phase with the analysis oj physical mechanism of dense two-phase flow. The shearing stress of dispersed phase at a wall is used to give a boundary condition. Then a mathematical model for dense two-phase flow is obtained. In addition, the expressions of shearing stress of dispersed phase at a wall is derived according to the fundamental model of the friclional collision between dispersed-plutse particles and the wall. 展开更多
关键词 E AT A WALL A CLOSED SYSTEM OF EQUATIONS FOR dense two-phase flow AND EXPRESSIONS OF SHEARING STRESS OF DISPERSED PHA
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Numerical simulation of the gas-solid two-phase flow inside the multi-channel nozzle for the surface nanocrystallization induced by the ultrasonic particulate peening 被引量:1
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作者 ZHANG Yujun,LIANG Yongli and ZHANG Junbao Advanced Technology Division,Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 201900,China 《Baosteel Technical Research》 CAS 2010年第4期3-7,共5页
Using a gas-solid two-phase model(a discrete phase model),the authors investigated the flow field inside the multi-channel nozzle for surface nanocrystallization(SNC)induced by the ultrasonic particulate peening(USPP)... Using a gas-solid two-phase model(a discrete phase model),the authors investigated the flow field inside the multi-channel nozzle for surface nanocrystallization(SNC)induced by the ultrasonic particulate peening(USPP).By computation,the velocity fields of both the gas and the solid phases were simulated and the track of the solid phase was analyzed in detail.It can be found that the velocities of the two phases are able to reach an ultrasonic level;meanwhile,the dispersion width of the solid phase at the nozzle exit is less than that of the gas phase.When particle diameters are less than 5 μm,there is a decreasing trend in the dispersion width of the solid phase with an increase in particle diameters.The trend becomes stable as the particle diameters are greater than 5 μm;in the meantime,the distribution of solid particles is near the axis of the jet flow.The optimal standoff distance between the nozzle and the substrate in the process of USPP is about 120 mm.Simulation results can help improve the design of mass-production-oriented multi-channel nozzles for SNC induced by USPP. 展开更多
关键词 USPP SNC multi-channel nozzle gas-solid two-phase flow numerical simulation
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Numerical Simulation of the Gas-solid Two-phase Flows in a Precalciner 被引量:1
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作者 王家楣 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2006年第4期177-179,共3页
The gas-solid two-phase flous of the precalciner were simulated by different multiphase models,such as mixture model,the Enderium model,including mixture and dispersed,and discrete phase model(DPM),The results of th... The gas-solid two-phase flous of the precalciner were simulated by different multiphase models,such as mixture model,the Enderium model,including mixture and dispersed,and discrete phase model(DPM),The results of the different multiphase models were analyzed and compared.showing the rationality of the diffusion and mixture of the cenment raic meals and coal poroder some extent Moreover,the results also shose the rationality of the given inlets parameters of actual process of the precalciner. 展开更多
关键词 preculciner gas-solid two-phase flow mumerical simulation
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PREDICTIONS OF 3-D STRONGLY SWIRLING GAS-SOLID TWO-PHASE FLOW WITH GAS COMBUSTION
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作者 王振宇 还博文 《Journal of Shanghai Jiaotong university(Science)》 EI 1998年第1期59-63,共5页
PREDICTIONSOF3┐DSTRONGLYSWIRLINGGAS┐SOLIDTWO┐PHASEFLOWWITHGASCOMBUSTIONWangZhenyu(王振宇)(ShanghaiWujingThermal... PREDICTIONSOF3┐DSTRONGLYSWIRLINGGAS┐SOLIDTWO┐PHASEFLOWWITHGASCOMBUSTIONWangZhenyu(王振宇)(ShanghaiWujingThermalPowerPlant)HuanBo... 展开更多
关键词 王振宇 STRONGLY SWIRLING two-phase OF PREDICTIONS flow WITH COMBUSTION gas-solid
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STUDY ON RESISTANCE CHARACTERISTICOF GAS-SOLID DENSE EXTRUSION FLOW
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作者 吴慧英 王文琪 周强泰 《Journal of Southeast University(English Edition)》 EI CAS 1995年第2期22-27,共6页
An experimental study is made on the resistance characteristic ofthe dense extrusion flow with pulverized coal and nitrogen as medium in thispaper. Through the analysis of gas compressibility , solids continuity and l... An experimental study is made on the resistance characteristic ofthe dense extrusion flow with pulverized coal and nitrogen as medium in thispaper. Through the analysis of gas compressibility , solids continuity and lam-mar flow of both gas and solids, a 展开更多
关键词 gas-solid dense EXTRUSION flow COMPRESSIBILITY resistance char-acteristics
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A Numerical Sirnulation of Gas-Particle Two-Phase Flow in a Suspension Bed Using DifFusion Flux Model 被引量:1
