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    Temporary Viscosity Loss and its Relationship to Journal Bearing Performance

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    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.

    Author Information:

    McMillan, Michael L.
    General Motors Research Labs,

    Murphy, Chester K.
    General Motors Research Labs,

    Committee/Subcommittee: D02.B0

    DOI: 10.1520/STP46077S