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BUBBLE CHARACTERISTICS IN A TWO-DIMENSIONAL VERTICALLY VIBRO-FLUIDIZED BED

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China Particuology 2005年第4期3卷 224-228页

作者： Tao Zhou hiroyuki kage Hongzhong Li College of Chemistry & Chemical Engineering Central South UniversityChangsha 410083 P. R. China Department of Applied Chemistry Kyushu Institute of Technology Kitakyushu 804-8550 Japan Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 P R. China

Measurement of bubble size and local average bubble rise velocity was carried out in a vertically sinusoidal vibre-fluidized bed. Glass beads of Geldart group B particles were fluidized at different gas velocities, while the bed was vibrated at different frequencies and amplitudes to study their effects on the bubble behavior. This is compared with the case of no vibration in a two-dimensional bed and it is concluded that with vibration the local average bubble size dbav, decreases significantly, especially at minimum bubbling velocity. The average bubble size increases slightly with increasing vibration frequency and amplitude. The local average bubble rise velocity is higher than that with no vibration, though with increasing vibration frequency and amplitude, it does not change significantly.

关键词： bubble size vibro-fluidized bed bubble size distribution measurement of bubble

磁场协助流化床中非磁性纳米颗粒聚团大小的估算

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磁场协助流化床中非磁性纳米颗粒聚团大小的估算

中国颗粒学会第七届学术年会暨海峡两岸颗粒技术研讨会

作者：章锋周涛 hiroyuki kage Yoshihide Mawatari 中南大学化学化工学院 Department of Applied Chemistry Kyushu Institute of Technology1-1Sensui-choTobataKitakyushu804-8550Japan

在内径50 mm的磁场流化床中,测量了纳米级SiO、TiO和ZnO的聚团尺寸。根据纳米颗粒聚团在磁场流化床中碰撞能、磁场能、剪切能和黏性能的平衡分析,建立了估算聚团大小的能量平衡模型。结果表明:通过此模型计算得到的聚团大小与床层流化... 详细信息

在内径50 mm的磁场流化床中,测量了纳米级SiO、TiO和ZnO的聚团尺寸。根据纳米颗粒聚团在磁场流化床中碰撞能、磁场能、剪切能和黏性能的平衡分析,建立了估算聚团大小的能量平衡模型。结果表明:通过此模型计算得到的聚团大小与床层流化后实测的聚团尺寸有很好的一致性。

关键词：纳米颗粒磁场流化床聚团大小能量模型

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振动流化床中纳米颗粒聚团大小的能量模型

振动流化床中纳米颗粒聚团大小的能量模型

Numerical Study of Shock Waves Propagating through Right Angled Multiple Elbows

中国颗粒学会第七届学术年会暨海峡两岸颗粒技术研讨会

作者：王辉周涛桂颖 hiroyuki kage Yoshihide Mawatari 中南大学化学化工学院 Department of Applied Chemistry Kyushu Institute of Technology1-1Sensui-choTobataKitakyushu804-8550Japan

根据纳来颗粒聚团在振动流化床中碰撞能、有效振动能、剪切能和黏性能的平衡分析,建立了估算聚团大小的能量平衡模型。在振动流化床中,测量了纳米级SiO、TiO和ZnO的聚团尺寸。结果表明:振动能的引入可以有效的消除节涌、抑制沟流、降低... 详细信息

根据纳来颗粒聚团在振动流化床中碰撞能、有效振动能、剪切能和黏性能的平衡分析,建立了估算聚团大小的能量平衡模型。在振动流化床中,测量了纳米级SiO、TiO和ZnO的聚团尺寸。结果表明:振动能的引入可以有效的消除节涌、抑制沟流、降低最小流化速度、减小聚团尺寸,显著地改善了纳米颗粒的流化质量。随着振动强度的加大,聚团尺寸的实验值和计算值均减小,在振动条件下此模型的计算值和实验值有很好的一致性。

关键词：纳米颗粒振动流化床聚团大小振动参数能量模型

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Journal of Thermal Science 2005年第3期14卷 254-257页

作者： Kazuyuki kage Mihoko SHIROYAMA Katsuya ISHIMATSU Department of Mechanical and Energy Systems Engineering Oita University 700 Dannoharu Oita 870-1192 Japan ProfessorDepartment of Mechanical and Energy Systems Engineering Oita University 700 Dannoharu Oita 870-1192 JapanDepartment of Mechanical and Energy Systems Engineering Oita University 700 Dannoharu Oita 870-1192 Japan

The details of the shock propagated through the right angled multiple elbows (mainly double elbow and fourfold elbow) are investigated by the numerical study. Computations were carried out by solving the two-dimensional compressible Navier-Stokes equations by using the total variation diminishing (TVD) scheme. Computations were performed for six types of elbow (two types of double elbow and four types of fourfold elbow) and two incident shock Mach numbers (Ms=1.5, 2.3). The effects of the direction and number of the bends in the stabilizing, merging and attenuating processes of the shock are numerically explored by various diagrams such as pressure contours, pressure distributions on the walls and time histories of the pressure contours, and the strength of the shock front at the location of about 20 times the length for each type of elbows was displayed.

关键词： shock wave multiple elbow shock diffraction non-uniform shock merger of shock

Numerical Study of the Effects of the Secondary Diaphragm and Contact Surface in Expansion Tubes

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Journal of Thermal Science 2004年第1期13卷 30-33页

作者： Kazuyuki kage Katsuya Ishimatsu Toyoyasu Okubayashi Department of Production Systems Engineering Oita University700 DannoharuOita870-1192JapanDepartment of Production Systems EngineeringOita University700 DannoharuOita870-1192JapanDepartment of Production Systems EngineeringOita University700 DannoharuOita870-1192Japan

The interaction of the shock reflected at a secondary diaphragm with the primary contact in six cases, i.e. the strengths and shapes of the contact surface are different, were explored by numerical study. The influences of the strength and shape of the contact on the developing wave pattern and the quality of the test gas are illustrated by many kinds of figures (e.g. the time-distance diagrams of the acoustic impedance contours on the axis, the acoustic impedance contours, and the time histories of pilot and static pressures).

关键词： expansion tubes secondary diaphragm shock propagation contact surface

Numerical Study of Interaction of Propagated Shock with Boundary Layer Behind Contact Surface in Ducts

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Journal of Thermal Science 2003年第1期12卷 16-19页

作者： Kazuyuki kage Katsuya Ishimatsu Toyoyasu Okubayashi Department of Production Systems Engineering Oita University 700 DannoharuDepartment of Production Systems Engineering Oita University 700 Dannoharu OitaDepartment of Production Systems Engineering Oita University 700 Dannoharu Oita Oita 870-1192 Japan 870-1192 Japan870-1192 Japan

The interactions of the shock with the boundary layer of the cold gas behind the contact in many different conditions.i.e. three kinds of test gases and three kinds of sound speed ratios across the contact,were explored by numerical *** trajectories of the transmitted shock in cold gas flow and the development of shock bifurcation in the process of interaction with boundary layer are illustrated by many kinds of figures(*** time-distance diagrams of the acoustic impedance contours on the axis,the pressure and density contours and the static pressure distributions on the axis.).

关键词： contact surface shock wave over-tailored condition boundary layer.