Abstract
The mean free path and the viscosity of helium-air gas mixtures were calculated as a function of the helium fraction. The second-order-slip modified Reynolds equation was solved using the finite element method. The hydrodynamic pressure and film thickness of the micro-bearing were obtained. The effects of helium fraction, groove depth and angular velocity on the bearing characteristics of the micro-bearing were investigated. The results show that when the groove depth increased from 1 μm to 10 μm, the film thickness of the micro-bearing firstly increased and then decreased, reaching a maximum at the groove depth of 5 μm, which represented an optimum bearing capacity. In addition, at a groove depth less than 5 μm, the mean free path of the gas mixtures had a dominant effect on the film thickness of the micro-bearing. However, when the groove depth was larger than 5 μm, the effect of the gas viscosity dominated.
| Translated title of the contribution | Analysis on the Bearing Characteristics of Gas-Lubricated Spiral-Groove Thrust Micro-Bearings in Helium-Air Gas Mixtures |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 213-219 |
| Number of pages | 7 |
| Journal | Tribology |
| Volume | 38 |
| Issue number | 2 |
| DOIs | |
| State | Published - 1 Mar 2018 |
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