| Project/Area Number |
13555205
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
化学工学一般
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| Research Institution | Tokyo University of Agriculture and Technology |
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Principal Investigator |
HORIO Masayuki Tokyo University of Agriculture and Technology, Graduate School of Bio-Applications and Systems Engineering, Professor, 大学院・生物システム応用科学研究科, 教授 (40109301)
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| Co-Investigator(Kenkyū-buntansha) |
TAKEDA Hiroshi R-flow Co., Ltd., President (Researcher), 代表取締役(研究職)
KUWAGI Kenya Okayama University of Science, Faculty of Engineering, Lecturer, 工学部, 講師 (80302917)
NODA Reiji Tokyo University of Agriculture and Technology, Graduate School of Bio-Applications and Systems Engineering, Research Associate, 大学院・生物システム応用科学研究科, 助手 (70303708)
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| Project Period (FY) |
2001 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥13,900,000 (Direct Cost: ¥13,900,000)
Fiscal Year 2003: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2002: ¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2001: ¥9,600,000 (Direct Cost: ¥9,600,000)
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| Keywords | Powder / Fluidized bed / Simulation / Large-scale / Discrete Element Method / Representative Particle / 離散要素法(DEM) / 粒子間相互作用 / 代表粒子径モデル |
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| Research Abstract |
Although numerical description of particulate systems has recently been achieved a dramatic progress by the development of discrete element method (DEM) simulation technique originally proposed by Cundall and Strack (1979), it is evident that any realistic particulate system in industries contains billions of particles and that even for a current computer it is almost impossible to directly simulate them. The present work is a new challenge to large-scale DEMs starting from a scaling consideration on the governing equations taking into account cohesiveness and non-uniform particle properties.
For large-scale DEM simulation, the "Similar Particle Assembly (SPA) Model" was proposed for large-scale DEM simulation of particulate systems. The model includes the scaling law for the motion of particles in an assembly, which is derived from the equations of motion of particles. In the SPA model the motion of multiple particles whose diameter, density and chemical composition are the same is rep
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resented by one particle, which is called a representative particle. A representative particle occupies the same volume as the sum of the volume of represented particles and has the same density and chemical composition. The local assembly of different particles in the ginal bed is supposed to be maintained in the bed of representative particles. With the SPA model the flow of the bed of representative particles of a certain magnification can be made similar to that of the original particles with a much less computation load. The most significant aspect of the SPA model is that it can be applied to beds of cohesive particles as well as particles of non-uniform sizes. The model was validated by numerical simulation of a two-dimensional bed of non-cohesive particles of equal properties, a bed of particles of two different densities and cohesive particles up to the magnification of 6.
Moreover, particle size distribution was introduced into the conventional three-dimensional DEM simulation code with some modification in both theoretical modeling and computational scheme for the calculation of particle-fluid interaction force. The 3-dimensional simulation for non-uniform particle size system was carried out by using the modified scheme. The bubble with clear wake phase was observed when the particle size distribution was considered. On the other hand, the bed behavior was slugging-like when the particle size distribution was not considered. Less
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