Where w is the weight fraction (i.e., weight % ÷ 100) of each component of the blend. The next step is to calculate the VBN of the blend, using this equation:
It is important that the viscosity of each component of the blend be obtained at the same temperature. Where v is the viscosity in square millimeters per second (mm²/s) or centistokes (cSt) and ln is the natural logarithm (log e).
The first step is to calculate the Viscosity Blending Index (VBI) of each component of the liquid blend using the following equation: Liquid viscosity blending calculations to determine the viscosity of a blend of two or more liquids having different viscosities are best performed by using what is known as the Refutas equation in a three-step procedure.
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