The degree of variability between theoretical and empirical nanofluid viscosity model predictions and relevant experimental data is
examined in this work. Results confirm a high degree of variability in the compared data; with some observed inconsistencies in the
model formulations and the predicted data, consequently, a range of constitutive fac-tors need to be incorporated into the models in
order to accurately predict the rheological behavior of nanofluids in different use conditions. Notably, conducting broad theoretical
studies and empirical investigations into the rheological behavior of nano-fluids incorporating the fundamental parametric variables can
plausibly lead to near-generalized models.