摘要
由于固液界面处存在双电层,理论和试验研究都表明该效应对薄膜润滑有较为明显的影响。首先,利用自行设计的外加电场重构双电层装置进行了组合滑块水润滑试验,结果分析表明:双电层所引起的电粘度效应对流体润滑中摩擦因数有明显影响,另外当摩擦副的材料不同时,摩擦因数的变化规律不同。然后,又对KCl(氯化钾)溶液进行了组合滑块试验,进一步研究了离子浓度对电粘度效应的影响,在不同速度和溶液浓度的工况下,对摩擦因数进行了测量。结果表明:低浓度溶液使摩擦因数明显增加,浓度高时摩擦因数减小;随着速度的增加,双电层效应对摩擦因数的影响减小。最后,对试验工况进行了数值分析。
Theoretical and experimental researches show that
electro-viscosity by electric double layer (EDL) apparently
influences on thin film lubrication (TFL). In order to consider
the influence of EDL, some tests with a composite sliding block
are carried ou by the way that external electric field is used to
reconstruct EDL with water used as lubricant. Results showed
that EDL has apparent effect on friction coefficient. To ensure
the results, further tests are done where aqueous KCI solution is
used as lubricant. The influence of electro-viscosity on friction
coefficient is studied by changing concentration of KCI. Results
showed that EDL has apparent effect on friction coefficient in
TFL, 30% in increase. Finally, numerical analysis is also
carried out to show the effect of EDL electro-viscosity on
friction coefficient in TFL.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2004年第5期34-38,共5页
Journal of Mechanical Engineering
基金
国家自然科学基金(50375052)
广东省教育厅'千百十工程'优秀人才培养基金
关键词
双电层
电粘度
摩擦因数
外电场
Electric double layer
Electro-viscosity
Friction coefficient
External electric field
