A novel approach to measure slip-length of thin lubricant films under high pressures

A novel approach to measure slip-length of thin lubricant films under high pressures
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一种测量高压下润滑油膜滑移长度的新方法

DOI:
10.1016/j.triboint.2011.03.015
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发表时间:
2012-02
影响因子:
6.2
通讯作者:
--
中科院分区:
工程技术1区
文献类型:
--
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通过实验和理论分析,已经发现了大量的液/固界面滑移的证据。最近的研究表明,润滑剂的边界滑移效应在小的封闭间隙中可以是明显的,即使是简单的牛顿流体。因此,在弹流润滑接触中,高压润滑薄膜是否存在边界滑移,以及如何量化边界滑移,是一个值得探讨的问题。本文提出了一种测量高压下小间隙内润滑薄膜滑移长度的方法。文中详细阐述了测量原理。这个想法利用了这样一种现象,即少量的润滑剂可以被截留,并通过将钢球撞击在润滑的玻璃板上形成凹坑膜。滑移长度可以从凹坑相对于固体表面的相对运动中提取。最后通过实例验证了该方法的可行性。
Abundant evidence of boundary slip at liquid/solid interfaces has been presented by experiments and theoretical analyses. Recent research reveals that the boundary slip effect of lubricants can be obvious in small confined gaps, even with simple Newtonian fluids. Therefore, it is appropriate to ask if there is boundary slip of thin highly pressurized lubricant films in EHL contacts, and, if so, how to quantify it. This paper proposes a method for measuring the slip-length of lubricant films within a small gap under high pressure. Measurement principles have been addressed in details in the paper. The idea makes use of the phenomenon whereby a tiny quantity of lubricant can be entrapped and forms a dimple film by impacting a steel ball against a lubricated glass plate. The slip-length can be extracted from the relative movement of the dimple against the solid surfaces. Case experiments are also presented to validate the feasibility of the method.
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