MODELLING THE PRESSURE AND TEMPERATURE DEPENDENCE OF VISCOSITY AND VOLUME FOR HYDRAULIC FLUIDS

Authors

  • Scott Bair Georgia Institute of Technology, Center for High-Pressure Rheology, George W. Woodruff School of Mechanical Engineering, Atlanta, GA 30332-0405, USA
  • Paul Michael Corresponding author: Fluid Power Institute, Milwaukee School of Engineering, 1025 N. Broadway, Milwaukee, WI, 53202-3109, USA

Keywords:

hydraulics, elastohydrodynamics, rheology, high-pressure, viscosity, equation of state

Abstract

Viscosity and compressibility have a major impact upon the efficiency and dynamic response of fluid power systems. The viscosity and compressibility of five hydraulic fluids have been measured for temperatures to 150 ºC and pressures to 350 MPa. A new correlation of viscosity with temperature and pressure based on the thermodynamic scaling rule of Roland et al. is offered. This correlation provides a means to model elastohydrodynamic effects in fluid power components and extends the accuracy of fluid power system models to higher pressure. The role of phase change and the resulting thixotropy in mineral based fluids is experimentally investigated.

Downloads

Download data is not yet available.

Author Biographies

Scott Bair, Georgia Institute of Technology, Center for High-Pressure Rheology, George W. Woodruff School of Mechanical Engineering, Atlanta, GA 30332-0405, USA

Scott Bair Principal Research Engineer at the Center for High Pressure Rheology in the George W. Woodruff School of Mechanical Engineering at Georgia Institute of Technology. He has authored or coauthored more than 130 technical papers and has been issued eleven patents. He is a fellow of ASME and STLE and he has twice received the best paper award from ASME, Tribology Division and twice received the Alfred Hunt award from STLE for best paper and also the STLE International Award. He has recently received the title of Regents’ Researcher for Georgia Tech.

Paul Michael, Corresponding author: Fluid Power Institute, Milwaukee School of Engineering, 1025 N. Broadway, Milwaukee, WI, 53202-3109, USA

Paul Michael Born in Boston, MA 1960. He received his BS in Chemistry at from the University of Wisconsin, Milwaukee in 1987 and his MBA from Keller Graduate School in 1999. At present he is a research chemist in the Fluid Power Institute at Milwaukee School of Engineering. His research interests include energy efficient hydraulic fluids, wear particle analysis and fluid compatibility

References

Angell, C. A. 1995. Formation of Glasses from Liquids

and Biopolymers. Science, Vol.276, pp. 1924-1935.

Bair, S. 2007. High Pressure Rheology for Quantitative

Elastohydrodynamics. Elsevier Science, Amsterdam,

pp. 80-86, 107-113, 60-61.

Bair, S., Liu, Y. and Wang, Q. J. 2006. The Pressure-

Viscosity Coefficient for Newtonian EHL Film

Thickness with General Piezoviscous Response.

ASME, J. Tribology, Vol. 123, No. 3, pp. 624-631.

Barus, C. 1893. Isothermals, Isopiestics and Isometrics

Relative to Viscosity. American Journal Science,

Third Series, Vol. XLV, No.266, 1893, pp. 87-96.

Casalini, R. and Roland, C. M. 2007. An Equation for

the Description of the Volume and Temperature

Dependences of the Dynamics of Supercooled Liquids

and Polymer Melts. J. Non-Cryst. Solids, Vol.

, pp. 3936-3939.

Dowson, D. and Higginson, G. R. 1977.

Elastohydrodynamic Lubrication. 2nd Ed.

Pergamon Press, Oxford.

Harris T. A. 1991, Contact Bearing Analysis. John

Wiley and Sons, Hoboken.

Herzog, S. and Michael, P. 2010. Hydraulic Fluid

Viscosity Selection for Improved Fuel Economy.

Proceedings of the 7th International Fluid Power

Conference, Aachen, Germany, Vol. 2, pp. 167-178

Ivantysynova, M. and Ivanstysyn J., 2003.

Hydrostatic Pumps and Motors. Tech Books

International, New Dehli.

Jakobsen, J., Sanborn, D. M. and Winer, W. O.

Pressure Viscosity Characteristics of a Series

of Siloxane Fluids. ASME J. Lubrication Technology,

Vol. 96, pp. 410-417.

Johari, G. P. and Whalley, E. 1972. Dielectric Properties

of Glycerol in the Range 0.1-105 Hz, 218-357K,

-53kb. Faraday Symp. of Chem. Soc., No.6, pp.

-41.Liu, Y., Wang, Q. J., Bair, S. and Vergne, P. 2007. A

Quantitative Solution for the Full Shear-Thinning

EHL Point Contact Problem including Traction.

Tribology Letters, Vol. 28, No. 2, pp. 171-181.

Lumkes, J. H. 2002. Control Strategies for Dynamic

Systems. Marcel Dekker, NY.

Manring, N. D. 2005. Hydraulic Control Systems.

John Wiley & Sons, Hoboken. pp. 35-37.

Michael, P., Burgess, K., Kimball, A., and Wanke, T.

Hydraulic Fluid Efficiency Studies in Low-

Speed High-Torque Motors. SAE Commercial Vehicle

Conference, Chicago, paper 2009-01-2848.

Ohno,N., Kuwano, N. and Hirano, F. 1988. Observation

of Mechanical Behaviour of Solidified Oils Using

Photoelastic Method. J. Japanese Soc. Lubr.

Engrs., Vol. 33, No.9, pp. 693-699.

Roelands, C. J. A. 1966. Correlational Aspects of the

Viscosity-Temperature-Pressure Relationship of

Lubricating Oils, Ph.D. Thesis, University of Technology,

Delft, p. 108.

Roland, C. M., Bair, S. and Casalini, R. 2006. Thermodynamic

Scaling of the Viscosity of van der

Waals, H-Bonded, and Ionic Liquids. J. Chem.

Phys. Vol. 125, pp. 124508-1 -12508-8.

Stickel, F., Fischer, E.W. and Richert, R. 1996. Dynamics

of Glass-Forming Liquids. II. Detailed

Comparison of Dielectric Relaxation, DCConductivity,

and Viscosity Data. J. Chem. Phys.,

Vol.104, No.5, pp. 2043-2055.

Downloads

Published

2010-08-01

How to Cite

Bair, S., & Michael, P. (2010). MODELLING THE PRESSURE AND TEMPERATURE DEPENDENCE OF VISCOSITY AND VOLUME FOR HYDRAULIC FLUIDS. International Journal of Fluid Power, 11(2), 37–42. Retrieved from https://journals.riverpublishers.com/index.php/IJFP/article/view/483

Issue

2010: Vol 11 Iss 2

Section

Original Article