| Project/Area Number |
18560133
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Design engineering/Machine functional elements/Tribology
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| Research Institution | Okayama University |
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Principal Investigator |
TAKAHASHI Satoshi Okayama University, Graduate Scheel of Natural Seience and Technology, Associate Professor (20236277)
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| Co-Investigator(Kenkyū-buntansha) |
WASHIO Seiichi Okayama University, Graduate School of Natural Science and Technology, Professor (20026222)
DEGUCHI Shinji Tohhoku University, Center for Research Strategy and Support, Associate Professor (30379713)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,850,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥450,000)
Fiscal Year 2007: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2006: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | Flow electrification / Pulsating flow / Vibration / Relaxation / Velocity distribution / Transiently current / Phase delay / Freauency / 水分 / 体積抵抗率 / 周波数 |
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| Research Abstract |
Measurement of electrification in transient change of velocity
The current detected from the metal wall rose to a peak value at the beginning of flow, then exponentially decreased until it leveled off with time, approaching a constant value. The smaller the acceleration of velocity was, the smaller the peak value of current was. This behavior of the current presumably indicates that relaxation of charge depends on the time, though generation of charge depends not on the time but on the gradient of velocity on the interface.
Measurement of electrification in pulsating oil flow
Pulsating oil flows were let pass through a metal mesh and a metal plate with eight holes. The current fluctuates at the same frequency as that of the flow rate. The relationship between the current and the flow rate in an oil flow pulsating at lower frequencies can be approximated by that in a steady flow. However, it is no more the case for higher frequencies. The delay times of the current behind the flow rate take almost the same value for different frequencies in the present experiment.
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