Two commercial base stocks are evaluated using a controlled stress rheometer, a cold cranking simulator and a scanning Brookfield viscometer. These oils form wax structures below 0°C that significantly influence viscosity. These structures break down with time under shear. This degradation process depends on the magnitude and duration of applied stress. A constant stress causes a continuous decrease in viscosity even after an hour of shear. Viscosity approaches a limiting value if the imposed shear stress increases at a constant rate. Repetitions of this test lead to a lower viscosity that is relatively insensitive to shear rate over the range of applied stress. In all cases, the wax structure does not readily reform after degradation for oils held at the test temperature. These results are used to suggest the domain of current procedures and their relation to higher temperature measurements.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Low Temperature Rheology of Commercial Base Stocks


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    International Fuels & Lubricants Meeting & Exposition ; 1993



    Erscheinungsdatum :

    01.10.1993




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    Low temperature rheology of commercial base stocks

    Ravulapalli,N.B. / VanArsdale,W.E. / Univ.of Houston,US | Kraftfahrwesen | 1993


    Hydrotreated Lube Oil Base Stocks

    Cashmore, K. / Movie, M. / Sullivan, P. J. | SAE Technical Papers | 1982


    Hydrotreated Lube Oil Base Stocks

    Cashmore,K. / Moyle,M. / Sullivan,P.J. et al. | Kraftfahrwesen | 1982


    Low-Temperature Performance Advantages for Oils Using Hydrodewaxed Base Stocks

    Rowe, C. N. / Murphy, J. A. | SAE Technical Papers | 1983


    Low-Temperature Performance Advantages for Oils Using Hydrodewaxed Base Stocks

    Rowe,C.N. / Murphy,J.A. / Mobil,US | Kraftfahrwesen | 1983