The viscosity of engine lubricants was measured at multiple shear rates by a unique Scanning Brookfield apparatus. These oils included both Pumpability Reference Oils (PRO) and a selection of today's commercial multigrade oils. It was found that the viscosity of “flow-limited” oils remained constant when the shear rate decreased. Oils with “air-binding” properties exhibited an increase in viscosity with decreasing shear rate. The magnitude of a change in “slope of the temperature/viscosity profile was found to suggest the degree of air-binding character of an oil.The flow characteristics of PRO 1, 3, 9, 11, and 16 were measured at several shear stresses and temperatures in the Mini-Rotary Viscometer. The Scanning Brookfield technique and the Mini-Rotary Viscometer were found to yield similar results when the shear stress of the Mini-Rotary Viscometer was reduced from 525 to 35 Pascals.


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    Titel :

    The Effect of Shear Rate and Shear Stress on Viscosity Determinations at Low Temperatures for Engine Oils


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    International Fuels & Lubricants Meeting & Exposition ; 1990



    Erscheinungsdatum :

    1990-10-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    The effect of shear rate and shear stress on viskosity determinations at low temperatures for engine oils

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    High Shear Rate Viscosity of Engine Oils

    Carey, L. R. / Hewson, W. D. | SAE Technical Papers | 1980


    Prediction of viscosity-shear properties for viscosity index improved crankcase oils

    Klaus,E.E. / Duda,J.L. / Bala,V. et al. | Kraftfahrwesen | 1994


    Experimental Study on Viscosity-Shear Characteristics of Lubricating Oils

    Okamura, Hiromasa / Fukuchi, Hisashi / Mitsui, Jun'ichi et al. | SAE Technical Papers | 1995


    Experimental study on viscosity-shear characteristics of lubricating oils

    Suzuki,Y. / Mitsui,J. / Shiomi,M. et al. | Kraftfahrwesen | 1995