粗糙接触界面的地形变化和流体流动特性

IF 6.3 1区 工程技术 Q1 ENGINEERING, MECHANICAL Friction Pub Date : 2024-08-05 DOI:10.1007/s40544-024-0911-6
Jiawei Ji, Wei Sun, Yu Du, Yongqing Zhu, Yuhang Guo, Xiaojun Liu, Yunlong Jiao, Kun Liu
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引用次数: 0

摘要

了解粗糙接触附近流体的流动特性对于设计基于流体的润滑和摩擦学物理基础非常重要。本研究利用自制的光学原位测试仪观察了无水乙醇在玻璃和粗糙 PDMS 之间界面的扩散和渗流过程。通过数字图像处理技术和数值模拟软件,识别并提取了界面的拓扑特性和稀薄流体的流动特征。特别关注了不同应力下接触界面形貌的动态演变、界面中微通道的分布、流体在接触界面中的扩散特性以及机械驱动机制。原始表面形态和接触应力对界面形貌和界面微通道分布有显著影响,这表明微通道的特征长度、铺展面积和流体的铺展率与载荷成反比。而流体在界面中的流动路径主要分为三个阶段:沿岛壁流动、产生液桥、在楔形通道中从顶端侧向根部侧移动。液体在界面中流动的主要力学机制是推动液体扩散的毛细力与固体壁对液体的粘性阻力之间的平衡。此外,由于微通道的不规则特性,在流动过程中会出现 "滞留空气 "现象。这项研究为研究粗糙接触界面中液体的微观流动行为、机械系统的摩擦和润滑以及密封机理奠定了一定的理论基础。
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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Topographic variation and fluid flow characteristics in rough contact interface

Understanding flow characteristics of fluid near rough contact is important for the design of fluid-based lubrication and basic of tribology physics. In this study, the spreading and seepage processes of anhydrous ethanol in the interface between glass and rough PDMS are observed by a homemade optical in-situ tester. Digital image processing technology and numerical simulation software are adapted to identify and extract the topological properties of interface and thin fluid flow characteristics. Particular attention is paid to the dynamic evolution of the contact interface morphology under different stresses, the distribution of microchannels in the interface, the spreading characteristics of the fluid in contact interface, as well as the mechanical driving mechanism. Original surface morphology and the contact stress have a significant impact on the interface topography and the distribution of interfacial microchannels, which shows that the feature lengths of the microchannels, the spreading area and the spreading rate of the fluid are inversely proportional to the load. And the flow path of the fluid in the interface is mainly divided into three stages: along the wall of the island, generating liquid bridges, and moving from the tip side to the root side in the wedge-shaped channel. The main mechanical mechanism of liquid flow in the interface is the equilibrium between the capillary force that drives the liquid spreading and viscous resistance of solid wall to liquid. In addition, the phenomenon of “trapped air” occurs during the flow process due to the irregular characteristics of the microchannel. This study lays a certain theoretical foundation for the research of microscopic flow behavior of the liquid in the rough contact interface, the friction and lubrication of the mechanical system, and the sealing mechanism.

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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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