Measurements and Entropy Scaling of the Viscosity of 1-Octanol at Pressures up to 600 MPa

Abstract

The viscosity of 1-octanol was determined experimentally and modeled using both empirical as well as physical models. The viscosity of liquid 1-octanol was measured using a falling-body viscometer at pressures up to 600 MPa and temperatures between 293.15 K and 373.15 K. For the physics-based modeling, entropy scaling in combination with a molecular-based equation of state, namely SAFT-VR Mie, was used. Also for the evaluation of the viscosity measurements, the SAFT-VR Mie EOS was used for describing the density of the fluid. The new viscosity data significantly extend the available literature data. For the new experimental data, the relative expanded uncertainty is below 10% for most data points. Moreover, an empirical model was developed to represent experimental data from this work. Finally, the entropy scaling model was employed and tested for describing the viscosity of 1-octanol in a wide range of states including gaseous, liquid, supercritical, and metastable states. It describes all available experimental data well and is robust when used for extrapolations.