摘要:

The flow in a recess of a hydrostatic journal bearing is studied in detail. The Navier-Stokes equations for the laminar flow of an incompressible liquid are solved numerically in a two-dimensional plane of a typical bearing recess. Pressure- and shear-induced flows, as well as a combination of these two flow conditions, are analyzed. Recess friction, pressure-ram effects at discontinuities in the flow region, and film entrance pressure loss effects are calculated. Entrance pressure loss coefficients over a forward-facing step are presented as functions of the mean flow Reynolds number for pure-pressure and shear-induced laminar flows.Presented as a Society of Tribologists and Lubrication Engineers paper at the STLE/ASME Tribology Conference in St. Louis, Missouri, October 14–16, 1991

ISSN:1040-2004    

DOI:10.1080/10402009208982179

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Rolling element bearings operating under mixed or boundary lubrication conditions experience a higher metallic contact ratio (MCR) between the surfaces, and a corresponding decrease in rolling contact fatigue life. This paper evaluates the effects of randomly distributed small indentations, or pits, on the lubricating properties when operating under these mixed or boundary lubrication conditions.

ISSN:1040-2004    

DOI:10.1080/10402009208982180

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Thermoviscous lubricant flow in seals and bearings is treated as a Couette flow, and a fully coupled perturbation flow, which results from waviness of the boundary, and which gives rise to uneven heat input into the solid boundaries. Differences in modes of heat transfer within the seal rings and out to the environment are separable, and determine the thermoviscous behavior of the film in a simple way. The temperature perturbation, or wave, in the film is an order of magnitude smaller than the perturbation of heat generation, justifying the assumption of isothermal and isoviscous flow.

ISSN:1040-2004    

DOI:10.1080/10402009208982181

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The analogy between elastic solids and viscous fluids is exploited to analyze the collapse of a spherical cavity or void in a thin viscous film, and the initiation of a cavity at a spot on a solid boundary. The analysis shows why the concept of stress-waves from implosions of cavities would not be expected to produce surface damage. Application of crack theory in the second instance accounts for a source of transient high surface stress in the process of cavity formation.Presented at the 47th Annual Meeting in Philadelphia, Pennsylvania May 4–7, 1992

ISSN:1040-2004    

DOI:10.1080/10402009208982182

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor