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CFD simulation of bubbling and collapsing characteristics in a gas-solid fluidized bed 被引量:8
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作者 Pei Pei Zhang Kai +1 位作者 Lu Erwei Wen Dongsheng 《Petroleum Science》 SCIE CAS CSCD 2009年第1期69-75,共7页
Computational Fluid Dynamics (CFD) has become an alternative method to experiments for understanding the fluid dynamics of multiphase flow. A two-fluid model, which contains additional terms in both the gas- and sol... Computational Fluid Dynamics (CFD) has become an alternative method to experiments for understanding the fluid dynamics of multiphase flow. A two-fluid model, which contains additional terms in both the gas- and solid-phase momentum equations, is used to investigate the fluidization quality in a fluidized bed. A case study for quartz sand with a density of 2,660 kg/m^3 and a diameter of 500 μm, whose physical property is similar to a new kind of catalyst for producing clean fuels through the residue fluid catalytic cracking process, is simulated in a two-dimensional fluidized bed with 0.57 m width and 1.00 m height. Transient bubbling and collapsing characteristics are numerically investigated in the platform of CFX 4.4 by integrating user-defined Fortran subroutines. The results show that the fluidization and collapse process is in fair agreement with the classical theory of Geldart B classification, but the collapse time is affected by bubbles at the interface between the dense phase and freeboard. 展开更多
关键词 Fluidized bed cfd simulation bubbling and collapsing behaviors
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CFD simulation on the generation of turbidites in deepwater areas: a case study of turbidity current processes in Qiongdongnan Basin, northern South China Sea 被引量:5
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作者 JIANG Tao ZHANG Yingzhao +6 位作者 TANG Sulin ZHANG Daojun ZUO Qianmei LIN Weiren WANG Yahui SUN Hui WANG Bo 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2014年第12期127-137,共11页
Turbidity currents represent a major agent for sediment transport in lakes, seas and oceans. In particu-lar, they formulate the most significant clastic accumulations in the deep sea, which become many of the world's... Turbidity currents represent a major agent for sediment transport in lakes, seas and oceans. In particu-lar, they formulate the most significant clastic accumulations in the deep sea, which become many of the world's most important hydrocarbon reservoirs. Several boreholes in the Qiongdongnan Basin, the north-western South China Sea, have recently revealed turbidity current deposits as significant hydrocarbon res-ervoirs. However, there are some arguments for the potential provenances. To solve this problem, it is es-sential to delineate their sedimentary processes as well as to evaluate their qualities as reservoir. Numerical simulations have been developed rapidly over the last several years, offering insights into turbidity current behaviors, as geologically significant turbidity currents are difficult to directly investigate due to their large scale and often destructive nature. Combined with the interpretation of the turbidity system based on high-resolution 3D seismic data, the paleotophography is acquired via a back-stripping seismic profile integrated with a borehole, i.e., Well A, in the western Qiongdongnan Basin; then a numerical model is built on the basis of this back-stripped profile. After defining the various turbidity current initial boundary conditions, includ-ing grain size, velocity and sediment concentration, the structures and behaviors of turbidity currents are investigated via numerical simulation software ANSYS FLUENT. Finally, the simulated turbidity deposits are compared with the interpreted sedimentary bodies based on 3D seismic data and the potential provenances of the revealed turbidites by Well A are discussed in details. The simulation results indicate that a sedimen-tary body develops far away from its source with an average grain size of 0.1 mm, i.e., sand-size sediment. Taking into account the location and orientation of the simulated seismic line, the consistence between normal forward simulation results and the revealed cores in Well A indicates that the turbidites should have been transported from Vietnam instead of Hainan Island. This interpretation has also been verified by the planar maps of sedimentary systems based on integration of boreholes and seismic data. The identification of the turbidity provenance will benefit the evaluation of extensively distributed submarine fans for hydro-carbon exploration in the deepwater areas. 展开更多
关键词 turbidity current cfd simulation 3D seismic interpretation sedimentary process
