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Homework Help: Coefficient of Viscosity

  1. Sep 9, 2012 #1
    How do I tell what the coefficient of viscosity is of SAE 10W-30 oil? It is at 25 degrees C. My book says that multigrade oils like this have a non newtonian blending additive. This doesn't mean I have to treat the substance as non newtonian does it?

    Any help would be appreciated.
     
  2. jcsd
  3. Sep 10, 2012 #2

    CWatters

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    Google found this chart but I don't know the source of the data..

    M1vsAmsoil.jpg
     
  4. Sep 10, 2012 #3

    CWatters

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    Looks like the viscosity is only specified at a few temperature points and those can vary depending on the grade. Scroll down...

    http://www.tribology-abc.com/abc/viscosity.htm
     
  5. Sep 10, 2012 #4

    CWatters

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    I suspect it depends on what experiment you have planned. Presumably the additive makes the oil thicker when under pressure in bearings etc, while at the same time makes it easy to pump around the engine.

    If you are doing simple lab experiments dropping balls into oils or something then you might be ok. If you are doing something more exotic beware...

    http://en.wikipedia.org/wiki/Motor_oil

     
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