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循环流化床内颗粒运动的预测与测量
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作者 岑可法 樊建人 +2 位作者 骆仲泱 严建华 倪明江 《化学反应工程与工艺》 CAS CSCD 北大核心 1989年第4期24-31,共8页
本文提出了一种二维气固流动的数值计算模型,它考虑了循环流化床中颗粒的脉动和颗粒间碰撞等因素。该模型将颗粒运动的脉动考虑成—种基于气流脉动频谱的随机 Fourier 级数,称为脉动频谱随机轨道模型(FSRT)。这一模型可用于预测循环床... 本文提出了一种二维气固流动的数值计算模型,它考虑了循环流化床中颗粒的脉动和颗粒间碰撞等因素。该模型将颗粒运动的脉动考虑成—种基于气流脉动频谱的随机 Fourier 级数,称为脉动频谱随机轨道模型(FSRT)。这一模型可用于预测循环床中颗粒相的速度、颗粒轨迹和颗粒相浓度。对循环床中颗粒相速度和浓度进行了测量,并与 FSRT 模型的计算结果进行对比,同时对循环床中颗粒运动的一些行为也进行了预测。 展开更多
关键词 预测 FSRT模型 气固两相流 测量 颗粒运行 循环流化床
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偏移速度对旋风分离器内饲草颗粒轨迹影响的模拟 被引量:1
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作者 李春阳 《黑龙江农业科学》 2011年第9期136-138,共3页
在农业应用中,饲草的干燥分离经常会用到旋风分离器,由于饲草颗粒的运动方向及速度都会对它的轨迹产生影响,进而影响分离及干燥的效率。为此,根据旋风分离器的工作原理,通过介绍离散相颗粒模型,气固两相流中固体颗粒的受力分析,最后基于... 在农业应用中,饲草的干燥分离经常会用到旋风分离器,由于饲草颗粒的运动方向及速度都会对它的轨迹产生影响,进而影响分离及干燥的效率。为此,根据旋风分离器的工作原理,通过介绍离散相颗粒模型,气固两相流中固体颗粒的受力分析,最后基于fluent模拟,分析偏移速度对饲草颗粒运动轨迹的影响。结果表明偏移速度的改变对稀相固体颗粒运行轨迹的影响不大。模拟的结果起到避免陷入研究误区的作用,对农业中饲草的干燥及分离具有一定的指导和借鉴意义。 展开更多
关键词 旋风分离器 偏移速度 饲草颗粒运行轨迹
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沉流式滤筒除尘器气固两相流动的数值模拟与分析 被引量:24
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作者 顾正萌 郭烈锦 高晖 《化工机械》 CAS 2002年第4期197-202,共6页
为掌握滤筒除尘器内部流动特征 ,应用FLUENT 5 .4 .8软件对DFT3 12型滤筒除尘器内部紊流气固两相流动进行了数值模拟 ,采用k ε紊流模型和壁面函数法模拟气相流动 ,采用双向耦合拉格朗日法追踪颗粒运动轨迹。对连续相速度和压力分布特... 为掌握滤筒除尘器内部流动特征 ,应用FLUENT 5 .4 .8软件对DFT3 12型滤筒除尘器内部紊流气固两相流动进行了数值模拟 ,采用k ε紊流模型和壁面函数法模拟气相流动 ,采用双向耦合拉格朗日法追踪颗粒运动轨迹。对连续相速度和压力分布特征以及颗粒相运动轨迹进行了分析 ,得出了不同工况条件下的系统阻力和颗粒沉积量分布规律 ,对比分析了重力。 展开更多
关键词 沉流式滤筒除尘器 气固两相流 数值模拟 颗粒运行 双向耦合拉格朗日法
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公路雪害防治的指导思想、基本原则和技术
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作者 崔巍 陈亮 徐亮 《黑龙江交通科技》 2006年第6期42-42,共1页
关键词 公路雪害 防治 技术 颗粒运行 风雪流 风吹雪 道路 雪阻
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宇瞻全新黑豹系列笔记本电脑内存条上市
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《计算机应用文摘》 2009年第26期66-66,共1页
宇瞻黑豹金品系列笔记本电脑内存条搭配高散热效率镜面铝材质的超薄型内存散热片,可提供内存条更大的散热面积,有效地将内存颗粒运行所产生的热能快速传导至散热片表面排出,不仅大幅提升内存条效能,更能确保系统的稳定性。超薄型内... 宇瞻黑豹金品系列笔记本电脑内存条搭配高散热效率镜面铝材质的超薄型内存散热片,可提供内存条更大的散热面积,有效地将内存颗粒运行所产生的热能快速传导至散热片表面排出,不仅大幅提升内存条效能,更能确保系统的稳定性。超薄型内存条散热片厚度只有0.3mm,完全符合笔记本电脑狭小空间的设计,不会出现任何兼容问题。 展开更多
关键词 笔记本电脑 内存条 黑豹 内存散热片 上市 散热效率 散热面积 颗粒运行
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Motion behavior of particles in air-solid magnetically stabilized fluidized beds for separation 被引量:13
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作者 Song Shulei a,,Zhao Yuemin a,Luo Zhenfu a,Tang Ligang b a School of Chemical Engineering and Technology,China University of Mining & Technology,Xuzhou 221116,China b Coal Mining and Designing Department,Tiandi Science & Technology Company Co.Ltd.,Beijing 100013,China 《International Journal of Mining Science and Technology》 SCIE EI 2012年第5期725-729,共5页
