Low Friction and High Load Support Capacity of Slider Bearing With a Mixed Slip Surface

[+] Author and Article Information
C. W. Wu, G. J. Ma, P. Zhou

State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, China

C. D. Wu

Artificial Intelligence Institute, Northeastern University, Shenyang 110004, China

J. Tribol 128(4), 904-907 (Jun 01, 2006) (4 pages) doi:10.1115/1.2345419 History: Received May 11, 2005; Revised June 01, 2006

The classical Reynolds theory reveals that a converging gap is the first necessary condition to generate a hydrodynamic pressure in a viscous fluid film confined between two solid surfaces with a relative sliding/rolling motion. For hundreds of years, the classical lubrication mechanics has been based on the frame of the Reynolds theory with no slip assumption. Recent studies show that a large boundary slip occurs on an ultrahydrophobic surface, which results in a very small friction drag. Unfortunately, such a slip surface also produces a small hydrodynamic pressure in a fluid film between two solid surfaces. This paper studies the lubrication behavior of infinite width slider bearings involving a mixed slip surface (MSS). The results of the study indicate that any geometrical wedges (gaps), i.e., a convergent wedge, a parallel gap, and even a divergent wedge, can generate hydrodynamic pressure in an infinite slider bearing with a mixed slip surface. It is found that with an MSS, the maximum fluid load support capacity occurs at a slightly divergent wedge (roughly parallel sliding gap) for an infinite width slider bearing, but not at a converging gap as what the classical Reynolds theory predicts. Surface optimization of a parallel sliding gap with a slip surface can double the hydrodynamic load support and reduce the friction drag by half of what the Reynolds theory predicts for an optimal wedge of a traditional slider bearing.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Schematic of an infinite width slider bearing with a mixed slip surface

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Figure 2

Lubrication film pressure distributions for several values of gap ratios. The solid curves denote the pressures generated by the mixed slip surface (Bs∕B=0.65), and the dashed curve denotes that generated by a no-slip surface. The dimensionless limiting shear stress at the slip zone is defined as T0a=τLah2∕ηU=0 (perfect slip surface).

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Figure 3

Effects of the length of slip zone, Bs, on the fluid load support (a), friction force at bottom surface (b) and volume flow (c), where WBs=wBsh22∕ηUB2 denotes the dimensionless fluid load support of an MSS slider bearing, Wmax=wh22∕ηUB2=0.1602 is the dimensionless maximum load support of the no-slip slider bearing (ξ=2.2), F=fh2∕ηUB is the dimensionless friction drag, and Q=q∕h2U is the dimensionless volume flow. wBs, wmax, f, and q are, respectively, the physical quantities in unit width corresponding to WBs, Wmax, F, and Q.

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Figure 4

Effect of the gap ratio, ξ, on the fluid load support of the slider bearing with a mixed slip surface (Bs∕B=0.65) for several values of the limiting shear stress

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Figure 5

Ratio of the hydrodynamic load support of an MSS slider bearing to that of no-slip slider bearing versus the normalized surface limiting shear stress for several values of gap ratios



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