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

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)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1977
Accession Number
ADA048333

Entities

People

  • Harold G. Elrod

Organizations

  • Columbia University

Tags

Communities of Interest

  • C4I
  • Energy and Power Technologies
  • Materials and Manufacturing Processes
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Differential Equations
  • Engineering
  • Equations
  • Fluid Dynamics
  • Friction
  • Heat Transfer
  • Lubricants
  • Lubricating Films
  • Lubrication
  • Mechanical Engineering
  • Military Research
  • Nuclear Engineering
  • Pressure Gradients
  • Standards
  • Statistical Analysis
  • Surface Roughness
  • Two Dimensional

Readers

  • Fluid Dynamics.
  • Systems Analysis and Design
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).