Question

find the viscosity index of a fluid that has a viscosity of 32 cst at 40 degrees c. the 0 vi and 100 vi reference fluids have viscosities of 110 and 50 cst respectively, at 40 degrees c.

Answer 1

The viscosity index of the fluid can be calculated by taking the ratio of the viscosity of the fluid at 40 degrees to the viscosity of the 0 V.I. reference fluid (110 cst) at 40 degrees and multiplying it by the V.I. of the reference fluid (0). The result is (32 / 110) * 0 = 0.29, so the viscosity index of the fluid is 0.29.