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CFD simulation of pressure fluctuation characteristics in the gas-solid fluidized bed:Comparisons with experiments 被引量:3
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作者 Wang Qingcheng Zhang Kai Gu Hongyan 《Petroleum Science》 SCIE CAS CSCD 2011年第2期211-218,共8页
A simple hydrodynamic model based on two-fluid theory, taking into account the effect of discrete particles on both the gas- and solid-phase momentum equations, was used to numerically investigate the pressure fluctua... A simple hydrodynamic model based on two-fluid theory, taking into account the effect of discrete particles on both the gas- and solid-phase momentum equations, was used to numerically investigate the pressure fluctuation characteristics in a gas-solid fluidized bed with the aid of CFX 4.4, a commercial CFD software package, by adding user-defined Fortran subroutines. Numerical simulations together with typical experimental measurements show that pressure fluctuations originate above the distributor when a gas pulse is injected into the fluidized bed. The pressure above the bubble gradually increases due to the presence of a rising bubble. When the bubble passes through the bed surface, the pressure near the bed surface gradually decreases to a lower value. Moreover, the pressure signals in the bubbling fluidized beds show obviously periodic characteristics. The major frequency of pressure fluctuations at the same vertical position is affected slightly by the operating gas velocity, and the amplitude of pressure fluctuations is related to both the operating gas velocity and the vertical height. In this study, the influence of the operating gas velocity on the pressure wave propagation velocity can be ignored, and only two peak frequencies in the power spectrum of the pressure fluctuations are observed which are associated with the bubble formation above the distributor and its eruption at the bed surface. 展开更多
关键词 Gas-solid fluidized bed cfd simulation experimental measurements propagation ofpressure fluctuations pressure wave velocity pressure fluctuation frequency
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Optimal design of heat exchanger header for coal gasification in supercritical water through CFD simulations 被引量:1
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作者 Lei Huang Lin Qi +2 位作者 Hongna Wang Jinli Zhang Xiaoqiang Jia 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2017年第8期1101-1108,共8页
Heat exchangers play an important role in supercritical water coal gasification systems for heating feed and cooling products. However, serious deposition and plugging problems always exist in heat exchangers. CFD mod... Heat exchangers play an important role in supercritical water coal gasification systems for heating feed and cooling products. However, serious deposition and plugging problems always exist in heat exchangers. CFD modeling was used to simulate the transport characteristics of solid particles in supercdtical water through the shell and tube of heat exchangers to alleviate the problems. In this paper, we discuss seven types of exchangers CA, B, C D, E, F and G), which vary in inlet nozzle configuration, header height, inlet pipe diameter and tube pass distribution. In the modeling, the possibility of deposition in the header was evaluated by accumulated mass of particles; we used the velocity contour of supercritical water (SCW) to evaluate the uniformity of the velocity dis- tribution among the tube passes. Simulation results indicated that the optimum heat exchanger had structure F, which had a rectangular configuration of tube pass distractions, a bottom inlet, a 200-mm header height and a 10-ram inlet pipe diameter. 展开更多
关键词 Supercritical water Shell and tube heat exchanger Particle conveying Pneumatic transport cfd simulations CFX
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CFD simulations of quenching process for partial oxidation of methane:Comparison of jet-in-cross-flow and impinging flow configurations
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作者 Xinyu Yu Tianwen Chen +1 位作者 Qi Zhang Tiefeng Wang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第5期903-913,共11页
A new quenching process using the cold pyrolysis gas has been proposed for the partial oxidation(POX) of methane to recover the heat. The mixing of hot product gas and cold pyrolysis gas in milliseconds is critical to... A new quenching process using the cold pyrolysis gas has been proposed for the partial oxidation(POX) of methane to recover the heat. The mixing of hot product gas and cold pyrolysis gas in milliseconds is critical to this new approach. Two most widely-used rapid mixing configurations, i.e. the jet-in-cross-flow(JICF) and impinging flow configurations, are compared in terms of mixing and quenching performances using computational fluid dynamics(CFD) coupled with detailed reaction mechanism Leeds 1.5. The mixedness, residence time distribution, temperature decreasing rate and loss ratio of acetylene during the quenching are systematically studied. The results show that the impinging flow has a more uniform mixing and narrower residence time distribution than the JICF.However, the temperature decreasing rate of the mainstream is faster in the JICF than in the impinging flow. The loss ratio of acetylene in the quenching process is 2.89% for the JICF and 1.45% for the impinging flow, showing that the impinging flow configuration is better and feasible for the quenching of POX of methane. 展开更多
关键词 Jet-in-cross-flow Impinging flow cfd simulations Mixing behavior Quenching of partial oxidation process
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Experimental characterization and CFD simulation of gas maldistribution in turbulent fluidization of Group A particles 被引量:1
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作者 Maurizio Troiano Benjamin Amblard +3 位作者 Sina Tebianian Roberto Solimene Piero Salatino Thierry Gauthier 《Particuology》 SCIE EI CAS CSCD 2023年第11期192-203,共12页
The study presented hereby investigates experimentally and with CFD simulations the gas distribution effect on the hydrodynamic of a Geldart Group A turbulent fluidized bed. Experiments were carried out on a cold flow... The study presented hereby investigates experimentally and with CFD simulations the gas distribution effect on the hydrodynamic of a Geldart Group A turbulent fluidized bed. Experiments were carried out on a cold flow fluidized bed column with an even and uneven gas distribution. Local solid volume fraction profiles were measured using optical probes at different bed heights and along two radial directions. Optical probe measurements allow catching a clear hydrodynamic difference between both even and uneven gas distributions. These results were then used to assess CFD simulations with the code Barracuda^(TM) (MP-PIC approach). It is noteworthy that the choice of drag correlation and boundary conditions strongly influences the agreement between the experimental and CFD results. Once the correct parameters are chosen, CFD simulations captured the effect of gas distribution changes. 展开更多
关键词 Characterization of multiphase reactors Fluidized bed TURBULENT Gas distribution JET Optical probe cfd simulations
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Optimization of Chinese solar greenhouse building parameters based on CFD simulation and entropy weight method
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作者 Fen He Changqing Si +5 位作者 Xiaoming Ding Zhenjun Gao Binbin Gong Fei Qi Yilei Yin Qian Feng 《International Journal of Agricultural and Biological Engineering》 SCIE 2023年第6期48-55,共8页
The building parameters of Chinese solar greenhouse(CSG)directly affect the front roof lighting and indoor thermal environment.In order to obtain the optimal parameter combination,a building parameter optimization met... The building parameters of Chinese solar greenhouse(CSG)directly affect the front roof lighting and indoor thermal environment.In order to obtain the optimal parameter combination,a building parameter optimization method based on computational fluid dynamics(CFD)simulation and entropy weight method was proposed.Firstly,a three-dimensional thermal and humidity environment model of CSG was constructed considering the coupling effect of soil,crop,and back wall based on CFD.The reliability of the model was validated through experiments in a CSG of Yongqing County,Hebei Province of China.Then,the indoor air temperature rise rate,air temperature and humidity uneven coefficient,and average air temperature and humidity were selected as the evaluation indicators of CSG thermal and humidity environment.The ridge height,back wall height and the horizontal projection of back roof of CSG were selected as the three factors of the orthogonal test plan,and a three-factor and four-level plan was designed,resulting in 16 different parameter combinations.By use of CFD simulation,the thermal and humidity environment evaluation indicators under different parameter combinations were calculated.The entropy weight method was used to assign weights to the evaluation indicators,and the comprehensive evaluation indicators of CSG thermal and humidity environment were obtained based on the linear weighting principle.By comparing comprehensive evaluation indicators,the optimal combination of building parameters was obtained with a ridge height of 5.72 m,a back wall height of 3.2 m,and a horizontal projection of 2.1 m on the back roof.The research results can provide a practical and feasible method for optimizing the building parameters of CSG,and provided theoretical guidance for the structural design and optimization of CSG. 展开更多
关键词 CSG thermal and humidity environment cfd simulation entropy weight method building parameter optimization
