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RISA Universal Mixing Rule for the High-Pressure Viscosity of Oil/Refrigerant Mixtures
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Bearing life analysis for the rolling element bearings in refrigeration compressors requires an accurate estimate of the film thickness. An alternative is offered here to the experimentally challenging pressure–viscosity ...
Time Temperature Pressure Superposition in Polymer Thickened Liquid Lubricants
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Sheardependent viscosities have been measured over a range of temperature and pressure for seven engine oils blended to have kinematic viscosity of 14 mm2/s at 100 آ°C with two base oils and four viscosity modifiers. ...
Your EHD Rig May Not Be As Elastohydrodynamic As You Think
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The concentrated contact formed between a steel ball and a glass disc—the optical elastohydrodynamic lubrication (EHD) rig—has been the primary instrument for experimental investigations of elastohydrodynamic film thickness. ...
Erratum: “Revisiting the ASME Pressure–Viscosity Report Using the Tait-Doolittle Correlations” [ASME J. Tribol., 2021, 143(6), p. 061901DOI: 10.1115/1.4048605]
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Table 3 should be corrected as shown below to list a reference temperature of 311 K which was used throughout the Zolper et al. [1] manuscript. The fit parameters in the table are unchanged.The authors originally used ...
Elastohydrodynamic Lubrication Traction Coefficient is Not a Property of the Liquid Alone
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The slow progress in the prediction of elastohydrodynamic film thickness and friction may be attributed to the mistaken notion that a traction curve is equivalent to a rheological flow curve. A similar concept is being ...
Quantitative Elastohydrodynamic Lubrication—Seventeen Years In
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Seventeen years have passed since the first full elastohydrodynamic lubrication (EHL) simulation employed the real pressure and shear dependence of viscosity measured in viscometers to accurately predict film thickness and ...
The Viscosity of Polyalphaolefins Mixtures at High Pressure and Stress
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Understanding the pressure and shear dependence of viscosity is essential to an understanding of the mechanisms of film forming and friction in concentrated contacts. The blending of different molecular mass polyalphaolefins ...
Revisiting the Compressibility of Oil/Refrigerant Lubricants
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A fixture was fabricated for the purpose of restraining the expansion of an existing metal bellows piezometer so that a refrigerant and oil mixture can be admitted under pressure. Measurements on a polyol ester (POE) with ...
Quantitative Elastohydrodynamic Film-Forming for an Oil/Refrigerant System
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The first calculations of film thickness for an oil/refrigerant system using quantitative elastohydrodynamics are reported in this work. It is demonstrated that primary measurements of the properties of the oil/refrigerant ...