Application of Average Flow Model to Lubrication Between Rough Sliding Surfaces
01 Apr 1979-Journal of Lubrication Technology (American Society of Mechanical Engineers)-Vol. 101, Iss: 2, pp 220-229
About: This article is published in Journal of Lubrication Technology.The article was published on 1979-04-01. It has received 1103 citations till now. The article focuses on the topics: Lubrication theory & Lubrication.
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TL;DR: In this paper, the authors provide a comparative summary of different modeling techniques for fluid flow, cavitation and micro-hydrodynamic effects for surface texturing, and provide the key findings.
590 citations
TL;DR: In this paper, the nature of the surfaces encountered in the piston assembly, valve train and journal bearings of an internal combustion engine is reviewed and mathematical models of engine tribology are endeavouring to cope with the extreme complexities the incorporation of surface topography potentially brings.
334 citations
01 Jan 1998
TL;DR: In this article, the authors review the nature of the surfaces encountered in the piston assembly, valve train and journal bearings of an internal combustion engine and how mathematical models of engine tribology are endeavouring to cope with the extreme complexities the incorporation of surface topography potentially brings.
Abstract: There has been relentless pressure in the second half of the twentieth century to develop ever more fuel efficient and compact automobile engines with reduced environmental impact. From the viewpoint of the tribologist this means increasing specific loads, speeds and temperatures for the major frictional components of the engine, namely the piston assembly, the valve train and the journal bearings, and lower viscosity engine oils with which to lubricate them. Inevitably, this leads to decreasing oil film thicknesses between the interacting surfaces of these components and a more crucial role for the topography and surface profile of the two surfaces in determining tribological performance. This paper will review the nature of the surfaces encountered in the piston assembly, valve train and journal bearings of the internal combustion engine and how mathematical models of engine tribology are endeavouring to cope with the extreme complexities the incorporation of surface topography potentially brings. Key areas for future research and the implications for design will be highlighted.
330 citations
TL;DR: In this article, a numerical model is used to analyze the cylindrical texture shape effect on the characteristics of a hydrodynamic journal bearing and the theoretical results show that the most important characteristics can be improved through an appropriate arrangement of the textured area on the contact surface.
281 citations
TL;DR: The contact between a rigid solid with a randomly rough surface and an elastic block with a flat surface is studied and it is shown that, for nonadhesive interaction and small applied pressure, p approximately exp(-u/u(0), in good agreement with recent experimental observations.
Abstract: I study the contact between a rigid solid with a randomly rough surface and an elastic block with a flat surface. I derive a relation between the (average) interfacial separation $u$ and the applied normal squeezing pressure $p$. I show that, for nonadhesive interaction and small applied pressure, $p\ensuremath{\sim}\mathrm{exp} (\ensuremath{-}u/{u}_{0})$, in good agreement with recent experimental observations.
239 citations