To determine the correlation between journal bearing performance and viscosity loss in a capillary, viscosities of eleven base oil-polymer blends were measured in a high-shear, pressurized capillary viscometer (High-Shear Capillary Viscometer, HSCV) at shear rates from 100 to nearly 1 000 000 s-1. Although low-shear kinematic viscosities do not predict bearing performance differences found by Rosenberg with the same oil blends, HSCV viscosities at shear rates near 500 000 s-1 correlate well with the bearing performance data. Differences among polymers are strongly related to molecular weight.To determine the correlation between journal bearing performance and viscosity loss in a capillary, viscosities of eleven base oil-polymer blends were measured in a high-shear, pressurized capillary viscometer (High-Shear Capillary Viscometer, HSCV) at shear rates from 100 to nearly 1 000 000 s-1. Although low-shear kinematic viscosities do not predict bearing performance differences found by Rosenberg with the same oil blends, HSCV viscosities at shear rates near 500 000 s-1 correlate well with the bearing performance data. Differences among polymers are strongly related to molecular weight.
Temporary Viscosity Loss and Its Relationship to Journal Bearing Performance
Sae Technical Papers
1978 Automotive Engineering Congress and Exposition ; 1978
1978-02-01
Conference paper
English
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