Experimental Study of the Interfacial Slip on Hydrodynamic Lubrication Under Different Wettabilities

IF 1.8 4区工程技术 Q3 ENGINEERING, CHEMICAL

Lubrication Science Pub Date : 2024-04-15 DOI:10.1002/ls.1709

Suli Han, Feng Guo, Jing Shao, Qian Wang, Xinming Li, Wei Jin

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Abstract

This article presents an experimental study about boundary slippage on the film thickness of hydrodynamic lubrication (HL) using a custom-made slider-on-disc bearing testing apparatus. The interfaces with different affinity were obtained by surface energy modification of sliders with various oleophobic coatings, which are characterised by their contact angle (CA) and contact angle hysteresis (CAH). To study the mechanism of interfacial slip on HL under different wettability constraints, the film thickness and velocity profiles under shear were measured using interference and fluorescence photobleached method, respectively. The results showed that the CAH could better characterise the influence of interface effect on the film thickness of HL, which was explained by the correlation between CAH and the interface potential barrier. Furthermore, it was found that the slip velocity increased with lubricant viscosity and shear rate, which can be explained by the spatial heterogeneity of the flow in conformal contact and the critical shear stress slip model.

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不同润湿性下流体动力润滑界面滑移的实验研究

本文利用定制的滑块-圆盘轴承测试仪器，对流体动力润滑（HL）薄膜厚度的边界滑动进行了实验研究。通过对滑块进行表面能改性，在其表面涂上不同的疏油涂层，从而获得不同亲和力的界面，并通过接触角（CA）和接触角滞后（CAH）对其进行表征。为了研究不同润湿性约束条件下 HL 上界面滑移的机理，分别采用干涉法和荧光光漂白法测量了剪切作用下的薄膜厚度和速度曲线。结果表明，CAH 能更好地表征界面效应对 HL 薄膜厚度的影响，CAH 与界面势垒之间的相关性解释了这一点。此外，研究还发现滑移速度随润滑剂粘度和剪切速率的增加而增加，这可以用保形接触中流动的空间异质性和临界剪切应力滑移模型来解释。

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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来源期刊

Lubrication Science ENGINEERING, CHEMICAL-ENGINEERING, MECHANICAL

CiteScore

3.60

自引率

10.50%

发文量

审稿时长

6.8 months

期刊介绍： Lubrication Science is devoted to high-quality research which notably advances fundamental and applied aspects of the science and technology related to lubrication. It publishes research articles, short communications and reviews which demonstrate novelty and cutting edge science in the field, aiming to become a key specialised venue for communicating advances in lubrication research and development. Lubrication is a diverse discipline ranging from lubrication concepts in industrial and automotive engineering, solid-state and gas lubrication, micro & nanolubrication phenomena, to lubrication in biological systems. To investigate these areas the scope of the journal encourages fundamental and application-based studies on: Synthesis, chemistry and the broader development of high-performing and environmentally adapted lubricants and additives. State of the art analytical tools and characterisation of lubricants, lubricated surfaces and interfaces. Solid lubricants, self-lubricating coatings and composites, lubricating nanoparticles. Gas lubrication. Extreme-conditions lubrication. Green-lubrication technology and lubricants. Tribochemistry and tribocorrosion of environment- and lubricant-interface interactions. Modelling of lubrication mechanisms and interface phenomena on different scales: from atomic and molecular to mezzo and structural. Modelling hydrodynamic and thin film lubrication. All lubrication related aspects of nanotribology. Surface-lubricant interface interactions and phenomena: wetting, adhesion and adsorption. Bio-lubrication, bio-lubricants and lubricated biological systems. Other novel and cutting-edge aspects of lubrication in all lubrication regimes.