| Project/Area Number |
03650127
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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 |
機械要素
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| Research Institution | Nagoya University |
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Principal Investigator |
MITSUYA Yasunaga Nagoya University Dept. of Electronic Mechanical Engineering Professor, 工学部, 教授 (10200065)
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| Project Period (FY) |
1991 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1992: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1991: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Magnetic field / Magnetic fluid seal / Flow on surface / Magnetic fluid / Splashing / Meniscus / 磁性流体ミ-ル |
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| Research Abstract |
The magnetic force distribution on the yoke surface of a magnetic fluid seal is clarified using finite element analysis. Calculations are performed for two kinds of typical magnetic fluid shape, that is, film shape and spike shape. It is interesting to note that magnetic force direction switches halfway the yoke length. The region wherein magnetic fluid flows to the yoke top direction is found to be wider for a thicker magnet,thicker yoke and the case with a spindle. This leads to a new concept of magnetic fluid seal having self injection action.
The critical rotational speed at which splashing of the magnetic fluid is initiated is found to be uniquely determined by the spread of the meniscus under a fixed magnetic flux condition. It should be noted that, with increasing flux density from 0.2 to 0.4T, the critical speed is considerable increased nearly two times.
Calculation procedure to determine the surface shape of the meniscus formed around the seal gap is established through the extension of the SMAC method to the case involving surface tension and magnetic force. The calculation is justified being compared with the experimental meniscus shape.
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