Understanding Coefficient of Viscosity for SAE 10W-30 Oil at 25°C

[jabers]

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.

 

[CWatters]

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

 

[CWatters]

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

 

[CWatters]

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.

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

Quote from ASTM report on the matter: "The rapid growth of non-Newtonian multigraded oils has rendered kinematic viscosity as a nearly useless parameter for characterising "real" viscosity in critical zones of an engine.

 

[rezeew]

The coefficient of viscosity for SAE 10W-30 oil at 25°C can be determined by conducting a viscosity test using a viscometer. This test measures the resistance of the oil to flow and provides a numerical value for the coefficient of viscosity. It is important to note that the coefficient of viscosity may vary for different temperatures, so it is important to specify the temperature at which the measurement was taken.

The fact that SAE 10W-30 oil is a multigrade oil does not necessarily mean that it behaves as a non-Newtonian fluid. Non-Newtonian fluids have a varying viscosity depending on the applied stress, while multigrade oils have a constant viscosity at different temperatures. However, it is possible that the oil contains non-Newtonian additives to improve its performance, which may affect its behavior under certain conditions.

In conclusion, to determine the coefficient of viscosity of SAE 10W-30 oil at 25°C, a viscosity test should be conducted. It is also important to consider the potential presence of non-Newtonian additives in the oil, which may affect its behavior in certain situations.