Performance of Poly Alpha Olefin Nanolubricant
Performance of Poly Alpha Olefin Nanolubricant
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DOI：
10.3390/lubricants8020017
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发表时间：
2020-02-01
期刊：
影响因子：
3.5
通讯作者：
Brunton, Charles
中科院分区：
文献类型：
--
作者：
Dolatabadi, Nader;Rahmani, Ramin;Brunton, Charles
研究了分散在聚α -烯烃（PAO6）润滑油中的纳米金刚石颗粒在不同浓度下形成的纳米流体的粘度和摩擦学行为。摩擦系数随纳米颗粒浓度的变化在边界润滑、混合润滑和流体动力润滑下使用针盘摩擦测量法进行测量。开发了一个多尺度多物理场热混合润滑模型，以提供对测量摩擦结果的基本理解。该分析方法结合了连续接触力学、包括粗糙表面相互作用的热混合润滑以及热网传热模型。特别是，爱因斯坦关于分散的硬颗粒的粘度模型和Vogel关于含纳米颗粒的流体粘度的粘度-温度依赖模型代表了对知识的新贡献。这种纳米流体热学和摩擦学评估的综合数值-实验研究迄今尚未在文献中报道。研究表明，在混合润滑条件下，纳米流体传热能力的提高对减少摩擦特别有效。
The viscosity and tribological behavior of nanofluids formed by dispersed nano-diamond particles within Poly-Alpha-Olefin (PAO6) lubricant is studied at different concentrations. The variation of coefficient of friction with nanoparticle concentration is measured using pin-on-disc tribometry under boundary, mixed, and hydrodynamic regimes of lubrication. A multi-scale multi-physics thermo-mixed lubrication model is developed to provide fundamental understanding of the measured tribometric results. The analytical approach combines continuum contact mechanics, thermal-mixed lubrication comprising the interaction of rough surfaces, as well as a thermal network heat transfer model. In particular, Einstein's viscosity model for dispersed hard particles together with Vogel's viscosity-temperature dependence model for fluid viscosity containing nanoparticles represent new contributions to knowledge. This integrated numerical-experimental study of nanofluid thermal and tribological assessment has not hitherto been reported in literature. It is shown that improved heat transfer capability of nanofluids is particularly effective in the reduction of friction under a mixed regime of lubrication.