固体表面润湿性对滑块-盘接触润滑供油的影响
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摘要
基于荧光技术,研究了固体表面润湿性对滑块-盘面接触供油的影响.试验中以静止滑块和旋转玻璃盘构成摩擦副,润滑油围绕该面接触区构成一个供油油池.结果表明:充分供油条件下,滑块表面的润湿性影响油池润滑剂的分布,但仍能保证接触区润滑剂的充分供给.限量供油条件下,接触区外滑块表面润湿性影响了油池分布以及入口润滑剂的供给,低润湿性加剧接触区乏油程度,直接导致膜厚的降低.润滑剂的高表面张力及在盘表面的低粘附都会改善润滑剂在润滑轨道上的回流;润滑剂在盘表面的反润湿现象导致了离散分布的微液滴,对润滑轨道上的回流和润滑油膜的形成起到了正面作用.
Based on the fluorescence technique, the influence of surface wettability on the lubricating oil supply was studied with the test rig for measuring hydrodynamic lubrication film thickness in a slider-on-disc contact. In the experiments, the friction pair consists of a stationary slider and a rotating transparent disk. A closed oil pool around the contact region was formed. The results show that the distribution of the lubricant in the oil pool was affected by the wettability of the slider surface under fully supplied condition although the lubricant in the contact area was still sufficient. Under limited lubricant supply condition, the surface wettability of the slider outside the contact area affected the distribution of the oil pool and the supply of lubricant at the entrance of contact area. And the low wettability aggravated the degree of lack of oil in the contact area, which directly led to the decrease of the film thickness. The high surface tension of the lubricant and low adhesion of the disc surface improved lubricant replenishment on the contact track. The dewetting of the lubricant on the surface of the disk led to the discrete droplets, which had a positive effect on the lubricant replenishment on the contact track and the formation of the film thickness.
Based on the fluorescence technique, the influence of surface wettability on the lubricating oil supply was studied with the test rig for measuring hydrodynamic lubrication film thickness in a slider-on-disc contact. In the experiments, the friction pair consists of a stationary slider and a rotating transparent disk. A closed oil pool around the contact region was formed. The results show that the distribution of the lubricant in the oil pool was affected by the wettability of the slider surface under fully supplied condition although the lubricant in the contact area was still sufficient. Under limited lubricant supply condition, the surface wettability of the slider outside the contact area affected the distribution of the oil pool and the supply of lubricant at the entrance of contact area. And the low wettability aggravated the degree of lack of oil in the contact area, which directly led to the decrease of the film thickness. The high surface tension of the lubricant and low adhesion of the disc surface improved lubricant replenishment on the contact track. The dewetting of the lubricant on the surface of the disk led to the discrete droplets, which had a positive effect on the lubricant replenishment on the contact track and the formation of the film thickness.
引文
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[14]Ajaev V S.Interfacial Fluid Mechanics[M].Springer US,2012.
[2]Du Hongshi.Study on elastohydrodynamic lubrication with fluorescent technique[D].Beijing:Tsinghua University,1999(in Chinese)[杜红世.荧光技术在弹流润滑中的应用研究[D].北京:清华大学,1999].
[3]Huang L,Guo D,Wen S.Film thickness decay and replenishment in point contact lubricated with different greases:A study into oil bleeding and the evolution of lubricant reservoir[J].Tribology International,2016,93:620-627.doi:10.1016/j.triboint.2014.11.005.
[4]Chevalier F,Lubrecht A A,Cann P M E,et al.Film thickness in starved EHL point contacts[J].Journal of Tribology,1998,120(1):126-133.doi:10.1115/1.2834175.
[5]Chiu Y P.An analysis and prediction of lubricant film starvation in rolling contact systems[J].A S L E Transactions,1974,17(1):22-35.doi:10.1080/05698197408981435.
[6]Han Bing,Wang Wenzhong,Zhao Ziqiang.Oil replenishment mechanism of lubricated contact at low speed[J].Tribology,2016,36(3):341-347(in Chinese)[韩兵,王文中,赵自强.低速下润滑接触区补充供油机制的研究[J].摩擦学学报,2016,36(3):341-347].doi:10.16078/j.tribology.2016.03.011.
[7]Cann P M.Grease degradation in a bearing simulation device[J].Tribology International,2006,39(12):1698-1706.doi:10.1016/j.triboint.2006.01.029.
[8]Jacod B,Pubilier F,Cann P M E,et al.An analysis of track replenishment mechanisms in the starved regime[J].Tribology,1999,36(99):483-492.
[9]Ma Z Z,Zhang C H,Liu S H,et al.Study of lubrication behavior of pure water for hydrophobic friction pair[J].Science in China,2009,52(11):3128.doi:10.1007/s11431-009-0137-x.
[10]Hiratsuka K,Bohno A,Endo H.Water droplet lubrication between hydrophilic and hydrophobic surfaces[C]//2007:012012-012018
[11]Zang Shuyan,Guo Feng,Li Chao.Influence of surface wettability on lubrication by limited lubricant supply[J].Tribology,2017,37(4):429-434(in Chinese)[臧淑燕,郭峰,李超.表面亲润性对限量供油润滑影响的研究[J].摩擦学学报,2017,37(4):429-434].doi:10.16078/j.tribology.2017.04.002.
[12]Han Suli,Li Chao,Guo Feng,et al.Velocity profile measurement of oil films in a confined gap based on FRAP[J].Optics and Precision Engineering,2017,25(1):141-147(in Chinese)[韩素立,李超,郭峰,等.基于FRAP的微间隙润滑油膜流速测量方法[J].光学精密工程,2017,25(1):141-147].
[13]Wang Zhijun,Guo Feng,Tian Penghui.Correlation of interface adhesion work and hydrodynamic lubrication[J].lubrication engineering,2016,41(12):52-56(in Chinese)[王志君,郭峰,田鹏晖.界面黏附功与润滑油膜厚度的相关性研究[J].润滑与密封,2016,41(12):52-56].doi:10.3969/j.issn.0254-0150.2016.12.011.
[14]Ajaev V S.Interfacial Fluid Mechanics[M].Springer US,2012.