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Simulation of liquid cone formation on the tip apex of indium field emission electric propulsion thrusters
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作者 孙逸鸣 邓涵文 +1 位作者 刘欣宇 康小明 《Plasma Science and Technology》 SCIE EI CAS CSCD 2024年第4期146-155,共10页
Field emission electric propulsion(FEEP) thrusters possess excellent characteristics, such as high specific impulse, low power requirements, compact size and precise pointing capabilities,making them ideal propulsion ... Field emission electric propulsion(FEEP) thrusters possess excellent characteristics, such as high specific impulse, low power requirements, compact size and precise pointing capabilities,making them ideal propulsion devices for micro-nano satellites. However, the detection of certain aspects, such as the evolution process of the liquid cone and the physical quantities at the cone apex, proves challenging due to the minute size of the needle tip and the vacuum environment in which they operate. Consequently, this paper introduces a computational fluid dynamics(CFD) model to gain insight into the formation process of the liquid cone on the tip apex of indium FEEP. The CFD model is based on electrohydrodynamic(EHD) equations and the volume of fluid(VOF) method. The entire cone formation process can be divided into three stages, and the time-dependent characteristics of the physical quantities at the cone apex are investigated. The influences of film thickness, apex radius size and applied voltage are compared.The results indicate a gradual increase in the values of electrostatic stress and surface tension stress at the cone apex over an initial period, followed by a rapid escalation within a short duration.Apex configurations featuring a small radius, thick film and high voltage exhibit a propensity for liquid cone formation, and the cone growth time decreases as the film thickness increases.Moreover, some unstable behavior is observed during the cone formation process. 展开更多
关键词 FEEP needle emitter liquid cone formation cfd simulation
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Selection of the Relevant Turbulence Model in a CFD Simulation of a Flow Disturbed by Hydraulic Elbow--Comparative Analysis of the Simulation with Measurements Results Obtained by the Ultrasonic Flowmeter 被引量:7
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作者 PIECHOTA Piotr SYNOWIEC Piotr +1 位作者 ANDRUSZKIEWICZ Artur WEDRYCHOWICZ Wieslaw 《Journal of Thermal Science》 SCIE EI CAS CSCD 2018年第5期413-420,共8页
The article is an attempt to compile the results of CFD liquid flow simulation through pipeline section containing hydraulic elbow with the results of ultrasonic flow measurements. To carry out the measurements behind... The article is an attempt to compile the results of CFD liquid flow simulation through pipeline section containing hydraulic elbow with the results of ultrasonic flow measurements. To carry out the measurements behind the flow disturbing element(hydraulic elbow), an ultrasonic flowmeter with applied head set in accordance with the Z-type system was used. For comparative purposes, a flow simulation for 3 different turbulence models(k-epsilon, SST and SSG) was performed. It was found that with a proper ultrasonic flowmeter heads configurations, it is possible to measure the flow rate disturbed by the hydraulic elbow at any distance from the source of the disturbance. It has to use appropriate correction factor that can be determined by knowing the flow velocity profile equation. Based on comparison of CFD simulation results with experimental data, the accuracy/purposefulness of using individual turbulence models in the case of discussed hydraulic installation was evaluated. 展开更多
关键词 ultrasonic flowmeter turbulent flow turbulence models cfd simulation measurement error
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CFD simulation of particle suspension in a stirred tank 被引量:22
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作者 Nana Qi Hu Zhang +2 位作者 Kai Zhang Gang Xu Yongping Yang 《Particuology》 SCIE EI CAS CSCD 2013年第3期317-326,共10页
Particle suspension characteristics are predicted computationally in a stirred tank driven by a Smith turbine. In order to verify the hydrodynamic model and numerical method, the predicted power number and flow patter... Particle suspension characteristics are predicted computationally in a stirred tank driven by a Smith turbine. In order to verify the hydrodynamic model and numerical method, the predicted power number and flow pattern are compared with designed values and simulated results from the literature, respectively. The effects of particle density, particle diameter, liquid viscosity and initial solid loading on particle suspension behavior are investigated by using the Eulerian-Eulerian two-fluid model and the standard k-ε turbulence model. The results indicate that solid concentration distribution depends on the flow field in the stirred tank. Higher particle density or larger particle size results in less homogenous distribution of solid particles in the tank. Increasing initial solid loading has an adverse impact on the homogeneous suspension of solid particles in a low-viscosity liquid, whilst more uniform particle distribution is found in a high-viscosity liquid. 展开更多
