NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PUBLICATIONS

Normalized Ashurst-Hoover Scaling and a Comprehensive Viscosity Corelation for Compressed Liquids

Published

Author(s)

Arno R. Laesecke, Scott Bair

Abstract

The recent move toward physics-based elastohydrodynamics promises to yield advances in understanding of the mechanisms of friction and film generation not possible a few years ago. However, the accurate correlation of the low-shear viscosity with temperature and pressure is an essential requirement. The Ashurst-Hoover thermodynamic scaling, which has been useful for thermal elastohydrodynamic simulation, is normalized here in a manner which maps the viscosity of three widely different liquids onto a maser Stickel curve. The master curve can be represented by a combination of two expotential power law terms. These may be seen as expressions of different molecular interaction mechanisms similar to the two free-volume models of Batschinski-Hildebrand and Doolittle, respectively. The new correlation promises to yield more reasonable extrapolations to extreme conditions of temperature and pressure than free-volume models, and it removes the singularity that has prevented wide acceptance of free-volume models in numerical simulations.
Citation
Journal of Tribology-Transactions of the ASME
Volume
134
Pub Type
Journals

Keywords

EHL, elastohydrodynamics, high-pressure, high-temperature, rheology, viscosity
Thermodynamics

Citation

Laesecke, A. and Bair, S. (2012), Normalized Ashurst-Hoover Scaling and a Comprehensive Viscosity Corelation for Compressed Liquids, Journal of Tribology-Transactions of the ASME (Accessed October 17, 2025)

Issues

If you have any questions about this publication or are having problems accessing it, please contact [email protected].

Created March 6, 2012, Updated February 19, 2017
Was this page helpful?