In this study, both theoretical and empirical viscosity models were evaluated for binary associating liquid mixtures of water+ 1,2-ethanediol, 1,3-propanediol, 1,4-butanediol, and 1,5-pentanediol. The interaction between molecules in the mixtureswas analyzed using the calculation of excess energy of flowobtained from Eyring's absolute rate theory. Free volume (FV) viscosity modelwas coupledwith Peng-Robinson (PR) and perturbed-chain statistical associating fluid theory (PC-SAFT) equation of states (EoS); friction theory (FT) was coupled with PR EoS; no significant difference was observed in the modeling results using different EoS. A new mixing rule was found to improve themodeling results of FT coupledwith the PR EoS for the binary mixtures studied. The empiricalmodels correlated viscosity of aqueous diol systemswellwith average absolute percent deviation (AAD%) b1. © 2017 Elsevier B.V. All rights reserved
