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变压吸附两相流FLUENT模型的建立 被引量:2
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作者 由宏新 陈勇 李慧敏 《现代化工》 CAS CSCD 北大核心 2013年第9期130-135,共6页
利用FLUENT中气-固多孔介质模型可模拟多孔介质内气体的流动规律。针对FLUENT自带的单相多孔介质模型不能表现变压吸附气体与固体吸附颗粒之间的传质、传热问题,采用FLUENT用户自定义函数编程,反映吸附分离传质、传热和动量传递,将多孔... 利用FLUENT中气-固多孔介质模型可模拟多孔介质内气体的流动规律。针对FLUENT自带的单相多孔介质模型不能表现变压吸附气体与固体吸附颗粒之间的传质、传热问题,采用FLUENT用户自定义函数编程,反映吸附分离传质、传热和动量传递,将多孔介质单相模型耦合为更准确的气固两相流模型,并加以验证。结果表明,出口氧气平均摩尔浓度误差在2%左右,模拟与实验结果吻合较好。 展开更多
关键词 变压吸附 FLUENT 多孔介质 气-固两相流模型
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Fluidized-bed chlorination thermodynamics and kinetics of Kenya natural rutile ore 被引量:3
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作者 牛丽萍 张廷安 +2 位作者 倪培远 吕国志 欧阳全胜 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第11期3448-3455,共8页
Natural rutile and gaseous chlorine with carbon as reductant were used to prepare titanium tetrachloride. Thermodynamics and kinetics of chlorination of Kenya natural rutile particles in a batch-type fluidized bed wer... Natural rutile and gaseous chlorine with carbon as reductant were used to prepare titanium tetrachloride. Thermodynamics and kinetics of chlorination of Kenya natural rutile particles in a batch-type fluidized bed were studied at 1173-1273 K. Thermodynamic analysis of this system revealed that the equation of producing CO was dominant at high temperatures. Based on the gas-solid multi-phase reaction theory and a two-phase model for the fluidized bed, the mathematical description for the chlorination reaction of rutile was proposed. The reaction parameters and the average concentration of gaseous chlorine in the emulsion phase were estimated. The average concentration of emulsion phase in the range of fluidized bed was calculated as 0.3 mol/m^3. The results showed that the chlorination of natural rutile proceeded principally in the emulsion phase, and the reaction rate was mainly controlled by the surface reaction. 展开更多
关键词 natural rutile THERMODYNAMICS KINETICS gas-solid reaction fluidized bed two-phase model
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Three-phase flow of submarine gas hydrate pipe transport 被引量:7
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作者 李立 徐海良 杨放琼 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第9期3650-3656,共7页
In the hydraulic transporting process of cutter-suction mining natural gas hydrate, when the temperature-pressure equilibrium of gas hydrate is broken, gas hydrates dissociate into gas. As a result, solid-liquid two-p... In the hydraulic transporting process of cutter-suction mining natural gas hydrate, when the temperature-pressure equilibrium of gas hydrate is broken, gas hydrates dissociate into gas. As a result, solid-liquid two-phase flow(hydrate and water) transforms into gas-solid-liquid three-phase flow(methane, hydrate and water) inside the pipeline. The Euler model and CFD-PBM model were used to simulate gas-solid-liquid three-phase flow. Numerical simulation results show that the gas and solid phase gradually accumulate to the center of the pipe. Flow velocity decreases from center to boundary of the pipe along the radial direction. Comparison of numerical simulation results of two models reveals that the flow state simulated by CFD-PBM model is more uniform than that simulated by Euler model, and the main behavior of the bubble is small bubbles coalescence to large one. Comparison of numerical simulation and experimental investigation shows that the values of flow velocity and gas fraction in CFD-PBM model agree with experimental data better than those in Euler model. The proposed PBM model provides a more accurate and effective way to estimate three-phase flow state of transporting gas hydrate within the submarine pipeline. 展开更多
关键词 gas hydrate pipe transport three-phase flow Euler model CFD-PBM model
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Characteristics of a Flow Transducer Based on Polarized Charge
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作者 张朴 孔力 黄心汉 《Journal of Southeast University(English Edition)》 EI CAS 2001年第2期36-40,共5页
In this paper we analyze the characteristics of a flow transducer based on polarized charge. The effects of the charged particles in pneumatic pipeline on the measurement pipe potential are discussed in detail and the... In this paper we analyze the characteristics of a flow transducer based on polarized charge. The effects of the charged particles in pneumatic pipeline on the measurement pipe potential are discussed in detail and the equivalent circuits of the potential measurement are presented. On this bases, the relationships between mass flowrate and the electrical potential are obtained for different time constants of the measurement circuit. A satisfactory model is presented based on the characteristics of gas solid two phase flow. The linearity of the model is verified by the experiment results. The transducer, which is coaxially connected with the transport pipeline, does not disturb the flow state and has the features of ruggedness and durability, it is especially suitable for industry process control. 展开更多
关键词 polarized charge gas solid two phase flow measurement model
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多维度耦合氮化硅陶瓷轴承粉粒制备效果与制粒结构分析 被引量:2
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作者 吴旭辉 周健震 +3 位作者 张鑫 李军 王海滨 王兴国 《中国陶瓷工业》 CAS 2021年第3期15-19,共5页
针对氮化硅陶瓷轴承粉粒混合不均、分散性差、颗粒成形不规律的问题,提出利用CFD-DEM耦合的数值分析方法构建欧拉-欧拉气-固两相流模型分析气体与粉体的相互作用。采用RNG k-ε模型模拟耦合场制粒室内的湍流状态,探索多维度组合结构对... 针对氮化硅陶瓷轴承粉粒混合不均、分散性差、颗粒成形不规律的问题,提出利用CFD-DEM耦合的数值分析方法构建欧拉-欧拉气-固两相流模型分析气体与粉体的相互作用。采用RNG k-ε模型模拟耦合场制粒室内的湍流状态,探索多维度组合结构对耦合场制粒工艺过程流场的影响。结果表明:当底结构长度为35 mm时,多维度组合结构更有利于粉粒的轴向运动,堆积现象有所减弱,有效改善了打旋现象,制备的氮化硅陶瓷轴承粉粒混合效果更好。所得结论对氮化硅陶瓷轴承粉粒气-固两相流旋转耦合场制粒方法具有一定的指导意义。 展开更多
关键词 氮化硅陶瓷轴承粉粒 制备效果 制粒结构 气-固两相流模型
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Gas Turbulence Modulation Model for Gas-Solid Flows in Two-Fluid Approach 被引量:1
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作者 曾卓雄 潘阳 周力行 《Journal of Shanghai Jiaotong university(Science)》 EI 2010年第4期428-433,共6页
Turbulence enhancement by particle wake effect is studied by numerical simulation of gas turbulent flows passing over particle under various particle sizes, inlet gas velocities, gas viscosity, gas density and the dis... Turbulence enhancement by particle wake effect is studied by numerical simulation of gas turbulent flows passing over particle under various particle sizes, inlet gas velocities, gas viscosity, gas density and the distance of particles. By performing dimension analysis and using the form of gas-particle interaction source term for reference, a new semi-empirical turbulence enhancement model by the particle-wake effect is proposed. The turbulence model is then incorporated into second-order moment model for simulating gas-particle flows in a horizontal channel with different wall roughness and a sudden-expansion chamber. The results show that this model is with higher calculating accuracy than another two turbulence models in comparison with the experimental results. 展开更多
关键词 gas-particle flows turbulence modulation particle wake effect
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