I am currently trying to find the Impeller Reynolds number in a 1000 gallon industrial mixer which has 3 mixing blades: an auger, a shear, and perimeter blade. This calculation requires a viscosity value (equation below). The fluids I work with show high levels of shear thinning, therefore making it hard to find a viscosity value. What would be the best way to identify this viscosity value? I have access to an older Brookfield Rheometer but I do not believe I can replicate the shear from the industrial mixers.

Impeller Reynolds number = (n*D^2*s.g.)/viscosity

where

n: rpm

D: diameter

s.g: standard gravity

Thanks for any future help!