RE: The Calculation of Viscosity Blending Indices Using the Refutas Equation jmw (Industrial) 2 Oct 07 05:54 but I am only interested in the above equation. I know that there are many other charts, tables, nomograms and equations for calculating Viscosity Blending Indices. Does the equation require the use of the log to the base 10 or the natural log to the base e? Not a single one of the publications I read clearly states whether log base 10 or log base e is required.Ĭan anyone tell me which log to use and provide me with a reference that clearly and definitively verifies it.
Seeing the equation published in the literature in both of the above forms leaves me confused.
The following equation for calculating the Viscosity Blending Index (VBI) of heavy oils is often referred to as the Refutas method and I have seen it published in the technical literature in both of the forms below:
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