关键词 Stirred tank Smith turbine Particle suspension cfd simulation
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CFD gas–liquid simulation of oriented valve tray 被引量:2
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作者 马玉凤 纪利俊 +4 位作者 张杰旭 陈葵 武斌 吴艳阳 朱家文 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第10期1603-1609,共7页
Computational fluid dynamics(CFD) has recently emerged as an effective tool for the investigation of the hydraulic parameters and efficiency of tray towers.The computation domain was established for two types of orien... Computational fluid dynamics(CFD) has recently emerged as an effective tool for the investigation of the hydraulic parameters and efficiency of tray towers.The computation domain was established for two types of oriented valves within a tray and meshed into two parts with different grid types and sizes.The volume fraction correlation concerning inter-phase momentum transfer source was fitted based on experimental data,and built in UDF for simulation.The flow pattern of oriented valve tray under different operating conditions was simulated under Eulerian-Eulerian framework with realizable k-ε model.The predicted liquid height from CFD simulation was in good agreement with the results of pressure drop and volume fraction correlations.Meanwhile,the velocity distribution and volume fraction of the two phases were demonstrated and analyzed,which are useful in design and analysis of the column trays. 展开更多
关键词 cfd simulation Oriented valve tray Gas–liquid flow Volume fraction correlation
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CFD simulation of wind and thermal-induced ventilation flow of a roof cavity 被引量:2
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作者 Wei Li Alison Subiantoro +1 位作者 Ian McClew Rajnish NSharma 《Building Simulation》 SCIE EI CSCD 2022年第9期1611-1627,共17页
The hygrothermal performance of a ventilated roof cavity is greatly affected by the airflow passing through it.This ventilation flow is mainly driven by the wind pressure difference between openings and the thermal-in... The hygrothermal performance of a ventilated roof cavity is greatly affected by the airflow passing through it.This ventilation flow is mainly driven by the wind pressure difference between openings and the thermal-induced buoyancy.However,the wind effect is not well understood as it is often neglected in previous studies.The present study investigates the properties of such airflows,including the flow pattern,flow regime,and flow rate,using a CFD method.The target building is a large-span commercial building with a low-pitched roof.To study the wind-induced airflows,the onset atmospheric boundary layer wind flow was modelled,and the results were compared with the site-measured data recorded in the literature.To study the thermal-induced buoyancy effects,a roof cavity model found in the literature with experimental data was adopted.The findings show that the flow pattern in the roof cavity varied with the airflow driven factors.The flow separation at the windward eave inlet of the thermally induced flows are more pronounced compared with those of the wind-induced flows.Furthermore,the wind-induced airflows can generate around two times more ventilation flow rate through the roof cavity compared to the thermal-induced airflow.The findings indicate that wind-induced ventilation flows are the dominant factor of the roof cavity ventilation in a large-span,low-pitched building. 展开更多
关键词 ventilated roof cavity cfd simulation atmospheric boundary layer thermal-induced buoyancy
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CFD simulation and experiment on the flow field of air-assisted ultra-low-volume sprayers in facilities 被引量:1
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作者 Xinyu Lu Yan Gong +4 位作者 Dejiang Liu Guo Wang Xiao Chen Xiao Zhang Qiuhan Liang 《International Journal of Agricultural and Biological Engineering》 SCIE EI CAS 2021年第2期26-34,共9页
