Analysis of thermally induced levitation mechanism based on thermo-molecular gas film lubrication theory
| Project/Area Number |
16K14147
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Design engineering/Machine functional elements/Tribology
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| Research Institution | Tottori University |
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Principal Investigator |
Fukui Shigehisa 鳥取大学, 工学(系)研究科(研究院), 特任教授 (40273883)
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| Co-Investigator(Kenkyū-buntansha) |
松岡 広成 鳥取大学, 工学研究科, 准教授 (10314569)
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| Project Period (FY) |
2016-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | 分子気体潤滑理論 / 適応係数 / 熱ほふく流 / 準自由分子流 / 自由分子流 / 分子気体潤滑 / ナノトライボロジー / 分子気体潤滑(ｔ-MGL) / MEMS/NEMS |
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| Outline of Final Research Achievements |
In the present research, the flying characteristics of a step slider flying in either air or He with a local temperature distribution of the disk are analyzed using the thermo-molecular gas-film lubrication (t-MGL) equation in the quasi-free-molecular flow region (quasi-free-molecular t-MGL equation: t-MGLqfm eq.). The gas temperature in the t-MGLqfm equation, Tau_G, is assumed to be that in the free molecular limit, Tau_Gfm, defined by temperatures and accommodation coefficients at the disk, Tau_W0, Alpha_0, and those at the slider, Tau_W1, Alpha_1, respectively. The decreases in static spacing for the slider flying in He are significant. Moreover, the spacing decreases as the accommodation coefficients of the disk, Alpha_0, decreases, that is, as the ratio of specular reflection increases. The spacing fluctuation caused by a running wavy disk varies according to both the ambient gas (air/He) and the boundary accommodation coefficients.
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Report
(3 results)
Research Products
(9 results)