In order to study the settling mechanism of particles in an air-solid magnetically stabilized fluidized bed(MSFB) for separation,we carried out free settling and quasi-zero settling tests on the tracing particles.The ... In order to study the settling mechanism of particles in an air-solid magnetically stabilized fluidized bed(MSFB) for separation,we carried out free settling and quasi-zero settling tests on the tracing particles.The results show that the main resistance forces as the tracing particles settled in an air-solid MSFB were motion resistance force and yield force.The motion resistance and yield forces greatly hindered the free settling of the particles by greatly decreasing the acceleration for settling process of the particles.The acceleration decreased from 3022.62 cm/s 2 to zero in 0.1 s,and in the end,the particles stopped in the air-solid MSFB.The yield force on particles increased with increasing the magnetic field intensity,resulting in decrease of the quasi-zero settling displacement.However,the yield force on particles decreased with increasing the fluidized air velocity,leading to increase of the quasi-zero settling displacement.When the structure and operating parameters of the air-solid MSFB were set up,the yield stress on particles stopped in an air-solid MSFB was a function of diameter and density of particles.The settling displacements of equal diameter particles increased with increasing their densities,and the settling displacements of equal density particles increased with increasing their diameters. 展开更多
关键词 Air-solid MSFB Free settling Quasi-zero velocity settling Motion of particles
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Structural Optimization of a Novel Up-run Gas-solid Separator
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作者 Gai Xikun1 Tian Yuanyu2 +2 位作者 Xia Daohong1 Qiao Yingyun2(1.China University of Petroleum(East China),Qingdao 266555 2.Shandong University of Science and Technology,Qingdao 266510) 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2011年第2期36-42,共7页
A new gas-solid separator dedicated to heavy-oil fast pyrolysis process incorporating inertial and centrifugal separation was designed. Gas and typical fluid catalytic cracking (FCC) catalyst particles (with a dens... A new gas-solid separator dedicated to heavy-oil fast pyrolysis process incorporating inertial and centrifugal separation was designed. Gas and typical fluid catalytic cracking (FCC) catalyst particles (with a density of 1500 kg/m3, and a mean diameter of 45.81 p.m) were used in the study. The inlet gas velocity was kept constant at 13.36 m/s, while the solid loading at the inlet ranged from 0 to 700 g/m3. When the exhaust pipe opening was provided with two narrow-width slots near the inlet without baffles, the solid collection efficiency increased with an increasing solid loading at the inlet and was close to 95% along with a decreasing pressure drop. After increasing the secondary separation structure, the separation efficiency greatly improved. By adjusting the diameter of the secondary exhaust pipe, the separation efficiency and pressure drop could be balanced. Under the experimental conditions, when the diameter of the second exhaust pipe was equal to d=100 mm, the pressure drop was lower than 1400 Pa while the separation efficiency could exceed 99.50%; and when the diameter was equal to d=120 mm, the pressure drop was less than 700 Pa, with the separation efficiency reaching over 99.00%. 展开更多
关键词 gas-solid separation separation efficiency pressure drop cyclone separators
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