In order to explore the performance of the B-ULV-616A knapsack sprayer,computational fluid dynamics(CFD)was used to simulate the B-ULV-616A knapsack air-assisted device,which features an ultra-low-volume electric spra... In order to explore the performance of the B-ULV-616A knapsack sprayer,computational fluid dynamics(CFD)was used to simulate the B-ULV-616A knapsack air-assisted device,which features an ultra-low-volume electric sprayer.Field experiments were carried out to test the spraying effects,and the KANOMAX anemometer was used to verify the simulated results.First,the internal and external flow fields and droplet deposition distribution of the ultra-low-volume sprayer were established.The results showed that the air-assisted spray device can change the airflow speed and direction and produce a high-speed swirling airflow at the outlet of the air-assisted spray device.The high-speed airflow(maximum of 83.5 m/s)generates negative pressure(minimum of 0.099 MPa)and causes a rapid increase in the droplet velocity and a secondary droplets spray,allowing droplets to reach a longer distance.Then,the maximum relative error was 20.14%,and its average value was 9.59%,indicating that the CFD method is suitable for the flow field analysis of the air-assisted spray device.Finally,based on the greenhouse experiment,the knapsack air-assisted ultra-low-volume electric sprayer was found to effectively improve the deposition on the rear of the crop,increase the droplet density(maximum of 81/cm2;droplet density of conventional electric sprayer is 64/cm2),and reduce the deposition amount and coefficient of variation(below 20%)within and between regions.Further,it managed to reduce pesticide use(by 69.85%)and rural non-point source pollution. 展开更多
关键词 cfd simulation air-assisted sprayer ultra-low spraying rate DEPOSITION air-velocity field relative error
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Comprehensive evaluation of combining CFD simulation and entropy weight to predict natural ventilation strategy in a sliding cover solar greenhouse 被引量:1
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作者 He Li Dong Ji +3 位作者 Xi Hu Tian Xie Weitang Song Subo Tian 《International Journal of Agricultural and Biological Engineering》 SCIE EI CAS 2021年第6期213-221,共9页
This study proposed a comprehensive evaluation system to incorporate the contribution of both numerical simulation and statistical decision theory in ventilation performance assessment.A high-resolution model based on... This study proposed a comprehensive evaluation system to incorporate the contribution of both numerical simulation and statistical decision theory in ventilation performance assessment.A high-resolution model based on the finite volume approach was established to analyze the influence of rotation angles(i.e.,side vent flip angle and roof vent flip angle)of the rack-and-pinion ventilated structure on the greenhouse microclimate.The water circulating system and tomato seeding canopies were considered.Heat removal efficiency and mean age of air were employed as quantitative attributes to reflect the internal thermal environment and the airflow organization in the sliding cover solar greenhouse.The simulation model was verified with the temperature profile measured and the average relative error was 1.74%.The results demonstrate that the rotating angles of ventilation schemes have a substantial impact on the microclimate and inhomogeneity of the tomato seeding canopies.The results suggest the average velocity and its inhomogeneity are the crucial predictors,and their entropy weight values are 0.231 and 0.218,respectively.The relative degree of membership of the side vent flip angle of 45°is 36%and 97%higher than that of the side vent flip angle of 35°and the side vent flip angle of 25°,respectively.This study can provide a reference to evaluate the ventilated strategies of the sliding cover solar greenhouse for the regional and central government. 展开更多
关键词 sliding cover solar greenhouse natural ventilation cfd simulation entropy weight comprehensive evaluation
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Combustion mechanism development and CFD simulation for the prediction of soot emission during flaring 被引量:1
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作者 Anan Wang Helen H. Lou +6 位作者 Daniel Chen Anfeng Yu Wenyi Dang Xianchang Li Christopher Martin Vijaya Damodara Ajit Patki 《Frontiers of Chemical Science and Engineering》 SCIE EI CAS CSCD 2016年第4期459-471,共13页
Industrial Flares are important safety devices to bum off the unwanted gas during process startup, shutdown, or upset. However, flaring, especially the associated smoke, is a symbol of emissions from refineries, oil g... Industrial Flares are important safety devices to bum off the unwanted gas during process startup, shutdown, or upset. However, flaring, especially the associated smoke, is a symbol of emissions from refineries, oil gas fields, and chemical processing plants. How to simultaneously achieve high combustion efficiency (CE) and low soot emission is an important issue. Soot emissions are influenced by many factors. Flare operators tend to over-steam or over-air to suppress smoke, which results in low CE. How to achieve optimal flare performance remains a question to the industry and the regulatory agencies. In this paper, regulations in the US regarding flaring were reviewed. In order to determine the optimal operating window for the flare, different combus- tion mechanisms related to soot emissions were summar- ized. A new combustion mechanism (Vsoot) for predicting soot emissions was developed and validated against experimental data. Computational fluid dynamic (CFD) models combined with Vsoot combustion mechanism were developed to simulate the flaring events. It was observed that simulation results agree well with experimental data. 展开更多
