水蒸发对含水聚烷二醇弹性流体动力润滑的影响

IF 6.3 1区 工程技术 Q1 ENGINEERING, MECHANICAL Friction Pub Date : 2024-08-14 DOI:10.1007/s40544-024-0916-1
Stefan Hofmann, Thomas Lohner, Karsten Stahl
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引用次数: 0

摘要

减少动力传输齿轮中的摩擦功率损耗在节能和节约资源的传动系统设计中起着至关重要的作用。甘油和聚亚烷基二醇等含水润滑剂在弹性流体动力润滑条件下实现摩擦系数低于 0.01 的超润滑机制方面显示出巨大的潜力。此外,以生物为基础生产的基础油可促进绿色润滑油的开发。然而,在齿轮箱中应用含水润滑油所面临的一个挑战是水的蒸发及其对润滑油特性的影响。本研究调查了三种含水聚亚烷基二醇的水分蒸发对弹性流体动力摩擦和油膜厚度的影响。研究考虑了 20 wt% 和 40 wt% 两种标称含水量以及两种粘度。结果表明,摩擦力随着蒸发水含量的增加而持续增加,而在几乎不含水的状态下,总体摩擦力水平仍然很低。薄膜厚度也呈现出类似的趋势,粘度的大幅增加导致薄膜厚度显著增加。尽管如此,对于少量蒸发的水来说,摩擦力和薄膜厚度对水分蒸发的敏感度很低。这就为允许的含水量变化提供了宽松的临界值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Influence of water evaporation on elastohydrodynamic lubrication with water-containing polyalkylene glycols

The reduction of frictional power losses in power transmitting gears takes a crucial role in the design of energy- and resource-efficient drivetrains. Water-containing lubricants like glycerol and polyalkylene glycols have shown great potential in achieving friction within the superlubricity regime with coefficients of friction lower than 0.01 under elastohydrodynamic lubrication. Additionally, a bio-based production of the base stocks can lead to the development of green lubricants. However, one challenge associated with the application of water-containing lubricants to gearboxes is the evaporation of water and its impact on the lubricant properties. In this study, the influence of water evaporation on elastohydrodynamic friction and film thickness was investigated for three water-containing polyalkylene glycols. Two nominal water contents of 20 wt% and 40 wt% and two viscosities were considered. The results show that the friction increases continuously with higher evaporated water content, while the overall friction level remains low in nearly water-free states. A similar trend is observed for film thickness, where the strong increase in viscosity results in a notable increase in film thickness. Nevertheless, the sensitivity of friction and film thickness to water evaporation is low for small amounts of evaporated water. This allows generous thresholds for permissible variations in water content.

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来源期刊
Friction
Friction Engineering-Mechanical Engineering
CiteScore
12.90
自引率
13.20%
发文量
324
审稿时长
13 weeks
期刊介绍: Friction is a peer-reviewed international journal for the publication of theoretical and experimental research works related to the friction, lubrication and wear. Original, high quality research papers and review articles on all aspects of tribology are welcome, including, but are not limited to, a variety of topics, such as: Friction: Origin of friction, Friction theories, New phenomena of friction, Nano-friction, Ultra-low friction, Molecular friction, Ultra-high friction, Friction at high speed, Friction at high temperature or low temperature, Friction at solid/liquid interfaces, Bio-friction, Adhesion, etc. Lubrication: Superlubricity, Green lubricants, Nano-lubrication, Boundary lubrication, Thin film lubrication, Elastohydrodynamic lubrication, Mixed lubrication, New lubricants, New additives, Gas lubrication, Solid lubrication, etc. Wear: Wear materials, Wear mechanism, Wear models, Wear in severe conditions, Wear measurement, Wear monitoring, etc. Surface Engineering: Surface texturing, Molecular films, Surface coatings, Surface modification, Bionic surfaces, etc. Basic Sciences: Tribology system, Principles of tribology, Thermodynamics of tribo-systems, Micro-fluidics, Thermal stability of tribo-systems, etc. Friction is an open access journal. It is published quarterly by Tsinghua University Press and Springer, and sponsored by the State Key Laboratory of Tribology (TsinghuaUniversity) and the Tribology Institute of Chinese Mechanical Engineering Society.
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