LAUSR

Measurements of viscosity and density of three lubricating oils (two synthetic and one mineral) were performed. The density of these lubricants was measured at atmospheric pressure by means of a density measuring cell which works on the proven principle of the oscillating tube. Using the same device, the viscosity of these lubricants was measured at 0.1 MPa by using a rotational viscometer. The volumetric behavior of the tested lubricants at high pressure is also reported. Density was measured from 278.15 to 398.15 K up to 120 MPa with a high pressure vibrating tube densimeter. The isobaric thermal expansivity and the isothermal compressibility were determined with a Tammann–Tait equation. A falling body viscometer was used to determine the viscosity behavior at high pressure from 303.15 to 353.15 K up to 150 MPa. From the experimental data obtained in these measurements, the film pressure–viscosity coefficient of these lubricants was calculated and their ability to generate a lubricant film in rolling co...