http://www.savantgroup.com/media/SAE-High-Shear-Rate-Rheology-of-Lower-Viscosity-SanDiego2010.pdf
Some of you are probably aware that I'm in search of a "high shear" Viscosity Index.
Here's a paper (again by Selby), and available for download on the Savant website, exploring high shear rate viscosities of some of the lighter engine oils at temperatures ranging from 80C to 150C.
Interesting commentary in the first couple of paras...leave it to the reader to pick which ones.
Fig 12 is useful too, for those that state that the "150" in the HTHS is meaningless to operating engines, and it also shows the contribution (and temperatures) of various frictional locations to total engine friction. (hint, oil pump is less than 3% of lubricant friction power loss (heat generation)).
As to High Shear Viscossity Index, there's the MWW interpolation (MacCoul, Walther, and Write)...lnln of High Shear Viscosity Versus LN of temp in kelvins
Some of you are probably aware that I'm in search of a "high shear" Viscosity Index.
Here's a paper (again by Selby), and available for download on the Savant website, exploring high shear rate viscosities of some of the lighter engine oils at temperatures ranging from 80C to 150C.
Interesting commentary in the first couple of paras...leave it to the reader to pick which ones.
Fig 12 is useful too, for those that state that the "150" in the HTHS is meaningless to operating engines, and it also shows the contribution (and temperatures) of various frictional locations to total engine friction. (hint, oil pump is less than 3% of lubricant friction power loss (heat generation)).
As to High Shear Viscossity Index, there's the MWW interpolation (MacCoul, Walther, and Write)...lnln of High Shear Viscosity Versus LN of temp in kelvins