关键词 FLARE soot emission combustion mechanism cfd simulation
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CFD analysis of a CiADS fuel assembly during the steam generator tube rupture accident based on the LBEsteamEulerFoam 被引量:1
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作者 Yun-Xiang Li Lu Meng +8 位作者 Song Li Zi-Nan Huang Di-Si Wang Bo Liu You-Peng Zhang Tian-Ji Peng Lu Zhang Xing-Kang Su Wei Jiang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2023年第10期136-147,共12页
Steam generator tube rupture(SGTR) accident is an important scenario needed to be considered in the safety analysis of lead-based fast reactors. When the steam generator tube breaks close to the main pump, water vapor... Steam generator tube rupture(SGTR) accident is an important scenario needed to be considered in the safety analysis of lead-based fast reactors. When the steam generator tube breaks close to the main pump, water vapor will enter the reactor core, resulting in a two-phase flow of heavy liquid metal and water vapor in fuel assemblies. The thermal-hydraulic problems caused by the SGTR accident may seriously threaten reactor core's safety performance. In this paper, the open-source CFD calculation software OpenFOAM was used to encapsulate the improved Euler method into the self-developed solver LBEsteamEulerFoam. By changing different heating boundary conditions and inlet coolant types, the two-phase flow in the fuel assembly with different inlet gas content was simulated under various accident conditions. The calculation results show that the water vapor may accumulate in edge and corner channels. With the increase in inlet water vapor content, outlet coolant velocity increases gradually. When the inlet water vapor content is more than 15%, the outlet coolant temperature rises sharply with strong temperature fluctuation. When the inlet water vapor content is in the range of 5–20%, the upper part of the fuel assembly will gradually accumulate to form large bubbles. Compared with the VOF method, Euler method has higher computational efficiency. However, Euler method may cause an underestimation of the void fraction, so it still needs to be calibrated with future experimental data of the two-phase flow in fuel assembly. 展开更多
关键词 Steam generator tube rupture CiADS cfd simulations Two-phase flow
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Numerical simulation of coupling heat transfer and thermal stress for spent fuel dry storage cask with different power distribution and tilt angles 被引量:1
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作者 Wei‑Hao Ji Jian‑Jie Cheng +1 位作者 Han‑Zhong Tao Wei Li 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2023年第2期109-127,共19页
Dry storage containers must be secured and reliable during long-term storage,and the effect of decay heat released from the internal spent fuel on the cask has become an important research topic.In this paper,a 3D com... Dry storage containers must be secured and reliable during long-term storage,and the effect of decay heat released from the internal spent fuel on the cask has become an important research topic.In this paper,a 3D computational fluid dynamics model is presented,and the accuracy of the calculation is verified,with computational errors of less than 6.2%.The thermal stress of the dry storage cask was estimated by coupling it with a transient temperature field.The total power remained constant and adjusting the power ratio of the inner and outer zones had a small effect on the stress results,with a maximum equivalent stress of approximately 5.2 kPa,which occurred at the lower edge of the shell.In the case of tilt,the temperature gradient varied in a wavy distribution,and the wave crest moved from right to left.Altering the tilt angle affects the air distribution in the annular gap,leading to the shell temperature being transformed,with a maximum equivalent stress of 202 MPa at the bottom of the shell.However,the equivalent stress in both cases was less than the yield stress(205 MPa). 展开更多
关键词 Thermal stress cfd simulation Spent nuclear fuel Dry storage cask
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CFD-Based Numerical Simulation of Water Film Flash Evaporation with a New Flash Evaporation Model
