粗糙度引起的变化是平行表面间流体动力润滑的新机制

IF 6.3 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Pau Català, Vallbé-Mumbrú Marc, Francesc Pérez-Ràfols
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引用次数: 0

摘要

这项工作提出了一种新的升力机制,能够解释在实际机械密封中观察到的平行表面的流体动力升力。虽然已经确定粗糙度是引起这种升力的关键因素,但其影响通常以微楔和粗糙度级空化的形式解释。这项工作的新颖之处在于考虑了粗糙度在流动限制中引起的随机变化,这导致了有效的楔形。首先,开发了一个专用的随机双尺度模型,并在案例研究中用于演示所提出的新机制。我们证明了所描述的新机制在与密封宏观尺寸相当的尺度上起作用,比通常认为的微楔大得多。然后,讨论了这种新机制的局限性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Roughness induced variation as a new mechanism for hydrodynamic lubrication between parallel surfaces

Roughness induced variation as a new mechanism for hydrodynamic lubrication between parallel surfaces

This work proposes a new lift mechanism capable of explaining the hydrodynamic lift observed in real mechanical face seals with parallel surfaces. While it is well established that roughness is a key factor inducing such lift, its effect is commonly explained in the form of micro-wedges and asperity-level cavitation. The novelty of this work is to consider roughness induced random variability in the flow restriction, which induces effective wedges. First, a dedicated stochastic two-scale model is developed and used to demonstrate the proposed new mechanism in a case study. We demonstrate that the described new mechanism acts at scales comparable to the macroscopic size of the seal, much larger than the commonly considered micro-wedges. Afterwards, the limitations for this new proposed mechanism are discussed.

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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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