2002 Fiscal Year Final Research Report Summary
Research on Flow Control of Dense Gas-Solid Flows
| Project/Area Number |
13450075
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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 | 一般 |
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| Research Field |
Fluid engineering
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| Research Institution | Osaka University |
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Principal Investigator |
TSUJI Yutaka Osaka University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (10029233)
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| Co-Investigator(Kenkyū-buntansha) |
KAWAGUCHI Toshihiro Osaka University, Graduate School of Engineering, Research Associate, 大学院・工学研究科, 助手 (80234045)
TANAKA Toshitsugu Osaka University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (90171777)
YOSHIOKA Muneyuki Osaka University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (10029267)
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| Project Period (FY) |
2001 – 2002
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| Keywords | multi-phase flow / gas-solid flow / fluidized bed / standpipe flow / flow control |
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| Research Abstract |
The objective of this study is the control of meso-scale structures in dense gas-solid flows, First, the effect of gas pulsation on the bubble motion in a fluidized bed was investigated numerically and experimentally. It was found both in the calculation and the experiment that characteristic bubbles were generated when the injected gas velocity was pulsated at a certain frequency band. When the pressure drop through the gas distributor was considered the calculated bubble motion agree with that in the corresponding experiment. Gas pulsation is one of the promissing ways to control the bubble motion in the fluidized bed, and the calculation taking account of the pressure drop through the gas distributor can predict the effect of the gas pulsation on the bubble motion.
Next, the plug motion in a standpipe flow was studied. When the drag coefficient is modified taking account of the wall effect the predicted pulg length and the plug velocity agree well with those in the corresponding experiment. The length, velocity, frequency of breakup of plugs are investigated statistically by using the calculated results. A plug flow model for a one-dimensional steady standpipe flow was proposed.
Finally, a similarity model was proposed, in which the motion of particles are simulated by using larger model-particles. The similarity model was applied to the numerical simulation of a fluidized bed, and the effect of the model-particle size on the bubble motion was investigated.
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