Measurement Methodology of Low-Shear Viscosity of Reference Liquid Under High-Pressure

2016 ◽  
pp. 139-143
Author(s):  
S. Hornak
Keyword(s):  
High Pressure ◽  
Shear Viscosity ◽  
Measurement Methodology ◽  
Low Shear Viscosity ◽  
Low Shear ◽  
Reference Liquid

The Viscosity of Polyalphaolefins Mixtures at High Pressure and Stress

2018 ◽  
Vol 141 (2) ◽  
Author(s):  
Scott Bair ◽  
Samuel Flores-Torres
Keyword(s):  
High Pressure ◽  
Shear Stress ◽  
Film Thickness ◽  
Shear Viscosity ◽  
Mixing Rule ◽  
Base Oils ◽  
Film Forming ◽  
Low Shear Viscosity ◽  
Temperature And Pressure ◽  
Low Shear

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 (PAOs) may permit the formulator to arrive at a desired combination of film thickness and friction. The viscosities of PAO base oils and their blends were measured versus temperature, pressure, and shear stress to 1 GPa in pressure. The Grunberg–Nissan mixing rule, with effective mole fractions, provides an excellent mixing rule for the temperature and pressure-dependent low-shear viscosity. This work provides the first look at a possible mixing rule for the non-Newtonian response of mixtures of base oils.

Low shear viscosity of polypropylene melts

1963 ◽  
Vol 1 (7) ◽  
pp. 381-384 ◽  
Author(s):  
D. Poller ◽  
A. M. Kotliar ◽  
R. L. Kruse
Keyword(s):  
Shear Viscosity ◽  
Low Shear Viscosity ◽  
Low Shear

Dispersion and Rheological Properties of Alumina Freeze Casting Slurries Containing Nanoparticle/Whisker SiC

2007 ◽  
Vol 280-283 ◽  
pp. 1035-1038 ◽  
Author(s):  
Tae Young Yang ◽  
Young Min Park ◽  
Gun Dae Lee ◽  
Seog Young Yoon ◽  
Ron Stevens ◽  
...  
Keyword(s):  
Shear Rate ◽  
Shear Viscosity ◽  
Pure Alumina ◽  
Rheological Measurements ◽  
Continuous Shear ◽  
Suspension Viscosity ◽  
Low Shear Viscosity ◽  
Opposite Manner ◽  
High Structure ◽  
Low Shear

The sedimentation density significantly decreased after addition of dispersant; the effect was more pronounced with pure alumina, as compared with SiC-containing slurry. With further addition of surfactant, the sedimentation density increased somewhat, but decreased with binderadditions. The suspension viscosity generally behaved in an opposite manner to the sedimentation density, i.e., low sedimentation density gave high low-shear viscosity, indicative of high structure formation in the suspended particles. Shear rate rheological measurements showed continuous shear thinning behavior.

The Measurement of Viscosity of Liquids Under Tension

2003 ◽  
Vol 125 (2) ◽  
pp. 260-266 ◽  
Author(s):  
Peter A. Kottke ◽  
Scott S. Bair ◽  
Ward O. Winer
Keyword(s):  
Shear Viscosity ◽  
Initial Pressure ◽  
Viscosity Coefficient ◽  
Absolute Zero ◽  
Viscosity Data ◽  
Hydrostatic Tension ◽  
Low Shear Viscosity ◽  
Low Shear

The rheological significance of a state of hydrostatic tension was investigated. A method for measuring the limiting low shear viscosity of liquids under tension was developed. The ability of nine liquids to withstand tension was verified, and the magnitudes of tension achievable through different methods were compared. The use of viscosity data from liquids under tension to more accurately determine the initial pressure viscosity coefficient was investigated. The continuity of the pressure viscosity coefficient across absolute zero pressure was verified.

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