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作者 Siyuan Zhao Yong Liu +1 位作者 Yanjun Liu Ping Na 《Transactions of Tianjin University》 EI CAS 2018年第6期563-570,共8页
In this study, a new mass model involving superheat, initial temperature, liquid height, evaporator diameter, and flashing time is established to describe the flash evaporation process of water film. Of 469 sets of fl... In this study, a new mass model involving superheat, initial temperature, liquid height, evaporator diameter, and flashing time is established to describe the flash evaporation process of water film. Of 469 sets of flash experimental data from three previous researches, 305 sets were applied to optimize parameters, and the other 164 sets were used to verify the practicability of the model. The results showed that the mean relative error between the literature data and the model values was less than 16.3%, and the model statistics proved that the model was well-posed. Then, the kinetic model was obtained using the time derivative of the new mass model. Computational fluid dynamics simulation of water film flash evaporation was studied based on a user-defined function program of the new evaporation kinetic model. The new kinetic model shows more consistency with the experimental phenomena in terms of evaporated mass and temperature compared with the evaporation–condensation model in Fluent software and Gopalakrishna's model. This new kinetic model can be extended to describe the flash process of water solution under other conditions. 展开更多
关键词 Flash evaporation Evaporation model Well-posedness analysis cfd simulation
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CFD Analysis of Spiral Flow Fields in Proton Exchange Membrane Fuel Cells
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作者 Jian Yao Fayi Yan Xuejian Pei 《Fluid Dynamics & Materials Processing》 EI 2023年第6期1425-1445,共21页
Proton exchange membrane fuel cells(PEMFCs)are largely used in various applications because of their pollution-free products and high energy conversion efficiency.In order to improve the related design,in the present ... Proton exchange membrane fuel cells(PEMFCs)are largely used in various applications because of their pollution-free products and high energy conversion efficiency.In order to improve the related design,in the present work a new spiral flow field with a bypass is proposed.The reaction gas enters the flow field in the central path and diffuses in two directions through the flow channel and the bypass.The bypasses are arranged incrementally.The number of bypasses and the cross-section size of the bypasses are varied parametrically while a single-cell model of the PEMFC is used.The influence of the concentration of liquid water and oxygen in the cell on the performance of different flow fields is determined by means of Computational fluid dynamics(COMSOL Multiphysics software).Results show that when the bypass number is 48 and its cross-sectional area is 0.5 mm^(2),the cell exhibits the best performances. 展开更多
关键词 Proton exchange membrane fuel cells(PEMFCs) new spiral flow field square plate cfd simulation analysis
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COMPUTATIONAL FLUID DYNAMICS(CFD) SIMULATIONS OF DRAG REDUCTION WITH PERIODIC MICRO-STRUCTURED WALL 被引量:4
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作者 LI Gang ZHOU Ming +2 位作者 WU Bo YE Xia CAI Lan 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2008年第2期77-80,共4页
Computational fluid dynamics(CFD) simulations are adopted to investigate rectangular microchannel flows with various periodic micro-structured wall by introducing velocity slip boundary condition at low Reynolds num... Computational fluid dynamics(CFD) simulations are adopted to investigate rectangular microchannel flows with various periodic micro-structured wall by introducing velocity slip boundary condition at low Reynolds number. The purpose of the current study is to numerically find out the effects of periodic micro-structured wall on the flow resistance in rectangular microchannel with the different spacings between microridges ranging from 15 to 60 pm. The simulative results indicate that pressure drop with different spacing between microridges increases linearly with flow velocity and decreases monotonically with slip velocity; Pressure drop reduction also increases with the spacing between microridges at the same condition of slip velocity and flow velocity. The results of numerical simulation are compared with theoretical predictions and experimental results in the literatures. It is found that there is qualitative agreement between them. 展开更多
关键词 Reynoids numbers Slip velocity Drag reduction Computational fluid dynamics(cfd simulations
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