ISSN   1004-0595

CN  62-1095/O4

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韩素立, 郭峰, 邵晶, 李超. 基于荧光漂白成像的润滑油膜剪切流速测量[J]. 摩擦学学报, 2017, 37(4): 442-448. DOI: 10.16078/j.tribology.2017.04.004
引用本文: 韩素立, 郭峰, 邵晶, 李超. 基于荧光漂白成像的润滑油膜剪切流速测量[J]. 摩擦学学报, 2017, 37(4): 442-448. DOI: 10.16078/j.tribology.2017.04.004
HAN Suli, GUO Feng, SHAO Jing, LI Chao. Velocity Profile Measurements of Oil Film under Pure Shear Based on Fluorescence Photobleaching Imaging Method[J]. TRIBOLOGY, 2017, 37(4): 442-448. DOI: 10.16078/j.tribology.2017.04.004
Citation: HAN Suli, GUO Feng, SHAO Jing, LI Chao. Velocity Profile Measurements of Oil Film under Pure Shear Based on Fluorescence Photobleaching Imaging Method[J]. TRIBOLOGY, 2017, 37(4): 442-448. DOI: 10.16078/j.tribology.2017.04.004

基于荧光漂白成像的润滑油膜剪切流速测量

Velocity Profile Measurements of Oil Film under Pure Shear Based on Fluorescence Photobleaching Imaging Method

  • 摘要: 沿润滑油膜厚度方向的剪切流速分布是影响机械部件润滑性能的重要因素. 为此,搭建了基于荧光漂白成像的微间隙油膜剪切流速分布测量平台. 通过对漂白区域形状演化过程进行图像分析,获得了微米量级间隙中的PB450和PAO6润滑油膜的剪切速度分布. 结果表明:在设定测试条件下,厚度为8.5 μm的PB450油膜沿膜厚方向的剪切流速近似为典型的线性分布,而相同厚度下的PAO6油膜流速分布表现为非线性塞流,界面附近油膜黏度较中层显著下降. 研究还发现,同一滑动速度下,PAO6剪切流速偏离线性分布的程度随膜厚的降低而增加. 经过比对分析,试验结果与流体动压润滑条件下的相关数据吻合.

     

    Abstract: Solid-liquid velocity profile is an important factor to affect the performance of the oil film lubrication. However, the velocity profile distribution of the fluid film lubrication in ambient pressure cannot be determined by effective experimental methods. In the present work, an apparatus has been built for in situ measuring velocity profile of thin oil film under confined micro-gaps by fluorescence photobleaching imaging microscopy technique and imaging the shape evolution of the bleached area under pure shear. The results show that the velocity profile of PB450 was typical linear distribution accordance with the lubrication theory, and there were obvious nonlinear plug velocity profile of poly alpha olefins (PAO6) lubricant film of 8.5 μm in thickness doped with fluorescent agent, probably because of the oil film viscosity decreased near the solid-liquid interface. Under the same sliding velocity, the deviation of velocity profile of the PAO6 oil film from the linear distribution increased along with the decrease of the film thickness. Velocity profile of the lubricant film was in agreement with the experimental results of hydrodynamic lubrication, which enhanced the reliability of the measurement results.

     

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