Accession Number:

ADA048333

Title:

A Review of Theories for the Fluid Dynamic Effects of Roughness on Laminar Lubricating Films.

Descriptive Note:

Technical rept.,

Corporate Author:

COLUMBIA UNIV NEW YORK LUBRICATION RESEARCH LAB

Personal Author(s):

Report Date:

1977-12-01

Pagination or Media Count:

58.0

Abstract:

This report contains a comprehensive survey of theoretical work on the fluid dynamic effects of roughness in lubrication. Of necessity, much of the report deals with Reynolds roughness that is, roughness which can be locally analyzed with Reynolds equation because the wavelength of the roughness is not too short. One-sided and two-sided striated roughnesses are considered. Statistical and multiple-scale treatments are discussed and intercompared. Finally, the effects of short-wavelength roughness Stokes roughness are treated, as well as the consequences of slip in highly rarefied situations. Some new results for isotropic Reynolds roughness, for Stokes roughness, and for molecular slip are given preliminary exposure. Author

Subject Categories:

  • Lubricants and Hydraulic Fluids
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE