![]() Once the value of K is known, the viscosity can be determined by measuring the amount of time the test liquid flows between the two graduated marks. 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: VBI 14.534 × lnln(v + 0.8) + 10.975 VBI 14.534 × loglog(v + 0.8) + 10. One such viscosity index calculator is available at: https. Just as an example, to calculate viscosity index we can use online viscosity index calculator or excel tools. Common methods for viscosity index calculations are ASTM D2270 and ISO 2909. Where \(K\) is the value of a liquid with known viscosity and density such as water. A: The viscosity index of a fluid (usually oil) is calculated from its viscosity at 40 and 100C. A new viscositytemperature equation and corresponding chart have been developed to extend the range of the current ASTM viscositytemperature charts. ![]()
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