Density Scaling of the Thermal Conductivity of a Jet Oil

作者：Bair Scott^*

来源：Tribology Transactions, 2014, 57(4): 647-652.

DOI：10.1080/10402004.2014.898353

• Thermal Properties
• High Pressure
• Elastohydrodynamics
• Liquid Lubricants

The application of the new quantitative elastohydrodynamics, which employs real properties of the liquid lubricant, to practical tribology problems obviously requires property measurements at high pressure to parameterize the correlations. The thermal conductivity under elevated pressure has been shown to be essential for nonisothermal situations. A new transient hot-wire instrument for pressure to 600 MPa is described and validated. New measurements are presented of the temperature- and pressure-dependent thermal conductivity of a synthetic oil for jet aircraft engines. The density scaling law, , with exponent approximately equal to the standard value of 3 gives an excellent accounting of the results. The temperature dependence of the conductivity may be ignored in elastohydrodynamic lubrication (EHL) simulations without great loss of accuracy and it may be sufficient to describe the pressure dependence with a general expression, .

• 出版日期2014-7-4