| Project/Area Number |
06650191
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Fluid engineering
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
OYAMA Tdamasa Tohoku Univ., Inst. Fluid Sci., Assistant, 流体科学研究所, 助手 (80006189)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Akira Tohokugakuin Univ., Engng. Dep., Assistant Professor, 工学部, 助教授 (30048805)
KAMIYAMA Shinichi Tohoku Univ., Inst. Fluid Sci., Professor, 流体科学研究所, 教授 (80006171)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1995: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1994: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Magnetic Fluid / Magnetic Field / Oscillatory Flow / Magnetic-optics |
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| Research Abstract |
It is clarified that the aggregation of magnetic particles in magnetic fluid flow under non-uniform magnetic field causes an increase in flow resistance due to the apparent change of reological properties of magnetic fluid. An optical measurement method is applied to verify this non-uniform concentration distribution of magnetic particles in a thin film of magnetic fluid. Taking into account the non-uniform concentration distribution in this film, the magnetic force distribution is estimated and compared with the case of uniform concentration distribution. The magnetic forces are calculated using the experimental result for magnetizations of magnetic fluids with variuos mass concentration of magnetic particles and compered to the case of uniform particle distribution. It is thought that these differences of concentration and magnetic forces between uniform and non-uniform dispersion of magnetic particles produce the large influences on the estimations of the magnetic fluid flow chracteristics. Threfore, the characteristics of oscillatory flow of magnetic fluid plug in U-tube are investigated using different mass concentrations of magnetic fluid. As a result, it is shown that there is an optimum mass concentration for producing the maximum amplitude of magnetic fluid plug. Theoretical and experimental investigations are carried out by using a model of a magnetic fluid viscous damper constructed by a cylinder filled with magnetic fluid and a piston connected to the cylinder with a mass and a spring. The flow of magnetic fluid between piston and cylinder is analyzed including the effect of particle aggregation. Displacement and phase difference of piston relative to cylinder are reduced by applying magnetic field.
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