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作者 尚智 杨瑞昌 +2 位作者 FUKUDA Kenji 钟勇 巨泽建 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2003年第5期497-503,共7页
A mathematical modei of two-dimensional turbulent gas-particle twophase flow based on the modified diffusion flux modei (DFM) and a numerical simulation method to analyze the gas-particle flow structures are developed... A mathematical modei of two-dimensional turbulent gas-particle twophase flow based on the modified diffusion flux modei (DFM) and a numerical simulation method to analyze the gas-particle flow structures are developed. The modified diffusion flux modei, in which the acceleration due to various forces is taken into account for the calculation of the diffusion velocity of particles, is applicable to the analysis of multi-dimensional gas-particle two-phase turbulent flow. In order to verify its accuracy and efficiency, the numerical simulation by DFM is compared with experimental studies and the prediction by k-ε-kp two-fluid modei, which shows a reasonable agreement. It is confirmed that the modified diffusion flux modei is suitable for simulating the multi-dimensional gas-particle two-phase flow. 展开更多
关键词 diffusion flux model gas-solid two-phase flow turbulent flow numerical simulation
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Near-source characteristics of two-phase gas-solid outbursts in roadways 被引量:1
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作者 Aitao Zhou Meng Zhang +1 位作者 Kai Wang Derek Elsworth 《International Journal of Coal Science & Technology》 EI CAS CSCD 2021年第4期685-696,共12页
Coal and gas outbursts compromise two-phase gas-solid mixtures as they propagate as shock waves and flows from their sources.Propagation is influenced by the form of the outburst,proximity to source,the structure and ... Coal and gas outbursts compromise two-phase gas-solid mixtures as they propagate as shock waves and flows from their sources.Propagation is influenced by the form of the outburst,proximity to source,the structure and form of the transmitting roadways and the influence of obstacles.The following characterizes the propagation of coal and gas outbursts as two-phase gas-solid flows proximal to source where the coupled effects of pulverized coal and gas flows dominate behavior.The characteristics of shock wave propagation and attenuation were systematically examined for varied roadway geometries using experiments and numerical models.The results demonstrate that the geometry of roadway obstructions is significant and may result in partial compression and sometimes secondary overpressurization in blocked and small comer roadways leading to significant attenuation of outburst shock waves.The shock waves attenuate slowly in both straight and abruptly expanding roadways and more significantly in T-shaped roadways.The most significant attenuation appears in small angle comers and bifurcations in roadways with the largest attenuation occurring in blocked roadways.These results provide basic parameters for simplifying transport in complex roadway networks in the far-field,and guidance for the design of coal and gas outburst prevention facilities and emergency rescue. 展开更多
关键词 Coal and gas outburst Proximity to source Shock wave propagation two-phase gas-solid flow Outburst prevention
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Critical Stokes Number for Gas-Solid Flow Erosion of Wind Turbine Airfoil 被引量:3
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作者 Li Deshun Gong Yuxiang +2 位作者 Li Rennian Li Yinran Ma Ruijie 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2016年第1期67-72,共6页
Wind turbine blades are inevitable to be eroded in wind-sand environment,so it is crucial to identify the flow conditions under which the erosion happens.Here,the effect of the sand diameter on wind turbine airfoil is... Wind turbine blades are inevitable to be eroded in wind-sand environment,so it is crucial to identify the flow conditions under which the erosion happens.Here,the effect of the sand diameter on wind turbine airfoil is first investigated.When the sand diameter is less than 3μm,the sands will bypass the airfoil and no erosion occurs.When the sand diameter is larger than 4μm,the sand grains collide with the airfoil and the erosion happens.Thus,there must be a critical sand diameter between 3μm and 4μm,at which the erosion is initiated on the airfoil surface.To find out this critical value,aparticle Stokes number is introduced here.According to the range of the critical sand diameter mentioned above,the critical value of particle Stokes number is reasonably assumed to be between 0.007 8and 0.014.The assumption is subsequently validated by other four factors influecing the erosion,i.e.,the angle of attack,relative thickness of the airfoil,different series airfoil,and inflow velocity.Therefore,the critical range of Stokes number has been confirmed. 展开更多
