| Project/Area Number |
59460086
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Fluid engineering
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| Research Institution | Ehime University |
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Principal Investigator |
AYUKAWA Kyozo Ehime University, Faculty of Engineering; Professor, 工学部, 教授 (30036230)
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| Co-Investigator(Kenkyū-buntansha) |
TAKABATAKE Shin Ehime University, Faculty of Engineering; Assistant, 工学部, 助手 (70127900)
OCHI Jyunji Ehime University, Faculty of Engineering ; Assistant professor, 工学部, 助教授 (00036245)
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| Project Period (FY) |
1984 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥8,100,000 (Direct Cost: ¥8,100,000)
Fiscal Year 1986: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1985: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1984: ¥6,800,000 (Direct Cost: ¥6,800,000)
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| Keywords | Pipe flow / Solid-liquid flow / Turbulence / Coherent structure / Concenration profile / 流体中の粒子運動 |
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| Research Abstract |
Penetration depth on an ejection, which played an important role in the formation of concentration profile and generation of turbulent energy, was studied by means of a probability density distribution. The depth in a two phase flow was smaller than a single phase flow, the depth of a solid particle at the ejection was much smaller than that. These difference was supposed to be caused by the relaxation process of a solid particleand its reaction on the flow. This conjecture was made clear by the analysis of a particle motion in the flow. We had an exact solution on the integro-differential equation of motion of a neutrally buoyant particle, involved Stokes resistance and Basset term. This solution behaved <t^(-1/2)> in assymptotic expansion, in contrast to the exponential behavior in the case of Stokes resistance only.
The probability density distribution of vertical velocities at ejection had two peaks near the wall. This results showed the possibility of the existence of different mechanism on the generation of ejection.
The simple simulation model on the concentration profilewas constructed in the separation of ejection process from turbulent diffusion. The ejection process was treated as a periodically convective term in the diffusion equation. the results of this model were fairly in the agreement with the results of experiment, especially near the wall.
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