A New Method of Measuring Multigrade Oil Shear Elasticity and Viscosity at High Shear Rates,

Abstract

Recent journal bearing oil film thickness data (1) strongly suggest that, in order to develop minimum-viscosity multigrade oils for maximizing fuel economy, it is not enough to examine viscosity n alone, it is essential also to examine a certain kind of shear elasticity, of which one measure is the first normal stress difference N1 in shear flow. Within a group of isoviscous multigrade oils, N1 values can differ significantly; for 10W-40 and 15W-40 oils, an average of 75% of the minimum oil film thickness can be attributed to N1. Keywords: Lubrication, Oil shear elasticity, First normal stress difference, Oil viscosity, Stressmeter, High shear rate, Reprints.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1987
Accession Number
ADA190145

Entities

People

  • Arthur S. Lodge

Organizations

  • University of Wisconsin–Madison

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Bearings
  • Block Copolymers
  • Coefficients
  • Elastic Properties
  • Engineering
  • Equations
  • Flow
  • Flow Rate
  • Geometry
  • Journal Bearings
  • Lubrication
  • Measurement
  • Shear Flow
  • Shear Stresses
  • Thickness
  • Viscometers
  • Viscosity

Readers

  • Fluid Dynamics.
  • Petroleum Engineering
  • Systems Analysis and Design