关键词 wind turbine airfoil erosion critical Stokes number gas-solid two-phase flow
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CFD Simulation of Dilute Gas-Solid Flow in 90<sup>o</sup>Square Bend
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作者 T. A. Mikhail Walid A. Aissa +1 位作者 S. A. Hassanein O. Hamdy 《Energy and Power Engineering》 2011年第3期246-252,共7页
Gas-solid two-phase flow in a 90? bend has been studied numerically. The bend geometry is squared cross section of (0.15 m × 0.15 m) and has a turning radius of 1.5 times the duct's hydraulic diameter. The so... Gas-solid two-phase flow in a 90? bend has been studied numerically. The bend geometry is squared cross section of (0.15 m × 0.15 m) and has a turning radius of 1.5 times the duct's hydraulic diameter. The solid phase consists of glass spheres having mean diameter of 77 μm and the spheres are simulated with an air flowing at bulk velocity of 10 m/s. A computational fluid dynamic code (CFX-TASCflow) has been adopted for the simulation of the flow field inside the piping and for the simulation of the particle trajectories. Simulation was performed using Lagrangian particle-tracking model, taking into account one-way coupling, combined with a particle-wall collision model. Turbulence was predicted using k-ε model, wherein additional transport equations are solved to account for the combined gas-particle interactions and turbulence kinetic energy of the particle phase turbulence. The computational results are compared with the experimental data present in the literature and they were found to yield good agreement with the measured values. 展开更多
关键词 gas-solid two-phase flow DILUTE 90oBend CFX
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Gas-solid flow field numerical simulation of different feeding and returning formations of flue-gas circulating fluidized bed
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作者 WANG Hu 《Journal of Coal Science & Engineering(China)》 2012年第4期407-412,共6页
3D Euler double-fluid model was applied and three different feedstocks and reverts formations were simulated. By calculating and analyzing the state of gas and solid fluxion in absorber using three different methods o... 3D Euler double-fluid model was applied and three different feedstocks and reverts formations were simulated. By calculating and analyzing the state of gas and solid fluxion in absorber using three different methods of the feedstocks and reverts in recirculating fluidized bed, described the behavior of gas and solid through the gas-phase velocity, turbulence intensity, gas-solid sliding velocity, and density of particles. The results show that the feedstocks and reverts enters into absorption tower through two symmetrical feedings and are mixed with flue gas. Based on the respective analysis of each model and the com- parison analysis of the three models, this paper drew conclusions. The turbulence intensity of absorption tower is high, gas-solid sliding speed is big, and granule concentration near the axis is high, which has advantages for desulfurization and im- proving the utilization rate of absorbent. 展开更多
关键词 flue-gas desulfurization feedstocks and reverts gas-solid two-phase flow numerical simulation
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Two-phase turbulence models for simulating dense gas-particle flows 被引量:1
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作者 Lixing Zhou Yong Yu +1 位作者 Feipeng Cai Zhuoxiong Zeng 《Particuology》 SCIE EI CAS CSCD 2014年第5期100-107,共8页
The two-fluid model is widely adopted in simulations of dense gas-particle flows in engineering facili- ties. Present two-phase turbulence models for two-fluid modeling are isotropic. However, turbulence in actual gas... The two-fluid model is widely adopted in simulations of dense gas-particle flows in engineering facili- ties. Present two-phase turbulence models for two-fluid modeling are isotropic. However, turbulence in actual gas-particle flows is not isotropic. Moreover, in these models the two-phase velocity correlation is closed using dimensional analysis, leading to discrepancies between the numerical results, theoretical analysis and experiments. To rectify this problem, some two-phase turbulence models were proposed by the authors and are applied to simulate dense gas-particle flows in downers, risers, and horizontal channels; Experimental results validate the simulation results. Among these models the USM-O and the two-scale USM models are shown to give a better account of both anisotropic particle turbulence and particle-particle collision using the transport equation model for the two-phase velocity correlation. 展开更多
关键词 dense gas-particle flows two-phase turbulence models Anisotropic turbulence
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Transportation characteristics of gas-solid two-phase flow in a long-distance pipeline 被引量:5
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作者 Xiaoqiang Zhang Dongfeng Zhang +1 位作者 An Wang Yide Geng 《Particuology》 SCIE EI CAS CSCD 2015年第4期196-202,共7页
In this study, experiments on fly ash conveying were carried out with a home-made long-distance positive-pressure pneumatic conveying system equipped with a high performance electrical capacitance tomography system to... In this study, experiments on fly ash conveying were carried out with a home-made long-distance positive-pressure pneumatic conveying system equipped with a high performance electrical capacitance tomography system to observe the transient characteristics of gas-solid two-phase flow. The experimen- tal results indicated that solids throughput increased with increasing solids-gas ratio when the conveying pipeline was not plugged. Moreover, the optimum operating state was determined for the 1000 m long conveying pipeline with a throttle plate of 26 orifices. At this state the solids throughput was about 12.97 t/h. Additionally, the transportation pattern of fly ash gradually changed from sparse-dense flow to partial and plug flows with increasing conveying distance because of the conveying pressure loss, These experimental results provide important reference data for the development of pneumatic conveying technology. 展开更多
关键词 Pneumatic conveying Electrical capacitance tomography Fly ash gas-solid two-phase flow Solid concentration
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On the Computations of Gas-Solid Mixture Two-Phase Flow
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作者 D.Zeidan R.Touma 《Advances in Applied Mathematics and Mechanics》 SCIE 2014年第1期49-74,共26页
This paper presents high-resolution computations of a two-phase gas-solid mixture using a well-defined mathematical model.The HLL Riemann solver is applied to solve the Riemann problem for the model equations.This sol... This paper presents high-resolution computations of a two-phase gas-solid mixture using a well-defined mathematical model.The HLL Riemann solver is applied to solve the Riemann problem for the model equations.This solution is then employed in the construction of upwind Godunov methods to solve the general initial-boundary value problem for the two-phase gas-solid mixture.Several representative test cases have been carried out and numerical solutions are provided in comparison with existing numerical results.To demonstrate the robustness,effectiveness and capability of these methods,the model results are compared with reference solutions.In addition to that,these results are compared with the results of other simulations carried out for the same set of test cases using other numerical methods available in the literature.The diverse comparisons demonstrate that both the model equations and the numerical methods are clear in mathematical and physical concepts for two-phase fluid flow problems. 展开更多
关键词 Hyperbolic conservative equations two-phase flows compressible gas-solid mixture conservation laws approximate Riemann solver upwind Godunov methods numerical simulation.
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Effect on the Flow Behaviors by Adding Internals in a Riser Reactor
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作者 Liuhai Feng Yifeng Bu +2 位作者 Juan Wang Yu Mao Zhuowu Men 《Open Journal of Fluid Dynamics》 2017年第1期72-82,共11页
Riser reactor is a key unit in the Fluid Catalytic Cracking (FCC), and it has important influences on increasing the yield coefficient of gas and oil. In this paper, the behaviors of gas-solid two-phase flow in the tr... Riser reactor is a key unit in the Fluid Catalytic Cracking (FCC), and it has important influences on increasing the yield coefficient of gas and oil. In this paper, the behaviors of gas-solid two-phase flow in the traditional y-type riser reactor are investigated by numerical simulation. The calculated particle concentration distribution is in good agreement with the experimental data, which verified the advanced models and calculating methods. The non-uniform distribution, such as core-annulus flow, may result in the unreasonable matching relationship of catalyst-to-oil ratio. An optimized riser with cuneal internals is proposed and the comparison of two different structures of riser reactor is presented. The comparison results show that the cuneal internals in the riser both can block effectively the slip down of the particles near wall region and weaken core-annulus flow structure due to the redistribution of particles. The results also prove that the particle concentration distribution becomes uniform along the axial and radial direction in the optimized riser by adding cuneal internals, which would be benefits for the catalytic cracking reactions. 展开更多
关键词 RISER Reactor gas-solid two-phase flow Core-Annulus flow Structure Numerical Simulation
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Numerical Investigation of Particle Temperature Change in Supersonic Flows
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作者 Ryohei Sakamaki Masaya Suzuki Makoto Yamamoto 《Journal of Chemistry and Chemical Engineering》 2012年第9期825-831,共7页
Gas-particle two-phase flow is a very important consideration in designing various machines. Although a great deal of theoretical, experimental, and numerical research has been carried out, particle motion in a supers... Gas-particle two-phase flow is a very important consideration in designing various machines. Although a great deal of theoretical, experimental, and numerical research has been carried out, particle motion in a supersonic flow has not been sufficiently clarified. Hence, in order to clarify the interactions between flow and particles, the authors consider the characteristics of particle motion, especially at high temperatures. In the present study, the flow of a gas with a diluted particle load is to be simulated in a conventional converging-diverging supersonic nozzle. The turbulent gas flow in the nozzle is computed with the finite difference and RANS (raynolds averaged navier-stokes simulation) methods. The particle motion is simulated in a Lagrangian manner. In addition, taking into account the light particle loading, a weak coupling method is used. Through this investigation, it is shown that the particle velocity increases monotonically from the nozzle throat to the outlet. And it is shown that particles can be accelerated to higher velocities in helium than in nitrogen, and smaller particles tend to attain higher speed and lower static temperature. 展开更多
关键词 gas-solid two-phase flow supersonic flow Euler-Lagrange coupling
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Solid Particles Injection in Gas Turbulent Channel Flow
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作者 Abd Elnaby Kabeel Medhat Elkelawy +1 位作者 Hagar Alm-Eldin Bastawissi Ahmed Mohammed Elbanna 《Energy and Power Engineering》 2016年第12期367-388,共22页
This paper represents a review of the recent researches that investigate the behavior of the gas turbulent flow laden with solid particles. The significant parameters that influence the interactions between the both p... This paper represents a review of the recent researches that investigate the behavior of the gas turbulent flow laden with solid particles. The significant parameters that influence the interactions between the both phases, such as particle size, loading ratio and the gas velocity, have been extensively reviewed. Those parameters are presented in dimensionless numbers in which the applicability of studying its effect in terms of all circumstances of the gas turbulent channel flow at different condition is possible. The represented results show that the turbulence degree is proportional to the particle size. It was found that at the most flow conditions even at low mass ratio, the particle shape, density and size significantly alter the turbulence characteristics. However, the results demonstrate that the particle Reynolds number is a vital sign: the turbulence field becomes weaker if particle Reynolds number is lower than the critical limit and vies verse. The gas velocity has a strong effect on the particles settling along the channel flow and as a result, the pressure drop will be affected. 展开更多
关键词 two-phase flow Particle-Laden flow gas-solid Channel flow Particle Size Effect
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Numerical Simulation of Dense Gas-solid Two Phase Flow in a Steady-state Fluidized Bed
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作者 ZHANG Jian-hui WANG Li-ya +1 位作者 LUO Bi-hui ZHENG Yan-zhen 《Chinese Journal of Biomedical Engineering(English Edition)》 CAS 2021年第1期20-29,共10页
To investigate the influence of the furnace structure and inlet gas velocity on gas-solid two-phase flow states in the deposition furnace,FLUENT software was used to simulate dense gas-solid two-phase flow in a fluidi... To investigate the influence of the furnace structure and inlet gas velocity on gas-solid two-phase flow states in the deposition furnace,FLUENT software was used to simulate dense gas-solid two-phase flow in a fluidized bed.The results show that the dispersed fluidized bed formed in the deposition furnace with a cone angle of 60°has the structure of"ring-nucleus"and longer gas retention time compared with the flat-bottom structure deposition furnace,which is beneficial to the preparation of the pyrolytic carbon coating materials with a uniform structure and excellent quality.Inlet gas velocity should be moderate,the slow inlet gas velocity leads to the chaos of the particle velocity distribution,which cannot form the ring-core flow structure.High inlet gas velocity leads to the back mixing of particles in the deposition furnace.In addition,as the inlet gas velocity increases,both the gas phase and the average particle velocity in the central area of the deposition furnace gradually increase,and the effect of the gas phase velocity is more obvious. 展开更多
关键词 fluidized bed gas-solid two-phase flow states numerical simulation
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